Angularly resolved autocorrelation for single-shot time-frequency imaging of ultrashort light pulse

Kabelka, V.; Masalov, A. V.

doi:10.1016/0030-4018(95)00448-2

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…12, the direction of the SH beam changes as a function of delay between the fundamental pulses. This phenomenon is utilized in the chirp measurement by angle-resolved autocorrelation [70], [71].…”

Section: Spatial Filtering Of the Sh Beammentioning

confidence: 99%

Second-harmonic generation frequency-resolved optical gating in the single-cycle regime

Baltuška

Pshenichnikov

Wiersma

1999

IEEE J. Quantum Electron.

125

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The problem of measuring broad-band femtosecond pulses by the technique of second-harmonic generation frequency-resolved optical gating (SHG FROG) is addressed. We derive the full equation for the FROG signal, which is valid even for single-optical-cycle pulses. The effect of the phase mismatch in the second-harmonic crystal, the implications of the beam geometry, and the frequency-dependent variation of the nonlinearity are discussed in detail. Our numerical simulations show that, under carefully chosen experimental conditions and with a proper spectral correction of the data, the traditional FROG inversion routines work well even in the single-cycle regime. The developed description of the SHG FROG signal was applied to measure the white-light continuum pulses in the spectral region of 500-1100 nm. The obtained spectral phase of these pulses served as a target function for the pulse compressor design. The pulses produced by compression around 800 nm were also characterized by SHG FROG. The resulting pulse duration measures 4.5 fs which corresponds to 2.5 optical cycles.

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Section: Spatial Filtering Of the Sh Beammentioning

confidence: 99%

Second-harmonic generation frequency-resolved optical gating in the single-cycle regime

Baltuška

Pshenichnikov

Wiersma

1999

IEEE J. Quantum Electron.

125

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“…This means that the second-harmonic beam produced in the autocorrelator is converted by the optical setup into a two-dimensional image where the vertical coordinate y stands for time t and the horizontal one x - for instantaneous frequency Ω. The following relations give the scales [4]:…”

Section: Theorymentioning

confidence: 99%

“…Ultrashort light pulse characterization, which in general includes determination of the temporal dependence of the instantaneous frequency (chirp) or, equivalently, spectral phase, is a difficult and complicated task [1][2][3][4][5][6][7][8][9][10][11][12][13]. Our previous theoretical analysis has shown that the well-known nonlinear autocorrelator based on noncolinear second-harmonic generation (SHG) [13], in addition to pulse duration measurements, can provide measurements of the chirp of a fs pulse [2,4,13]. The SHG autocorrelation method has been verified experimentally with femtosecond pulses produced by the Ti:sapphire laser system based on the Colliding Pulse Amplification (CPA) scheme [7].…”

Section: Introductionmentioning

confidence: 99%

Simple ultrashort light pulse chirp measurement device

Kabelka¹

2005

Lith. J. Phys.

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A simple device, Frequency Tracer (FT), for simultaneous measurement of ultrashort light pulse duration and chirp is presented. FT operation is based on the two-dimensional image analysis (time versus frequency) of the non-colinear secondharmonic autocorrelator beam, and FT enables one to evaluate the temporal phase variation over the femtosecond pulse duration. The spectral information of a fs pulse in FT originates from the angular divergence of a second-harmonic signal beam, and there is no need to use the spectral apparatus. Femtosecond pulses duration and chirp measurements of the Ti:sapphire laser system multi-pass amplifier (MPA) during adjustment of the compressor pair of gratings were made.

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