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Optical Engineering

Two Photon Absorption, Nonlinear Refraction, And Optical Limiting In Semiconductors
Author(s): Eric W. Van Stryland; H. Vanherzeele; M. A. Woodall; M. J. Soileau; Arthur L. Smirl; Shekhar Guha; Thomas F. Boggess
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Paper Abstract

Two-photon absorption coefficients /32 of ten direct gap semiconductors with band-gap energy Eg varying between 1 .4 and 3.7 eV were measured using 1.06 µm and 0.53 um picosecond pulses. $2 was found to scale as E43, as predicted by theory for the samples measured. Extension of the empirical relationship between $2 and Eg to InSb with Eg = 0.2 eV also provides agree-ment between previously measured values and the predicted 02. In addition, the absolute values of $2 are in excellent agreement (the average difference being <26%) with recent theory, which includes the effects of nonparabolic bands. The nonlinear refraction induced in these materials was monitored and found to agree well with the assumption that the self-refraction originates from the two-photon-generated free carriers. The observed self-defocusing yields an effective nonlinear index as much as two orders of magnitude larger than CS2 for comparable irradiances. This self-defocusing, in conjunction with two-photon absorption, was used to construct a simple, effective optical limiter that has high transmission at low input irradiance and low transmission at high input irradiance. The device is the optical analog of a Zener diode.

Paper Details

Date Published: 1 August 1985
PDF: 11 pages
Opt. Eng. 24(4) doi: 10.1117/12.7973538
Published in: Optical Engineering Volume 24, Issue 4
Show Author Affiliations
Eric W. Van Stryland, North Texas State University (United States)
H. Vanherzeele, North Texas State University (United States)
M. A. Woodall, North Texas State University (United States)
M. J. Soileau, North Texas State University (United States)
Arthur L. Smirl, North Texas State University (United States)
Shekhar Guha, North Texas State University (United States)
Thomas F. Boggess, North Texas State University (United States)

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