Gain-switched and mode-locked 2 μm Tm/Ho-codoped fiber laser
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摘要: 首次报道了中心波长为1958 nm的增益开关锁模铥/钬共掺光纤激光器，增益开光脉冲包络和锁模次脉冲的重复频率分别为20 kHz和14. 8 MHz。将此增益开关锁模光纤激光作为种子源，在掺铥光纤放大器中产生了平坦的超连续谱光源。超连续谱的最大输出功率为2. 17 W，其长波长边已扩展到2750 nm， 10 dB带宽约为640 nm（光谱范围1953~2593 nm）。Abstract: Gain-switched by 1550 nm pulsed laser, a simultaneously gain-switched and mode-locked Tm/Ho-codoped fiber laser with a central wavelength of 1958 nm is obtained. The pulse train contains many mode-locked sub-pulses within one gain-switched pulse envelope. Using this pulsed laser as a seed source, a flat supercontinuum (SC) is generated in a Tm-doped fiber amplifier where Tm-doped fiber is both the non-linear and gain medium. For the average output power of 2. 17 W, the observed spectrum covers the spectral range of 1953 to 2593 nm with a 10 dB bandwidth of 640 nm and the long wavelength edge of SC spectrum is extended to 2750 nm.
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Key words:
- fiber laser /
- gain-switching /
- mode-locking /
- Tm-doped fiber amplifier /
- supercontinuum generation
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