单程高增益激光种子自由电子激光放大器中超辐射的实验表征

Experimental characterization of superradiance in a single-pass high-gain laser-seeded free-electron laser amplifier.

作者信息

Watanabe T, Wang X J, Murphy J B, Rose J, Shen Y, Tsang T, Giannessi L, Musumeci P, Reiche S

机构信息

National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.

出版信息

Phys Rev Lett. 2007 Jan 19;98(3):034802. doi: 10.1103/PhysRevLett.98.034802.

DOI:10.1103/PhysRevLett.98.034802

PMID:17358688

Abstract

In this Letter we report the first experimental characterization of superradiance in a single-pass high-gain free-electron laser (FEL) seeded by a 150 femtosecond (FWHM) Ti:sapphire laser. The nonlinear energy gain after an exponential gain regime was observed. We also measured the evolution of the longitudinal phase space in both the exponential and superradiant regimes. The output FEL pulse duration was measured to be as short as 81 fs, a roughly 50% reduction compared to the input seed laser. The temporal distribution of the FEL radiation as predicted by a numerical simulation was experimentally verified for the first time.

摘要

在本信函中，我们报告了由150飞秒（半高宽）钛宝石激光器注入种子光的单程高增益自由电子激光器（FEL）中受激辐射放大的首次实验表征。观察到了指数增益区之后的非线性能量增益。我们还测量了指数增益区和受激辐射放大区中纵向相空间的演化。测量得到的输出FEL脉冲持续时间短至81飞秒，与输入种子激光相比大约缩短了50%。首次通过实验验证了数值模拟所预测的FEL辐射的时间分布。