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对固体激光器进行模式控制可以产生涡旋光通信、目标探测等需要的高质量涡旋光．在调Q脉冲运行状态下，同一角向阶次相反螺旋手性光场的选择成为调Q涡旋固体激光器目前面临的一个主要技术瓶颈．提出将小功率种子涡旋光注入到谐振腔中进行脉冲激光手性选择，建立了种子注入下多光场速率方程模型，研究了阈值注入信噪比、单脉冲能量、径向模谱等特性．结果表明：阈值注入信噪比随模式角向阶次升高而上升，抽运功率、输出镜反射率和谐振腔长度增大均使阈值注入信噪比升高．注入状态下单脉冲能量与自由运转状态下单脉冲能量的比值随角向阶次的升高有所下降，增加抽运功率、减小输出镜反射率、减小谐振腔长度可使该值升高．适当的激光器参数下，谐振腔对种子光的径向模谱具有一定的净化作用．本文的手性控制方案及研究结果可为涡旋光激光器的研究提供参考．Optical vortex beam has wide application prospect in areas such as optical communication, lidar detection and optical trapping. To increase the operating distance, a high-power vortex laser source is necessary in these applications. Control of the spiral chirality of the Laguerre-Gaussian (LG) mode has become a key problem in Q-switched pulsed solid-state vortex lasers. We put forward the injection seeding method to control the spiral chirality of the LG mode in Q-switched laser cavity. The schematic of the method is shown in Fig. (a), a small power continuous wave vortex beam with determined chirality is injected into the laser cavity, with the gain medium pumped by a ring-shaped beam. The optical field has the same spiral chirality with the injected beam will surpass the optical field has the opposite spiral chirality and the chirality purity increases as the injected power increasing. The threshold injected signal-to-noise ratio increases with the angular order of the LG mode, this is due to the decreasing of the overlapping of the standing wave pattern of the opposite chirality beam. The threshold injected signal-to-noise ratio also increases with the pumping power and the reflectivity of the output mirror. The ratio of the pulse energy under injection to the pulse energy under free running decreases with the rising angular order. This ratio increases with the rising pumping power and decreases with the increasing reflectivity of the output mirror. The seeding beam, which is generated by spiral phase modulation on the fundamental mode beam, always has a wide radial spectrum. The radial spectrum of the beam generated by second order spiral phase modulation on the fundamental mode beam is shown in Fig. (b). Under proper ring width of the pumping beam, this radial spectrum can be purified in the Q-switched laser cavity, as is shown in Fig. (c). Therefore, the spiral phase modulated beam can be used as the seeding source to generate high-purity vortex pulse.
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Keywords:
- solid-state laser /
- vortex beam /
- chirality control /
- injection seeding
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