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介绍了一种用于高功率大型激光装置的多路红外激光脉冲波形测量原理和系统构成。整个测量系统由取样与光纤耦合单元、光纤传输单元、光纤合束与光电转换单元、数据采集单元构成,针对多路合束导致测量系统存在取样稳定性难题采用望远缩束、成像相结合的光纤耦合方法解决了光束的角漂问题,并对脉冲测试的影响因素进行了系统评价。实验结果表明,利用该系统测得的纳秒脉冲展宽量小于150 ps,系统稳定耦合角度变化范围大于±1 mrad。该技术降低了系统的复杂性,降低了测量成本,有效地解决了时间脉冲波形测试中稳定耦合问题,保证了测量系统的可靠性。
A multi-channel infrared laser pulse waveform measuring principle and system configuration for a high-power large-scale laser device is introduced. The whole measurement system consists of sampling and fiber coupling unit, optical fiber transmission unit, optical fiber combining and photoelectric conversion unit, data acquisition unit. For the multi-path coupling measurement system, there is sampling stability problem. The fiber-optic coupling method solves the problem of angular drift of the light beam and systematically evaluates the influencing factors of the pulse test. The experimental results show that the nanosecond pulse broadening measured by this system is less than 150 ps, and the range of stable coupling angle is greater than ± 1 mrad. The technology reduces the complexity of the system, reduces the measurement cost, effectively solves the problem of stable coupling in the time pulse waveform test, and ensures the reliability of the measurement system.