全保偏光纤光学频率梳技术
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摘要
飞秒光学频率梳是当今激光技术领域的重要研究方向。近年来,得益于保偏光纤及器件制作工艺的持续进步,全保偏光纤超快激光器和光学频率梳发展迅速。从技术角度回顾了全保偏光纤光学频率梳的发展过程:首先,简要介绍了光学频率梳的原理、结构和关键组成,就锁模脉冲自启动等关键技术进行了讨论;其次,介绍了几种超短脉冲放大及压缩技术,包括啁啾脉冲放大、非线性放大及分离脉冲放大;随后,介绍了与载波相位偏频信号(f0)锁定相关的超连续谱产生和自参考拍频探测技术,实验上获得了高达40dB的f0信号;最后,介绍了几种常用的锁定重复频率(fr)和f0信号的方法。
The femtosecond optical frequency comb is becoming an increasingly valuable research field in laser optics.In recent years,all polarization-maintaining(PM)fiber-based lasers and optical frequency combs have achieved rapid growth owing to the continuous improvement of both PM-fiber and device fabrication technology.Herein,the development of all PM-fiber-based optical frequency combs is reviewed from a technical perspective.First,the basic principle,framework,and key components of an optical frequency comb are briefly introduced,and each key technology of the frequency comb,such as self-started mode-locking,is discussed.Second,several methods for pulse amplification and pulse compression are described,such as chirped-pulse amplification,nonlinear amplification,and divided-pulse amplification.Third,supercontinuum generation and self-referenced interferometry technology related to carrier phase offset(f0)locking are introduced,and the f0 signal with a signal to noise ratio(SNR)as high as 40 dB is experimentally demonstrated.Finally,the methods for locked repetition frequencies(fr)and f0 signals are illustrated.
The femtosecond optical frequency comb is becoming an increasingly valuable research field in laser optics.In recent years,all polarization-maintaining(PM)fiber-based lasers and optical frequency combs have achieved rapid growth owing to the continuous improvement of both PM-fiber and device fabrication technology.Herein,the development of all PM-fiber-based optical frequency combs is reviewed from a technical perspective.First,the basic principle,framework,and key components of an optical frequency comb are briefly introduced,and each key technology of the frequency comb,such as self-started mode-locking,is discussed.Second,several methods for pulse amplification and pulse compression are described,such as chirped-pulse amplification,nonlinear amplification,and divided-pulse amplification.Third,supercontinuum generation and self-referenced interferometry technology related to carrier phase offset(f0)locking are introduced,and the f0 signal with a signal to noise ratio(SNR)as high as 40 dB is experimentally demonstrated.Finally,the methods for locked repetition frequencies(fr)and f0 signals are illustrated.
引文
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