Contrast Measurement of Ultrashort Laser Pulse with Third Order Correlation Technique

Fuling, 张福领 Zhang; Xiaoping, 欧阳小平 Ouyang; Xinglong, 谢兴龙 Xie; Qingwei, 杨庆伟 Yang; Ailin, 郭爱林 Guo; Meizhi, 孙美智 Sun; Zunqi, 林尊琪 Lin

doi:10.3788/cjl20093605.1171

中国激光

2009

DOI: 10.3788/cjl20093605.1171

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Contrast Measurement of Ultrashort Laser Pulse with Third Order Correlation Technique

张福领 Zhang Fuling¹,

欧阳小平 Ouyang Xiaoping²,

谢兴龙 Xie Xinglong³

et al.

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2012

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Experimental research and application of pulse clean technique based on cross polarized wave generation

Wang¹,

Yan-Sui²,

Yi³

et al. 2012

Acta Phys. Sin.

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Cross polarized wave (XPW) generation technique is used to improve the contrast of the output pulses from a 800 nm Ti: sapphire femtosecond (fs) laser. The measured temporal contrast of the cleaned pulse is 1011 (limited by the dynamic range of the third-order auto-correlator), which is 3 orders of magnitude higher than the temporal contrast ratio of the initial pulse. The efficiency of XPW is 22%. And the bandwidth of the cleaned pulse is broadened after the XPW nonlinear process. Through the dispersion compensation using double chirped mirrors and fused silica plate, the 25 fs pulse duration is achieved. With the cleaned pulse used as the seed of a TW-level Ti: sapphire chirped-pulse amplification laser system, the 250 mJ/50 fs pulses corresponding to 5 TW peak power are obtained. And the 1011 temporal contrast is demonstrated on the time scale of hundreds of picoseconds before the main femtosecond pulse.

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Experimental research and application of pulse clean technique based on cross polarized wave generation

Wang¹,

Yan-Sui²,

Yi³

et al. 2012

Acta Phys. Sin.

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A scanning filtering method for enhancing the signal-to-noise ratio of chirped laser pulse

Zeng¹,

Zeng²,

Zhang³

et al. 2012

Acta Phys. Sin.

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Based on the principle of scanning filtering, a new optical scanning filtering method for improving signal-to-noise ratio(SNR) of the chirped pulse is proposed. For the scanning filtering scheme of Fabry-Perot (F-P) etalon including an electro-optic crystal, the spectral characteristics of the scanning filter are analyzed quantitatively. Furthermore, the effects of the reflectivity of the parallel-plates of F-P etalon and the types of the electro-optic crystals on the output SNR are discussed in detail, and the influence of the variation of the controlling voltage applied to the electro-optic crystal on the filtering effect is also studied. The results show that the narrower the bandwidth of scanning filter transmission window is, the better the improved SNR will be. In order to ensure the filtering effect, the reflectivity of the parallel-plates of F-P etalon should be more than 0.9. Compared with the scheme of scanning filter built-in ordinary linear electro-optic crystal, the scheme of F-P etalon including an secondary standard electro-optic crystal, i.e., KTa1-xNbxO3 crystal, requires a low voltage, and it is easy to control. The differences of KTa1-xNbxO3 crystal components have little influence on the filtering effect, whereas the variations of controlling voltage and chirp rate of the signal exhibit a greater influence on the filtering effect.

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Contrast Measurement of Ultrashort Laser Pulse with Third Order Correlation Technique

Cited by 2 publications

References 0 publications

Experimental research and application of pulse clean technique based on cross polarized wave generation

Experimental research and application of pulse clean technique based on cross polarized wave generation

A scanning filtering method for enhancing the signal-to-noise ratio of chirped laser pulse

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