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Characterization Ultrashort Pulses Using Second Harmonic Generation Frequency-Resolved Optical Gating Technique

Author: LiWenBin
Tutor: QuShiLiang；LiuWenJun
School: Harbin Institute of Technology
Course: Optics
Keywords: Femtosecond laser SPIDER SHG FROG BBO Delay means
CLC: TN249
Type: Master's thesis
Year: 2008
Downloads: 51
Quote: 0
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Abstract


Femtosecond laser pulse has the characteristics of high-power , ultrashort pulse duration , is widely used in the fields of physical , chemical , biological and atmospheric sounding characterization of femtosecond pulses , and thus how to become a more important issue . Currently, the method for measuring ultrashort pulse frequency-resolved optical shutter method (FROG) and spectral phase interferometry for direct electric field reconstruction method ( SPIDER) . FROG and SPIDER the advantages of the measuring method is may be directly from the measurement data obtained in the reconstructed amplitude and phase information of the femtosecond pulse . This article describes the basic principles of the SPIDER and FROG measurement of ultrashort pulse , numerical simulation of the SPIDER and the second harmonic frequency - resolved optical shutter method (SHG FROG) measurement of ultrashort pulse phase and intensity structures SHG FROG measurement device , the experimentally measured titanium gem femtosecond laser system (Coherent Inc.) output ultrashort pulse FROG trace Figure FROG reconstruction process inverse phase and intensity distribution of femtosecond pulses . The main work includes the following aspects : 1 . Based on the SPIDER experimental principles and algorithms export a discrete phase expressions , numerical simulation SPIDER measurement of ultrashort pulse phase , using a discrete phase expression reconstruct the pulse phase information . Detailed discussion the the FROG measurement principle , the algorithm focused on the principles and algorithms for the second harmonic frequency resolved optical shutter method (SHG FROG) Experimental and numerical simulation SHG FROG measuring the intensity and phase of ultrashort pulses . Discussed experimental apparatus , the time delay line principle , and produced a delay device , BBO transmittance nonlinear efficiency , choose BBO as experimental frequency doubling crystal , describes the basic features of the spectrometer , using the spectrometer acquisition The SHG FROG signal . 4. Built the SHG FROG measuring ultrashort pulse system , and use it to measure Ti femtosecond laser system output in time domain bandwidth 120fs about the center wavelength of 800nm ??near the ultrashort pulse , generated SHG FROG trace FIG final reconstructed ultrashort pulse intensity and phase information.

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