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用于抽运钛宝石的电光调Q Nd:YAG激光器会出现自锁模调制,导致峰值功率不稳从而损伤钛宝石晶体,为了抑制这种自锁模调制,分析了产生该现象的原因,研究了谐振腔内插入法布里-珀罗(F-P)标准具的技术方案。实验采用单个厚度20mm,膜层反射率60%的标准具,有效抑制了该Nd:YAG激光器的自锁模调制,实现了脉宽约70ns,脉冲能量约600mJ的1064nm激光的稳定输出,既避免了引入较大的插入损耗,又防止了对F-P标准具膜层的损伤。分析认为单个厚度合适、膜层反射率不太高的标准具可有效抑制Nd:YAG激光器自锁模现象的原因在于:标准具一个透射峰半峰全宽(FWHM)内理论上虽有约5个纵模,但偏离透射峰中心的纵模损耗较大,使得单个透射峰内实际起振的纵模可能只有1个;激光器的增益线宽内虽存在标准具的多个透射峰,但起振纵模因不相邻避免了形成相位锁定。
In the electro-optical Q-switched Nd: YAG laser used for pumping titanium sapphire, self-mode-locked modulation occurs, resulting in unstable peak power and damaging the sapphire crystal. In order to suppress this self-mode-locked modulation, the reason for this phenomenon is analyzed. The scheme of inserting the Fabry-Perot (FP) etalon into the cavity is presented. The experiment uses a single etalon with a thickness of 20mm and a reflectance of 60%, which effectively restrain the self-mode-locked modulation of the Nd: YAG laser and achieve a stable output of 1064nm laser with a pulse width of about 70ns and a pulse energy of about 600mJ. The introduction of a larger insertion loss, but also to prevent the FP standard layer of damage. The reason why the etalon with a suitable thickness and the reflectivity of the film is not too high can effectively restrain the self-mode-locking effect of the Nd: YAG laser is that the etalon has a theoretical FWHM of about 5 However, the loss of the longitudinal mode deviating from the center of the transmission peak is large, so that there may be only one longitudinal mode actually started in a single transmission peak. Although there are multiple transmission peaks of the etalon in the gain line width of the laser, The vibration modes are not adjacent to avoid the formation of phase lock.