中国光学, 2019, 12 (2): 355, 网络出版: 2020-02-11   

声光偏转快调谐脉冲CO2激光器实验研究

Experimental research on acousto-optic deflection rapid tuning pulsed CO2 lasers
作者单位
1 解放军电子工程学院 脉冲功率激光技术国家重点实验室, 安徽 合肥 230037
2 中国科学院 长春光学精密机械与物理研究所 激光与物质相互作用国家重点实验室, 吉林 长春 130033
3 中国科学院大学, 北京 100049
摘要
采用双声光调制器光路快速偏转技术与自准直光栅法实现CO2激光全波段快调谐同光路输出。首先对声光调制器特性进行实验研究, 结果显示: 声光调制器偏转角度约为44°, 与运用布拉格方程计算结果相符; 且激光单次通过声光调制器移频量为4068 MHz,与声光驱动器射频频率一致, 将激光往返多次经声光调制器的移频量叠加。进而, 开展基于声光调制器的CO2激光快调谐实验研究, 运用两个对称布置的同驱动频率声光调制器补偿声光移频, 实现偏转光路振荡输出, 运用光栅法在直线光路中实现激光全波段可调谐输出。最终, 在声光调制器时序控制下, 实现双波长激光快调谐同光路输出, 选定激光波长的切换时间约为1 ms, 脉宽小于300 ns, 且双波长切换速度不受CO2激光跃迁谱带的限制。
Abstract
A rapid tuning pulsed CO2 laser is presented using a blazed grating system and a pair of acousto-optic modulators. Firstly, the characteristics of acousto-optic modulators were studied through experimentation. The results showed that the deflection angle of the acousto-optic modulator was approximately 44°, which was in agreement with the calculations of the Bragg equation. When a single laser passed the acousto-optic modulator, the shift in frequency was approximately 4068 MHz, which was in agreement with the acousto-optic driving frequency. In addition, when multiple lasers passed through the acousto-optic modulator, the shift in frequency was compounded. Based on the acousto-optic modulator results, experimental research was performed on rapid tuning pulsed CO2 lasers. In order to offset the shift in acousto-optic frequency, two acousto-optic modulators were placed symmetrically in the deflected optical beam, and a laser output was obtained. Using a blazed grating, a full band tunable output laser was obtained in the linear optical beam. Finally, under sequential control of double acousto-optic modulators, a double wavelength laser with rapid tuning output and a common optical axis was obtained. The tuning time of the pulsed laser was approximately 1 ms, which pulsed at a width of less than 300 ns. The tuning speed of the pulsed laser was independent of the transition band of the CO2 laser.

潘其坤, 俞航航, 陈飞, 谢冀江, 何洋, 于德洋, 张阔. 声光偏转快调谐脉冲CO2激光器实验研究[J]. 中国光学, 2019, 12(2): 355. PAN Qi-kun, YU Hang-hang, CHEN Fei, XIE Ji-jiang, HE Yang, YU De-yang, ZHANG Kuo. Experimental research on acousto-optic deflection rapid tuning pulsed CO2 lasers[J]. Chinese Optics, 2019, 12(2): 355.

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