重复频率3Hz、100mJ高光束质量钕玻璃放大器的研制

研制了具有放大纳秒方形激光脉冲的高光束质量、高稳定的激光二极管(LD)抽运的钕玻璃激光放大器。为了获得较高的输出能量,采用LD泵浦的"串联式双程放大"高增益组件进行能量放大。为了获得高光束质量的光斑,利用液晶空间光调制器(LCSLM)对光束近场分布进行空间整形,使之产生特定的空间分布,进而对后级放大器增益不均匀性进行光学预补偿。放大器工作波长为1 053nm,工作频率为3 Hz,输入1nJ的3ns方形激光脉冲,输出激光脉冲能量为100mJ、光束口径为10mm×10mm的方光斑,能量不稳定度小于2%(均方根),净增益大于109。光束的近场调制度小于1.3∶1,远场焦斑衍射极限小于2DL,远场角漂移小于9.5μrad。

Fabrication of repetition frequency 3 Hz,100 mJ high-beam-quality Nd-glass amplifier

A high-beam-quality and high-stability all-solid-state Nd:glass amplifier with laser diode(LD) side-pumping applied to amplify a nanosecond laser pulse source has been developed in this paper.The maximum output energy can be obtained when high-gain components with serial two-pass LD pumping amplification are used.On the other hard,the liquid crystal spatial light modulator(LCSLM) is used to produce a particular spatial distribution in the near field to pre-compensate the gain uniformity of the latter amplifier in order to get high-quality spot.The operating wavelength and frequency are 1 053 nm and 3 Hz,respectively.When the amplifier is seeded with a 1 nJ and 3 ns flattened pulse,the output energy is 100 mJ with beam spot of 10 mm×10 mm,energy instability less than 2%(root-mean-square),net gain more than 109.The modulation in the near field is less than 1.3∶1,the diffraction limit of focus spot in the far field is less than 2DL,and the far field angle shift is less than 9.5 μrad.