Registration of picosecond CO2 laser pulses by means of two-stage parametric transformation in nonlinear crystals
Registration of picosecond CO2 laser pulses by means of two-stage parametric transformation in nonlinear crystals
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通过非线性晶体中的两级参数变换记录皮秒 CO2 激光脉冲
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
V. Sorochenko
中科院分区：
文献类型：
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作者：
N. Pletnev;V. Apollonov;V. Sorochenko
本文描述了在调Q泵浦非线性晶体的情况下，利用红外辐射频率到可见光的两级参数变换，记录能量为1.5-4.5μJ、波长为10.27μm的CO_2激光脉冲时间结构的技术。第一阶段采用GASE非线性晶体(10.27μm+1.064μm→0.964μm)。用同样的泵浦方式在α-HIO_3非线性晶体中实现了辐射的进一步变换(1.064μm+0.960μm→0.506μm)。在所提出的光学方案中，第一次在频率转换器的级之间不存在额外的光学元件。转换后的辐射用滨松时间分散器C1587条纹相机记录在光电阴极最大光谱灵敏度为∼0.5μm的区域，时间分辨率高达2ps。CO_2激光器的最小记录脉冲宽度为∼45ps。
A technique for registering the temporal structure of picosecond pulses of CO2 laser radiation with an energy of 1.5–4.5 μJ at a wavelength of 10.27 μm using two-stage parametric transformation of IR radiation frequency into visible light under pumping of nonlinear crystals by Nd:YAG-laser radiation in a Q-switched mode is described. A GaSe nonlinear crystal was used at the first stage of transformation (10.27 μm + 1.064 μm → 0.964 μm). Radiation was further transformed (1.064 μm + 0.960 μm → 0.506 μm) by using the same pumping in an α-HIO3 nonlinear crystal. For the first time, no additional optical elements were present between the stages of the frequency transformer in the proposed optical scheme. The transformed radiation was registered with a Hamamatsu Temporal Disperser C1587 streak camera in a region of the photocathode maximum spectral sensitivity of ∼0.5 μm with a temporal resolution of up to 2 ps. The minimum recorded pulse duration of the CO2 laser was ∼45 ps.