Mr. Xianyun Wu Profile

Xianyun Wu

at Chengdu Normal Univ.

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Publications (2)

Proceedings Article | 31 May 2023 Paper

Spectrum reshaping of chirped laser pulse by scanning amplitude limiting based on optical Kerr effect

Rong Ye, Xiang Gao, Tingting Zeng, Xianyun Wu, Hongmei Li, Renxuan Liu

Proceedings Volume 12711, 1271102 (2023) https://doi.org/10.1117/12.2682965

KEYWORDS: Pulse signals, Ultrafast phenomena, Kerr effect, Laser frequency, Laser applications, Interferometers, Transmittance, Optical limiting

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Proceedings Article | 24 October 2017 Paper

The method for scanning reshaping the spectrum of chirped laser pulse based on the quadratic electro-optic effects

Rong Ye, Ming Yin, Xianyun Wu, Hang Tan

Proceedings Volume 10457, 104570I (2017) https://doi.org/10.1117/12.2282525

KEYWORDS: Kerr effect, Pulsed laser operation

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T A new method for scanning reshaping the spectrum of chirped laser pulse based on quadratic electro-optic effects is proposed. The scanning reshaping scheme with a two-beam interference system is designed and the spectrum reshaping properties are analyzed theoretically. For the Gaussian chirped laser pulse with central wavelength λ₀=800nm, nearly flat-topped spectral profiles with wider bandwidth is obtained with the proposed scanning reshaping method, which is beneficial to compensate for the gain narrowing effect in CPA and OPCPA. Further numerical simulations show that the reshaped spectrum is sensitive to the time-delay and deviation of the voltage applied to the crystal. In order to avoid narrowing or distorting the reshaped spectrum pointing to target, it is necessary to reduce the unfavorable deviations.

With the rapid and wide applications of ultra-short laser pulse supported by some latter research results including photo-associative formation of ultra-cold molecules from ultra-cold atoms^[1-3], laser-induced communications^[4], capsule implosions on the National Ignition Facility(NIF)^[5-6], the control of the temporal and spectral profiles of laser pulse is very important and urgently need to be addressed. Generally, the control of the pulse profiles depends on practical applications, ranging from femtosecond and picosecond to nanosecond. For instance, the basic shaping setup is a Fourier transform system for ultra-short laser pulse. The most important element is a spatially patterned mask which modulates the phase or amplitude, or sometimes the polarization after the pulse is decomposed into its constituent spectral components by usually a grating and a lens^[7].

One of the generation techniques of ultra-short laser pulse is the chirped pulse amplifications(CPA), which brings a new era of development for high energy and high peak intensity ultra-short laser pulse, proposed by D. Strcik and G. Mourou from the chirping radar technology in microwave region since 1985^[8]. The other generation technique of ultra-short pulse is the optical parametric chirped pulse amplification(OPCPA) invented by Dubietis et al. in 1992, which combined the respective superiorities of CPA and optical parametric amplification(OPA). However, there are disadvantages for the both technologies such as gain narrowing, gain saturation effects, and even spectrum shift. The first one among the three is the most significant which narrows the spectrum after amplification so that it limits the minimum durations of ultra-short laser pulse.

This paper proposed a approach for scanning reshaping the spectrum of chirped laser pulse to compensate for the gain narrowing effect, according to the characteristics of the chirped laser pulse, i.e. the frequency varies with time linearly. The spectral characteristics of the scanning reshaping was analyzed quantitatively. Furthermore, the influence of the time-delay and deviation of the controlling voltage employed on the electro-optic crystal on the reshaped spectrum was also been discussed in detail.

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