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RSS2000 Vol. 12, No. 01
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2000,
12.
Abstract:
The experiment and measurement of single event upset of two types of SRAM is reported using heavy ion provided by 2×6MV tandem-accelerator of Beijing university.The SEU cross-sections of SRAMs vs linear energytransfer(LET) of ions are given.
The experiment and measurement of single event upset of two types of SRAM is reported using heavy ion provided by 2×6MV tandem-accelerator of Beijing university.The SEU cross-sections of SRAMs vs linear energytransfer(LET) of ions are given.
2000,
12.
Abstract:
An accelerating tube is an electrostatic lens system. This paper has deduced the ion trajectory in an accelerating tube by integrating the one in a unit electrostatic lens. The results show that tube focusing effect on ion trajectory is greatly affected by ion incident angle and the electrode dimension but almost independent of the number of the electrodes.
An accelerating tube is an electrostatic lens system. This paper has deduced the ion trajectory in an accelerating tube by integrating the one in a unit electrostatic lens. The results show that tube focusing effect on ion trajectory is greatly affected by ion incident angle and the electrode dimension but almost independent of the number of the electrodes.
2000,
12.
Abstract:
This paper describes the design and construction of the production and transmission system of electron beams for "Heaven-I" preamplifier. To obtain lower voltage (400KV) and higher current density (143A× cm-2) for the optical aperture (f 12cm) and required laser output energy (40J) the diode feed bushing, electrode form, length of drift space, Hibachi open area, etc. are considered. The experiment results are given and the influence of the Marx voltage start time on electron beams energies is discussed for the fixed switch trigger time.
This paper describes the design and construction of the production and transmission system of electron beams for "Heaven-I" preamplifier. To obtain lower voltage (400KV) and higher current density (143A× cm-2) for the optical aperture (f 12cm) and required laser output energy (40J) the diode feed bushing, electrode form, length of drift space, Hibachi open area, etc. are considered. The experiment results are given and the influence of the Marx voltage start time on electron beams energies is discussed for the fixed switch trigger time.
2000,
12.
Abstract:
With the equivalent RLC circuit, the self-inductance of the inductive coupler and the mutual inductance with the cavity of the buncher B1 as a function of the cavity parameters were derived. From the derived equations the required range of the mutual inductance can be determined and a movable coupler has been designed to cover the working frequency range of the buncher properly. The residual inductor and the tuning curve with the coupler are also given.
With the equivalent RLC circuit, the self-inductance of the inductive coupler and the mutual inductance with the cavity of the buncher B1 as a function of the cavity parameters were derived. From the derived equations the required range of the mutual inductance can be determined and a movable coupler has been designed to cover the working frequency range of the buncher properly. The residual inductor and the tuning curve with the coupler are also given.
2000,
12.
Abstract:
A constant current high voltage power supply is described, which is used to charging the capacitor banks quickly and efficiently in pulse power technology. The three-phase alternating current is rectified with the half-controlled bridge mode of Silicon Controlled Rectifier(SCR), then, is imported into the constant current network consisted of two SCR, storage energy inductance, continuous current diode and Hall sensor, thirdly is changed inversely into 1kHz A.C by the self-controlled SCR bridge circuit, finally, is put into a step-up transformer and rectified by SCR.
A constant current high voltage power supply is described, which is used to charging the capacitor banks quickly and efficiently in pulse power technology. The three-phase alternating current is rectified with the half-controlled bridge mode of Silicon Controlled Rectifier(SCR), then, is imported into the constant current network consisted of two SCR, storage energy inductance, continuous current diode and Hall sensor, thirdly is changed inversely into 1kHz A.C by the self-controlled SCR bridge circuit, finally, is put into a step-up transformer and rectified by SCR.
2000,
12.
Abstract:
A repetitive pulsed intense X-ray source operating in 1～2Hz is described briefly. It is utilized the technology of repetitive plasma opening switch(RPOS) and Inductance Energy Storage. After RPOS opening swiftly, a high-voltage pulse reaching ～3MV is imposed on the bremsstrahlung radiating source diode and produced a intense X-ray pulse. The X-ray pulse parameters as following : peak dose-rate is 0.25MGy/s at 0.5m , average dose-rate is 0.15kGy/h at 1m, Full Width of Half Magnitude (FWHM) is ～100ns. The configuration, priciple and preliminary results are given in this paper.
A repetitive pulsed intense X-ray source operating in 1～2Hz is described briefly. It is utilized the technology of repetitive plasma opening switch(RPOS) and Inductance Energy Storage. After RPOS opening swiftly, a high-voltage pulse reaching ～3MV is imposed on the bremsstrahlung radiating source diode and produced a intense X-ray pulse. The X-ray pulse parameters as following : peak dose-rate is 0.25MGy/s at 0.5m , average dose-rate is 0.15kGy/h at 1m, Full Width of Half Magnitude (FWHM) is ～100ns. The configuration, priciple and preliminary results are given in this paper.
2000,
12.
Abstract:
A compact capacitive divider with 2.8ns of response time which is used to measure high voltage pulse,is built.It have been applied to measure high voltage pulse and resonant waves of Tesla-transformer-type electron beam accelerator.
A compact capacitive divider with 2.8ns of response time which is used to measure high voltage pulse,is built.It have been applied to measure high voltage pulse and resonant waves of Tesla-transformer-type electron beam accelerator.
2000,
12.
Abstract:
Intrapulse quenching of a hydrogen thyratron could be explained with several theoretical methanisms from different viewpoint. It sets a definite on the pulse width and the current of thratron, and results in instable operation. It has been observed that there different phenomena of the quenching for different conditions. Under normal operation conditions, the ignition delay and jitter will gradually increase in course of its operation, at the sama time the positive remaining voltage on the PFN will appear evidently and instably without increased reservoir voltage if a positive mismatch ia established. While hydrogen pressure reduces beyond a certain limit, the pulse missing named pulse to pulse quenching will occur and operation will be very instable. Some oscillograms are given.
Intrapulse quenching of a hydrogen thyratron could be explained with several theoretical methanisms from different viewpoint. It sets a definite on the pulse width and the current of thratron, and results in instable operation. It has been observed that there different phenomena of the quenching for different conditions. Under normal operation conditions, the ignition delay and jitter will gradually increase in course of its operation, at the sama time the positive remaining voltage on the PFN will appear evidently and instably without increased reservoir voltage if a positive mismatch ia established. While hydrogen pressure reduces beyond a certain limit, the pulse missing named pulse to pulse quenching will occur and operation will be very instable. Some oscillograms are given.
2000,
12.
Abstract:
Laser-produced line plasmas were used as a broadband source of soft X-rays and a stigmatic grazing incidence grating spectrometer to measure the normal incidence reflectance of concave multilayer mirrors in the 20 ~ 40 nm spectral region. The measurements of the reflectance made on a C/Al multilayer show a little lower than the calculated results and indicate a normal incidence peak reflectance of about 22% at 28.5 nm.
Laser-produced line plasmas were used as a broadband source of soft X-rays and a stigmatic grazing incidence grating spectrometer to measure the normal incidence reflectance of concave multilayer mirrors in the 20 ~ 40 nm spectral region. The measurements of the reflectance made on a C/Al multilayer show a little lower than the calculated results and indicate a normal incidence peak reflectance of about 22% at 28.5 nm.
2000,
12.
Abstract:
At the “Xingguang II” facility under the condition of single-beam laser slanting incidence into a half-cavity target, the energy injection efficiencies for the half-cavity target and the hole target have been measured through a new experimental method. Closure velocities of injection hole under the condition of laser slanting incidence have been estimated. The experimental results show that under the same conditions the laser energy injection efficiencies for half-cavity targets are 10 percent lower than those for hole targets.
At the “Xingguang II” facility under the condition of single-beam laser slanting incidence into a half-cavity target, the energy injection efficiencies for the half-cavity target and the hole target have been measured through a new experimental method. Closure velocities of injection hole under the condition of laser slanting incidence have been estimated. The experimental results show that under the same conditions the laser energy injection efficiencies for half-cavity targets are 10 percent lower than those for hole targets.
2000,
12.
Abstract:
A large aperture random phase plate (RPP) for target-plane laser beam smoothing at 1.06m m wavelength was fabricated, by using large aperture exposure and dilute HF etching processes. The RPP’s clear aperture is f 250mm. The measured average step height is 1.060m m at 5 locations on the RPP, which has a relative deviation of 1.24% to the theoretical value. A focal spot with very sharp edges and nearly flat-top overall envelop intensity distribution was obtained at the focal-plane of a focusing lens. These results show the fabrication techniques for RPP is effective, and is easily scalable to even larger apertures.
A large aperture random phase plate (RPP) for target-plane laser beam smoothing at 1.06m m wavelength was fabricated, by using large aperture exposure and dilute HF etching processes. The RPP’s clear aperture is f 250mm. The measured average step height is 1.060m m at 5 locations on the RPP, which has a relative deviation of 1.24% to the theoretical value. A focal spot with very sharp edges and nearly flat-top overall envelop intensity distribution was obtained at the focal-plane of a focusing lens. These results show the fabrication techniques for RPP is effective, and is easily scalable to even larger apertures.
2000,
12.
Abstract:
A new algorithm is presented for the design of thin-film plate polarizer with symmetrical multilayer in this paper. The film designed with this algorithm has broad-band and high polarization ratio. The design is flexible and the film can be prepared easily.
A new algorithm is presented for the design of thin-film plate polarizer with symmetrical multilayer in this paper. The film designed with this algorithm has broad-band and high polarization ratio. The design is flexible and the film can be prepared easily.
2000,
12.
Abstract:
A broadband Ross filter spectrometer is described for measuring soft X-ray radiation (0.1~1.5keV) emitted from laser plasma. It consists of a number of channels, each representing a Ross filter pair in conjunction with Al cathode X-ray diodes. An optimal channel has flat response within the sensitivity band, and minimal response outside it. The effect of some uncertainties on the accuracy of measurements is calculated.
A broadband Ross filter spectrometer is described for measuring soft X-ray radiation (0.1~1.5keV) emitted from laser plasma. It consists of a number of channels, each representing a Ross filter pair in conjunction with Al cathode X-ray diodes. An optimal channel has flat response within the sensitivity band, and minimal response outside it. The effect of some uncertainties on the accuracy of measurements is calculated.
2000,
12.
Abstract:
The X-ray radiography technique for measurement of ICF targets. Record film images of microspheres using contact microradiography. Analysis the X-ray images using surface profiler, direct measuring the wall thickness of single-wall microsphere. Comparsed this measurement with the optical interferometric measurement and found measurement differences <0.3μm.
The X-ray radiography technique for measurement of ICF targets. Record film images of microspheres using contact microradiography. Analysis the X-ray images using surface profiler, direct measuring the wall thickness of single-wall microsphere. Comparsed this measurement with the optical interferometric measurement and found measurement differences <0.3μm.
2000,
12.
Abstract:
Step by step fill procedures for thin-wall hollow micro-sphere was applied. The leakage of the metal system was 3.7×10-4Pa L/s under the pressure of 15MPa. U and LaNi5 combination serve as good gas-resource，supplying high pressure. Both at the room temperature and 250℃, the shell can bear 1.0MPa and the pressure ratio of inside to outside was about 0.51. At 250℃,the pressure of D-T filled into the spheres was 0.51-0.54MPa,which satisfied the physical experiment requirement.
Step by step fill procedures for thin-wall hollow micro-sphere was applied. The leakage of the metal system was 3.7×10-4Pa L/s under the pressure of 15MPa. U and LaNi5 combination serve as good gas-resource，supplying high pressure. Both at the room temperature and 250℃, the shell can bear 1.0MPa and the pressure ratio of inside to outside was about 0.51. At 250℃,the pressure of D-T filled into the spheres was 0.51-0.54MPa,which satisfied the physical experiment requirement.
2000,
12.
Abstract:
Stimulated Brillouin Scattering(SBS) spectra are reported from different angle in plasma produced by 0.351m m laser. SBS spectra are affected by 2-D plasma. When laser irradiates disk target at 45° , backscattering is more blue shift in low Z plasma, but sidescattering are more blue shift in high Z plasma.
Stimulated Brillouin Scattering(SBS) spectra are reported from different angle in plasma produced by 0.351m m laser. SBS spectra are affected by 2-D plasma. When laser irradiates disk target at 45° , backscattering is more blue shift in low Z plasma, but sidescattering are more blue shift in high Z plasma.
2000,
12.
Abstract:
The nonlocal heat conduction for electrons is introduced into one-dimensional non-LTE radiation hydrodynamic code and usedto the simulation of 0.35m m laser-Au target coupling. The comparison of the numerical results shows that , compared to the flux-limited Spitzer-Harm formula , the simulation with taking account of nonlocal electron conductivity is more reasonable.
The nonlocal heat conduction for electrons is introduced into one-dimensional non-LTE radiation hydrodynamic code and usedto the simulation of 0.35m m laser-Au target coupling. The comparison of the numerical results shows that , compared to the flux-limited Spitzer-Harm formula , the simulation with taking account of nonlocal electron conductivity is more reasonable.
2000,
12.
Abstract:
In this paper, the numerical calculation and the design of permanent magnet were studied in detail. A relativistic magnetron with permanent magnet has been designed, fabricated and tested. An output power of 430MW in S band has been obtained in experiment.
In this paper, the numerical calculation and the design of permanent magnet were studied in detail. A relativistic magnetron with permanent magnet has been designed, fabricated and tested. An output power of 430MW in S band has been obtained in experiment.
2000,
12.
Abstract:
YAG(yttrium aluminum garnet) projection CRT which luminance for green color is more than 6.5×105cd/m2 at the beam current of 5mA and spot size is less than 80 m at the cathode current 1.0mA has been developed. A projection display in which the YAG projection CRT is employed gets a fine quality picture on the 48-in. rear projection display that horizontal resolution is more than 1000TVL, the peak brightness on the screen is 1500cd/m2 and the contrast ratio is 100.
YAG(yttrium aluminum garnet) projection CRT which luminance for green color is more than 6.5×105cd/m2 at the beam current of 5mA and spot size is less than 80 m at the cathode current 1.0mA has been developed. A projection display in which the YAG projection CRT is employed gets a fine quality picture on the 48-in. rear projection display that horizontal resolution is more than 1000TVL, the peak brightness on the screen is 1500cd/m2 and the contrast ratio is 100.
2000,
12.
Abstract:
Optimum design of an overmoded TEM coaxial to TE10 rectangular waveguide mode converter at S-band using HFSS software and network theory is presented. The coaxial waveguide has such structure parameters that the TEM,TE11 and TE21 modes can propagate in it . The mode converter can be applied to the power extraction system of HPM sources. The method presented in this paper can be used to optimize the mode converters from coaxial and circular waveguides to rectangular waveguides which are matched with short pistons.
Optimum design of an overmoded TEM coaxial to TE10 rectangular waveguide mode converter at S-band using HFSS software and network theory is presented. The coaxial waveguide has such structure parameters that the TEM,TE11 and TE21 modes can propagate in it . The mode converter can be applied to the power extraction system of HPM sources. The method presented in this paper can be used to optimize the mode converters from coaxial and circular waveguides to rectangular waveguides which are matched with short pistons.
2000,
12.
Abstract:
The method been introduced to study plasma effects on incident electromagentic fields near a conductor when surronded by ionized gas. A code has been given to examine phenomena relating to electromagnetic fields interating with a metallic surface and with the ambient atmosphere. An important result is that the plasma will affect the fields to the vicinity of the metal surface. The relevant physics is discussed and the results of a calculation are included.
The method been introduced to study plasma effects on incident electromagentic fields near a conductor when surronded by ionized gas. A code has been given to examine phenomena relating to electromagnetic fields interating with a metallic surface and with the ambient atmosphere. An important result is that the plasma will affect the fields to the vicinity of the metal surface. The relevant physics is discussed and the results of a calculation are included.
2000,
12.
Abstract:
The relativistic high harmonic of hydrogen-like atom in intense laser field has been simulated by the classical Monte Carlo method. The many results have been obtained concerning the effects of the laser parameters (frequency, pulse-shape, intensity etc.) on the relativistic high harmonics, and the results were also discussed.
The relativistic high harmonic of hydrogen-like atom in intense laser field has been simulated by the classical Monte Carlo method. The many results have been obtained concerning the effects of the laser parameters (frequency, pulse-shape, intensity etc.) on the relativistic high harmonics, and the results were also discussed.
2000,
12.
Abstract:
When scattering object is a thin wire, especially with its radius much smaller than space cell of FDTD, the combination of the method of inductance in-cell with FDTD is useful to deal with the EMP coupling to wire. In this paper we calculate the three kind of EMP(UWB、FREMP、NEMP)coupling to thin wire by it, and the induced currents in the midpoint of wires are attained.
When scattering object is a thin wire, especially with its radius much smaller than space cell of FDTD, the combination of the method of inductance in-cell with FDTD is useful to deal with the EMP coupling to wire. In this paper we calculate the three kind of EMP(UWB、FREMP、NEMP)coupling to thin wire by it, and the induced currents in the midpoint of wires are attained.
2000,
12.
Abstract:
Using second harmonic generation, fourth harmonic generation, and back Stimulated Raman scattering, ultra-violet(296nm) ultra-short(81ps) laser pulse is obtained, whose energy is 2 mJ. This system can be applied in experiments of ICF physical diagnostics.
Using second harmonic generation, fourth harmonic generation, and back Stimulated Raman scattering, ultra-violet(296nm) ultra-short(81ps) laser pulse is obtained, whose energy is 2 mJ. This system can be applied in experiments of ICF physical diagnostics.
2000,
12.
Abstract:
A real-time energy acquisition and multi-path data transportation system has been developed. With various types and apertures of calorimeters, this system, which has the capacity of peak value maintenance and power integration, can perform automatically data acquisition, processing and multi-path transportation through long distance along with its good anti-disturbance faculty. The automatization and preciseness of the laser energy measurement have technically been based on the successful development of the system.
A real-time energy acquisition and multi-path data transportation system has been developed. With various types and apertures of calorimeters, this system, which has the capacity of peak value maintenance and power integration, can perform automatically data acquisition, processing and multi-path transportation through long distance along with its good anti-disturbance faculty. The automatization and preciseness of the laser energy measurement have technically been based on the successful development of the system.
2000,
12.
Abstract:
Using the Laser diode with l = 808nm and 4W power to pump the Cr4+:Nd3+:YAG microchip, the self Q-switched laser pulses are obtained. In the case of CW pumping the output laser is pulsed with the repetition rate of 10KHz and pulse width of 40ns. In the case of pulsed pumping the output laser serial with several sub-pulses is obtained. Using a certain base current adding on the rectangular pulsed pump current the stable single pulse is obtained.
Using the Laser diode with l = 808nm and 4W power to pump the Cr4+:Nd3+:YAG microchip, the self Q-switched laser pulses are obtained. In the case of CW pumping the output laser is pulsed with the repetition rate of 10KHz and pulse width of 40ns. In the case of pulsed pumping the output laser serial with several sub-pulses is obtained. Using a certain base current adding on the rectangular pulsed pump current the stable single pulse is obtained.
2000,
12.
Abstract:
The diode laser side pumped 1kHz E-O Q-switched TEM00 mode laser was studied in this paper. The single pulse energy of laser is 0.712mJ and 10ns pulse width. Using three type cooling Nd:YAG slab in the experiment, thermal effect in diode pumped Nd:YAG slab affect laser efficiency in high repetition rates operation of laser. The results obtained in this paper are applicable to the design of high-power diode laser pumped laser system.
The diode laser side pumped 1kHz E-O Q-switched TEM00 mode laser was studied in this paper. The single pulse energy of laser is 0.712mJ and 10ns pulse width. Using three type cooling Nd:YAG slab in the experiment, thermal effect in diode pumped Nd:YAG slab affect laser efficiency in high repetition rates operation of laser. The results obtained in this paper are applicable to the design of high-power diode laser pumped laser system.
2000,
12.
Abstract:
Temperature distribution within a longitudinally-pumped and edge-cooled solid-state laser rod is obtained in the form of power series. The factors concerning with thermal beam focusing are discussed and the effective focal length of the thermal lens is derived. A longitudinally-pumped Nd:YAG rod is illustrated as an example and the results show that 10W of pump power is predicted to cause a thermal focal length in the order of millimeters.
Temperature distribution within a longitudinally-pumped and edge-cooled solid-state laser rod is obtained in the form of power series. The factors concerning with thermal beam focusing are discussed and the effective focal length of the thermal lens is derived. A longitudinally-pumped Nd:YAG rod is illustrated as an example and the results show that 10W of pump power is predicted to cause a thermal focal length in the order of millimeters.
2000,
12.
Abstract:
In the adaptive optical system, the gradient measuring error of Hartmann-Shack wave-front sensor is one of the main error sources affecting wave-front reconstruction precision. In this paper, the universality error transfer coefficient expression of modal wave-front reconstruction has been derived. Make use of the gradient data measured with Hartmann-Shack wave-front sensor in 61-element adaptive optical system, the correctness of the error transfer coefficient express of modal wave-front reconstruction has been proved.
In the adaptive optical system, the gradient measuring error of Hartmann-Shack wave-front sensor is one of the main error sources affecting wave-front reconstruction precision. In this paper, the universality error transfer coefficient expression of modal wave-front reconstruction has been derived. Make use of the gradient data measured with Hartmann-Shack wave-front sensor in 61-element adaptive optical system, the correctness of the error transfer coefficient express of modal wave-front reconstruction has been proved.
2000,
12.
Abstract:
In this paper, the physical mechanism of BFEL was first analyzed on basis of the theory of Compton scattering. Then, the idea on output of both infrared laser and X rays in BFEL is put forward according to the result of analysis. Finally, the initial plan of experiment and the actual significance about the idea is expressed.
In this paper, the physical mechanism of BFEL was first analyzed on basis of the theory of Compton scattering. Then, the idea on output of both infrared laser and X rays in BFEL is put forward according to the result of analysis. Finally, the initial plan of experiment and the actual significance about the idea is expressed.
2000,
12.
Abstract:
Based on matrix optics, transformation matrices of optical transmitting system and the expressions of focal length adjustment for the system with two-beam expanding systems are derived. Incident angle effect on focus is studied. The effect of the focal length of the first beam expanding system on the whole system focal length is calculated.
Based on matrix optics, transformation matrices of optical transmitting system and the expressions of focal length adjustment for the system with two-beam expanding systems are derived. Incident angle effect on focus is studied. The effect of the focal length of the first beam expanding system on the whole system focal length is calculated.
2000,
12.
Abstract:
A novel line focus system with active optics for X-ray laser research is suggested. It consists of a active mirror, a cylinder lens and a aspherical lens. The Intensity distribution of line focus is uniform and its length can be tunable continuously in certain range. In this paper, the profile along the line focus is simulated and analyzed in details based on the principle of physical optics. With respect to the incident laser beam with Gaussian intensity, the possibility of controlling the line focus profile by active optics system is discussed.
A novel line focus system with active optics for X-ray laser research is suggested. It consists of a active mirror, a cylinder lens and a aspherical lens. The Intensity distribution of line focus is uniform and its length can be tunable continuously in certain range. In this paper, the profile along the line focus is simulated and analyzed in details based on the principle of physical optics. With respect to the incident laser beam with Gaussian intensity, the possibility of controlling the line focus profile by active optics system is discussed.
2000,
12.
Abstract:
The experimental study of the dielectric coating for deformable mirrors in COIL laser system is reported. The coating Sub/Ag(SiO2/HfO2)4/Air and Sub/Ag(YbF3/ZnS)3/air have been manufactured in high vacuum deposition chamber. The optical and physical properties of high reflectance dielectric coatings subjected to a large number of deformation cycles are determined. The reflectance of these mirrors is 99.90% and 99.87% respectively. The physical properties of the deformable mirrors have not been changed under deformable cycle 109 times. The thermal distortion and laser induced damage of deformable mirror irradiated with COIL laser are investigated. It is concluded that 1kw/cm2 laser power density is safe and reliable for these deformable mirrors in COIL laser system.
The experimental study of the dielectric coating for deformable mirrors in COIL laser system is reported. The coating Sub/Ag(SiO2/HfO2)4/Air and Sub/Ag(YbF3/ZnS)3/air have been manufactured in high vacuum deposition chamber. The optical and physical properties of high reflectance dielectric coatings subjected to a large number of deformation cycles are determined. The reflectance of these mirrors is 99.90% and 99.87% respectively. The physical properties of the deformable mirrors have not been changed under deformable cycle 109 times. The thermal distortion and laser induced damage of deformable mirror irradiated with COIL laser are investigated. It is concluded that 1kw/cm2 laser power density is safe and reliable for these deformable mirrors in COIL laser system.
2000,
12.
Abstract:
An heating effects analysis of laser unstable cavity CaF２ window for convective cooling system is proposed. The influence upon temperature increment and temperature gradient of such different laser power is describe. The finit differential method is used to calculate the results.
An heating effects analysis of laser unstable cavity CaF２ window for convective cooling system is proposed. The influence upon temperature increment and temperature gradient of such different laser power is describe. The finit differential method is used to calculate the results.
