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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.
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Key words:
- CO2 laser /
- rapidly tunable /
- acousto-optic modulator /
- grating
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图 4 声光调制器时序控制示意图
Figure 4. Schematic of sequential control of the acousto-optic modulator
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