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

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-gener...

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Bibliographic Details
Published in:Optics communications 1998-10, Vol.155 (4), p.297-300
Main Authors: Penman, Z.E, Schittkowski, T, Sleat, W, Reid, D.T, Sibbett, W
Format: Article
Language:English
Subjects:
Doped-insulator lasers and other solid state lasers
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
High-speed techniques (microsecond to femtosecond)
Laboratory procedures
Lasers
Metrology, measurements and laboratory procedures
Nonlinear optics
Optics
Physics
Ultrafast processes
optical pulse generation and pulse compression
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Summary: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 sech 2( t) pulse intensity profile are consistently lower than those determined by the general FROG technique.
ISSN:0030-4018
1873-0310
DOI:10.1016/S0030-4018(98)00393-9