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采用基于一体化结构的环形倍频腔,比较了Hansch-Couillaud,Pound-Drever-Hall和内调制3种锁定方法,研究了不同倍频晶体长度和晶体内光束直径分布对倍频过程稳定性的影响。实验结果表明,一体化腔结构有效提高了抗干扰能力和稳定性;使用3种倍频腔锁定方法达到的倍频输出功率的稳定度为3%(其中基频光功率漂移为2%)。实验发现,由于晶体对倍频光的吸收,过长的晶体长度、过小的晶体内光束直径和不合适的光腰位置,可明显影响倍频光的最大倍频功率和稳定性。实验得到的最大461 nm蓝光倍频输出功率310 mW,倍频效率54.8%,净倍频效率71.3%。实验还比较了不同反射率输入耦合镜的耦合率。
A ring-shaped double-frequency cavity based on an integrated structure was used to compare three kinds of locking methods, Hansch-Couillaud, Pound-Drever-Hall and internal modulation. The effects of different doublet crystal length and intracrystalline beam diameter distribution on the stability of frequency doubling process influences. The experimental results show that the integrated cavity structure effectively improves the anti-jamming ability and stability. The stability of the output power of the frequency doubling achieved by using the three kinds of double-frequency cavity locking methods is 3% (of which the fundamental optical power drift is 2%). The experimental results show that the maximum octave power and stability of frequency doubling light can be significantly affected by the crystal’s absorption of frequency doubling light, long crystal length, too small intracrystalline beam diameter and improper optical waist position. The maximum blue light output of 461 nm is 310 mW, the doubling efficiency is 54.8% and the net doubling frequency is 71.3%. The experiment also compares the coupling ratio of different reflectance input coupling mirror.