Effect of residual chirp on ultrashort pulse width measured with autocorrelation method

HAO Xin; ZHU Qi-hua; ZHANG Ying; WANG Fang; WANG Xiao; ZHAO Lei; ZHOU Kai-nan; ZENG Xiao-ming

doi:10.3969/j.issn.1001-3806.2010.06.019

To study the effect of residual chirp on ultrashort pulse width measurement by means of the second harmonic autocorrelation,starting from its measurement principle,the effect was simulated for ultrashort laser pulses with different chirps at center wavelength of 800nm and pulse width of 100fs.The results show that the measured value would be larger than factual value with positive chirp,smaller with negative chirp.Moreover,the measurement error will be augmented with the chirp.The effect of the thickness of β-BaB2O4 (BBO) crystal on the pulse width measurement was also discussed numerically.It is found that choosing thin nonlinear crystal could control the measurement error effectively.Using the nonlinear crystal width of L≤0.5Ld, the measurement error caused by chirp can be controlled to an ideal range.

Effect of residual chirp on ultrashort pulse width measured with autocorrelation method

Corresponding author: ZHU Qi-hua, qihzh@163.com;

1. Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China;

2. Graduate School, China Academy of Engineering Physics, Mianyang 621900, China

Received Date: 2009-11-02

Accepted Date: 2010-05-05

Available Online: 2010-11-25

Abstract: To study the effect of residual chirp on ultrashort pulse width measurement by means of the second harmonic autocorrelation,starting from its measurement principle,the effect was simulated for ultrashort laser pulses with different chirps at center wavelength of 800nm and pulse width of 100fs.The results show that the measured value would be larger than factual value with positive chirp,smaller with negative chirp.Moreover,the measurement error will be augmented with the chirp.The effect of the thickness of β-BaB2O4 (BBO) crystal on the pulse width measurement was also discussed numerically.It is found that choosing thin nonlinear crystal could control the measurement error effectively.Using the nonlinear crystal width of L≤0.5Ld, the measurement error caused by chirp can be controlled to an ideal range.

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Reference (11)

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Effect of residual chirp on ultrashort pulse width measured with autocorrelation method

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通讯作者: 陈斌, bchen63@163.com

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