Experimental comparison of conventional pulse characterisation techniques and second-harmonic-generation frequency-resolved optical gating

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• 作者：Penman ; Z.E. ; Schittkowski ; T. ; et. al.
• 关键词：42.55.R ; 42.65.R ; 06.60.J ; 78.47 ; 42.60.F
• 刊名：Optics Communications
• 出版年：1998
• 出版时间：October 15, 1998
• 年：1998
• 卷：155
• 期：4-6
• 页码：297-300
• 全文大小：1.43 M

文摘

Conventional methods to characterise the output of modelocked lasers rely on phase-sensitive intensity measurements in the time domain (interferometric autocorrelation) and power measurements in the frequency domain. We describe a full comparison between measurements made using second-harmonic-generation frequency-resolved optical gating (FROG) and those made independently with a conventional autocorrelator and spectrometer. Our measurements of pulses from a self-modelocked Ti:sapphire laser operated throughout the region of net negative intracavity dispersion show that pulse durations inferred from autocorrelation measurements by assuming a sech²(t) pulse intensity profile are consistently lower than those determined by the general FROG technique.