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相干合成技术是实现高功率、高亮度光纤激光系统的重要技术途径.然而,脉冲激光阵列中常常存在时域误差,这将影响脉冲激光的相干合成效果.建立了脉冲激光存在时域误差时的相干合成理论模型,并在不同波形(方波、三角波、正弦波)的脉冲激光存在时域误差时,对相干合成光束在远场的脉冲波形、峰值功率、光强分布和桶中功率(PIB)等特性进行了数值计算和对比分析.计算结果表明:方波脉冲激光相干合成光束的脉冲波形受时域误差影响严重,光强分布和PIB随着时域误差的增大发生线性变化;三角波脉冲激光相干合成光束的脉冲波形和峰值功率受时域误差影响严重,光强分布和PIB在时域误差较大时随着时域误差的增大发生较为剧烈的变化;正弦波脉冲激光相干合成光束具有较好的输出特性,在两路正弦波脉冲激光相干合成中,将两脉冲之间的时延控制在脉冲持续时间的10%以内,就能取得良好的合成效果.
However, there are often time-domain errors in pulsed laser arrays, which will affect the coherent synthesis of pulsed lasers, and the time-domain error of pulsed lasers is established Coherent synthesis theory model. When there are time-domain errors in pulsed lasers with different waveforms (square wave, triangular wave, sine wave), the pulse waveforms, peak power, light intensity distribution and the power in the barrel ) Were calculated and compared.The results show that the pulse waveform of the pulsed laser coherent beam is seriously affected by the time-domain error, the light intensity distribution and the PIB change linearly with the increase of the time-domain error, and the triangular wave The pulse waveform and peak power of pulsed laser-coherently synthesized beam are seriously affected by the time-domain error. The light intensity distribution and the PIB undergo more dramatic changes with the increase of the time-domain error when the time-domain error is larger. Sine wave pulsed laser coherent synthesis The beam has good output characteristics, in the two sinusoidal pulse laser coherent synthesis, the delay between the two pulses in the pulse control Less than 10% of the time, you can get a good synthesis results.