Fourth harmonic generation of DKDP crystal
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摘要: 生长了不同氘含量的磷酸二氘钾(DKDP)晶体，切割角度统一沿Ⅰ类非临界相位匹配方向，即与晶体z轴成90与x轴成45，分别在1 064 nm和1 053 nm两种基频波长下进行了四倍频实验，通过测定氘含量与相位匹配角的联系，确定出能够实现非临界四倍频的DKDP晶体的最佳氘含量。实验发现在1 064 nm的基频波长下通过调节DKDP晶体的氘含量无法实现室温的非临界相位匹配，而在1 053 nm基频波长下实现室温的非临界相位匹配的DKDP晶体最佳氘含量为85%左右Abstract: Deuterated dihydrogen phosphate(DKDP) crystals of different deuterium contents were cut for type-I non-critical phase-matching with the direction at 90 to the crystal z axis and at 45 to the crystal x axis， and then measured in the fourth harmonic generation experiments with fundamental wavelengths of 1 064 nm and 1 053 nm， respectively. The optimum deuterium content of DKDP crystal was confirmed by measuring the relation between deuterium content and phase-matching angle. The results indicate that DKDP crystal can not achieve non-critical phase matching by adjusting its deuterium content at room temperature with the fundamental wavelength of 1 064 nm. However， at the fundamental wavelength of 1 053 nm， the optimum deuterium content of DKDP crystal is 85%， to achieve non-critical phase matching at room temperature.
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