Collinear type II second-harmonic-generation frequency-resolved optical gating for use with high-numerical-aperture objectives

Journal Article · Wed Jul 01 00:00:00 EDT 1998 · Optics Letters

DOI:https://doi.org/10.1364/OL.23.001046· OSTI ID:638765

Fittinghoff, D N ^[1]; Squier, J A ^[2]; Barty, C P ^[1]; Sweetser, J N; Trebino, R ^[3]; Mueller, M ^[4]

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1. Institute for Nonlinear Science, University of California, San Diego, La Jolla, California 92093-0339 (United States)
2. Department of Electrical Engineering and Computer Science, University of California, San Diego, La Jolla, California 92093-0339 (United States)
3. Combustion Research, Sandia National Laboratories, Livermore, California 94551 (United States)
4. BioCetrum Amsterdam, Institute for Molecular Cell Biology, Kruislaan 316, 1098 SM Amsterdam (The Netherlands)

Ultrashort-pulse lasers are now commonly used for multiphoton microscopy, and optimizing the performance of such systems requires careful characterization of the pulses at the tight focus of the microscope objective. We solve this problem by use of a collinear geometry in frequency-resolved optical gating that uses type II second-harmonic generation and that allows the full N.A. of the microscope objective to be used. We then demonstrate the technique by measuring the intensity and the phase of a 22-fs pulse focused by a 20{times} , 0.4-N.A. air objective. {copyright} {ital 1998} {ital Optical Society of America}

• OSTI ID: 638765
• Journal Information: Optics Letters, Vol. 23, Issue 13; Other Information: PBD: Jul 1998
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
MULTI-PHOTON PROCESSES
PULSE ANALYZERS
GATING CIRCUITS
HARMONIC GENERATION
FOCUSING
OPTIMIZATION
OPTICAL MICROSCOPY