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

LASER TECHNOLOGY > 2010 > 34(6): 789-793. > DOI: 10.3969/j.issn.1001-3806.2010.06.019

HAO Xin, ZHU Qi-hua, ZHANG Ying, WANG Fang, WANG Xiao, ZHAO Lei, ZHOU Kai-nan, ZENG Xiao-ming. Effect of residual chirp on ultrashort pulse width measured with autocorrelation method[J]. LASER TECHNOLOGY, 2010, 34(6): 789-793. DOI: 10.3969/j.issn.1001-3806.2010.06.019

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

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

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Received Date: November 01, 2009
Revised Date: May 04, 2010
Published Date: November 24, 2010

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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.
- measurement and metrology,
- ultrafast optics,
- second harmonic autocorrelation,
- residual chirp,
- measurement of pulse width

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