Beam cleaning of an incoherent laser via plasma Raman amplification

被引：16

作者：

Edwards, Matthew R. ^{[1
]}

Qu, Kenan ^{[2
]}

Mikhailova, Julia M. ^{[1
]}

Fisch, Nathaniel J. ^{[2
]}

机构：

[1] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA

[2] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

来源：

PHYSICS OF PLASMAS | 2017年 / 24卷 / 10期

基金：

美国国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

PULSE GENERATION; COMPRESSION; SCATTERING; INSTABILITY; LIGHT; FOCUSABILITY; WAVELENGTH; AMPLIFIER;

D O I：

10.1063/1.4997246

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We show that backward Raman amplification in plasma can efficiently compress a temporally incoherent pump laser into an intense coherent amplified seed pulse, provided that the correlation time of the pump is longer than the inverse plasma frequency. An analytical theory for Raman amplification using pump beams with different correlation functions is developed and compared to numerical calculations and particle-in-cell simulations. Since incoherence on scales shorter than the instability growth time suppresses spontaneous noise amplification, we point out a broad regime where quasi-coherent sources may be used as efficient low-noise Raman amplification pumps. As the amplified seed is coherent, Raman amplification additionally provides a beam-cleaning mechanism for removing incoherence. At near-infrared wavelengths, finite coherence times as short as 50 fs allow amplification with only minor losses in efficiency. Published by AIP Publishing.

引用

页数：7

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