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. 2012 Feb 1;106(2):379-384.
doi: 10.1007/s00340-011-4746-2. Epub 2011 Oct 11.

Cross-validation of theoretically quantified fiber continuum generation and absolute pulse measurement by MIIPS for a broadband coherently controlled optical source

H Tu  1 , Y Liu, J Lægsgaard, D Turchinovich, M Siegel, D Kopf, H Li, T Gunaratne, S A Boppart
Affiliations

Cross-validation of theoretically quantified fiber continuum generation and absolute pulse measurement by MIIPS for a broadband coherently controlled optical source

H Tu et al. Appl Phys B. .

Abstract

The predicted spectral phase of a fiber continuum pulsed source rigorously quantified by the scalar generalized nonlinear Schrödinger equation is found to be in excellent agreement with that measured by multiphoton intra-pulse interference phase scan (MIIPS) with background subtraction. This cross-validation confirms the absolute pulse measurement by MIIPS and the transform-limited compression of the fiber continuum pulses by the pulse shaper performing the MIIPS measurement, and permits the subsequent coherent control on the fiber continuum pulses by this pulse shaper. The combination of the fiber continuum source with the MIIPS-integrated pulse shaper produces compressed transform-limited 9.6 fs (FWHM) pulses or arbitrarily shaped pulses at a central wavelength of 1020 nm, an average power over 100 mW, and a repetition rate of 76 MHz. In comparison to the 229-fs pump laser pulses that generate the fiber continuum, the compressed pulses reflect a compression ratio of 24.

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Figures

Fig. 1
Fig. 1
Scheme for absolute pulse measurement by MIIPS. The background of the pulse measurement by the primary MIIPS-integrated pulse shaper (a) is obtained by the pulse compression in (b) and the subsequent measurement in (c) with the assistance of an auxiliary MIIPS-integrated pulse shaper
Fig. 2
Fig. 2
(a) Measured spectrum of fiber continuum source and the scalar GNLSE-quantified spectrum. (b) Comparison of the spectral phases corresponding to the uncompressed pulses, the scalar GNLSE-quantified fiber continuum pulses, the measured pulses, the background of the MIIPS-integrated pulse shaper, the compressed pulses, and the shaped pulses (see details in text). (c) Comparison of measured spectrum of fiber continuum source (before shaper) and measured spectrum of fiber continuum at the focus of the curved mirror (after shaper). (d) Reconstructed temporal profiles of the compressed pulses and the corresponding TL pulses. (e) Comparison of the measured and calculated SHG spectra of the uncompressed pulses. (f) Comparison of the measured SHG spectrum of the compressed pulses and the calculated SHG spectrum of the TL pulses, and of the measured and calculated SHG spectra of the shaped pulses
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