长波红外等离子体压缩种子源
Seed source for plasma compression in the long wavelength infrared
摘要：
双色激光脉冲用于形成空气等离子体并产生适合作为CO2激光脉冲后向拉曼放大的种子的宽带红外辐射。在大气窗口观测到8-14微米的宽带辐射。红外辐射的特征在于使用长波长光栅光谱仪，该光谱仪专门设计用于在其输入平面处接收电离激光灯丝。通过啁啾驱动脉冲，大大提高了长波红外的产额。单向脉冲传播模拟表明，这部分是由于非线性折射率对脉冲持续时间的依赖性。
英文摘要：
Two color laser pulses are used to form an air plasma and generate broadband infrared radiation suitable as a seed for backward Raman amplification of CO2 laser pulses. Broadband radiation in the atmospheric window from 8-14 microns is observed. The infrared radiation is characterized using a long wavelength grating spectrometer specially designed to accept an ionizing laser filament at its input plane. The LWIR yield is greatly enhanced by chirping the drive pulse. Unidirectional pulse propagation simulations suggest that this is due in part to the dependence of the nonlinear refractive index on the pulse duration.
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