Pulse width measurement of UV femtosecond laser
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摘要: 相对于近红外波段的飞秒激光脉冲，紫外波段的飞秒脉冲由于具有单光子能量高、聚焦特性好、电离率高和成丝阈值低等优点，在高功率密度光场的产生、等离子体光物理等领域有着越来越广阔的应用前景，成为激光技术的研究热点。随着紫外飞秒激光技术的发展，传统的脉宽测量方法不能满足需求。指出了紫外飞秒激光脉宽测量研究的主要进展，讨论了目前可用于紫外飞秒激光脉宽的测量方法，主要有双光子荧光测量法、互相关法、简并四波混频法、多光子电离法，介绍了相关测量原理与特点。在此基础上，对紫外飞秒激光脉宽测量技术研究前景进行了展望。Abstract: Compared with femtosecond laser pulses in the near-infrared region, femtosecond pulses in the ultraviolet region have the advantages of high single-photon energy, good focusing property, high ionization rate and low filament threshold value.It has broad application prospects in the production of high power density optical field and the field of plasma photophysics.Femtosecond pulses in the ultraviolet region have become a hot spot of laser technology.With the development of ultraviolet femtosecond laser technology, the traditional pulse width measurement method cannot meet the demand.The main advances in the study on pulse width measurement of ultraviolet femtosecond lasers are pointed out.The measurement methods currently available for ultraviolet (UV) femtosecond laser pulse width are discussed, mainly including two-photon fluorescence measurement, cross-correlation method, degenerate four-wave mixing method, multiphoton ionization method.The relevant easurement principles and characteristics are introduced.Based on the research, the research prospects of the ultraviolet femtosecond laser pulse width measurement technology are prospected.
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