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首页> 外文期刊>Applied physics. B, Lasers and optics >Generation of tunable 7-fs ultraviolet pulses: achromatic phase matching and chirp management
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Generation of tunable 7-fs ultraviolet pulses: achromatic phase matching and chirp management

机译：可调7-fs紫外线脉冲的产生：消色差相位匹配和线性调频脉冲管理

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摘要

Ultraviolet pulses with a duration of 7 fs are efficiently generated by frequency doubling the output of a non-collinear optical parametric amplifier. The ultraviolet pulses are tunable between 275 to 335 nm. The acceptance bandwidth of the doubling crystal is increased by a factor of 80 through high-order achromatic phase matching. The chirp of the visible pulses and the dispersion introduced along the beam path are compensated partially before and partially after the doubling crystal. For the design of the dispersion management, we investigate the second harmonic generation of pulses with mixed orders of chirp and explicitly discuss the transfer of the spectral phase in frequency doubling. A simple analytic theory is derived that correctly describes frequently observed spectral narrowing effects. We find that chirped SHG avoids spectral narrowing and allows for precompression of dispersion encountered in the ultraviolet beam path. We apply chirped SHG to generate 18.7 fs ultraviolet pulses in an extremely simple setup.
机译：通过使非共线光学参量放大器的输出倍频，可以有效地产生持续时间为7 fs的紫外线脉冲。紫外线脉冲在275至335 nm之间可调。通过高阶消色差相位匹配，双倍晶体的接收带宽增加了80倍。可见脉冲的chi和沿光束路径引入的色散在倍增晶体之前和之后得到部分补偿。对于色散管理的设计，我们研究了具有mixed混合阶数的脉冲的二次谐波生成，并明确讨论了倍频中频谱相位的转移。得出了一个简单的分析理论，可以正确地描述经常观察到的光谱变窄效应。我们发现，SH SHG避免了光谱变窄，并允许对紫外线路径中遇到的色散进行预压缩。我们应用chi SHG以极其简单的设置产生18.7 fs的紫外线脉冲。

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