高重频大能量亚纳秒板条激光放大器研究北大核心CSCD

高重频大能量亚纳秒固体激光器具有重复频率高、单脉冲能量大、峰值功率高等特点,在国防军事工业加工等领域具有广泛的应用前景。本文报道了一种基于板条多程放大的亚纳秒激光放大器。种子光为重复频率1 kHz、平均功率4.5 W、脉冲宽度700 ps、波长1064 nm的基模激光,经过光束整形以匹配板条放大器口径,放大级采用角度复用及偏振变换实现四程放大,最终实现了重频1 kHz、单脉冲能量189 mJ、脉冲宽度720 ps、光束质量2倍衍射极限的亚纳秒激光输出。

Research on high repetition frequency and high energy sub nanosecond slab laser amplifier

High repetition frequency and high energy sub nanosecond solid state lasers have the characteristics of high repetition frequency,large single pulse energy and high peak power,which have a wide application prospect in the fields of national defense,military industry and industrial processing.In this paper,a sub nanosecond laser amplifier based on slab multi pass amplification is proposed.The seed light is a fundamental mode laser with a repetition frequency of 1 kHz,an average power of 4.5 W,a pulse width of 700 ps and a wavelength of 1064 nm.Then,the laser beam is shaped to match the caliber of the slab amplifier.The amplification stage adopts angle multiplexing and polarization transformation to achieve four way amplification.Finally,a sub nanosecond laser output with a frequency of 1 kHz,a single pulse energy of 189 mJ,a pulse width of 720 ps and a beam mass of 2 times the diffraction limit is achieved.