## The role of nonlinear optical absorption in narrowband difference-frequency terahertz-wave generation

JOSA B, Vol. 27, Issue 2, pp. 222-227 (2010)

http://dx.doi.org/10.1364/JOSAB.27.000222

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### Abstract

We present a general analysis of the influence of nonlinear optical absorption on terahertz generation via optical-difference frequency generation when reaching for the quantum conversion efficiency limit. By casting the equations governing the process in a suitably normalized form, including either two-photon- or three-photon absorption terms, we have been able to plot universal charts for phase-matched optical-to-terahertz conversion for different values of the nonlinear absorption coefficients. We apply our analysis to some experiments reported to date in order to understand to what extent multiphoton absorption could have played a role and also to predict the maximum achievable conversion efficiency at higher peak pump intensities.

© 2010 Optical Society of America

**OCIS Codes**

(190.4180) Nonlinear optics : Multiphoton processes

(190.4410) Nonlinear optics : Nonlinear optics, parametric processes

(190.4970) Nonlinear optics : Parametric oscillators and amplifiers

(230.6080) Optical devices : Sources

**ToC Category:**

Nonlinear Optics

**History**

Original Manuscript: September 30, 2009

Revised Manuscript: October 29, 2009

Manuscript Accepted: November 6, 2009

Published: January 11, 2010

**Citation**

Matteo Cherchi, Saverio Bivona, Alfonso C. Cino, Alessandro C. Busacca, and Roberto L. Oliveri, "The role of nonlinear optical absorption in narrowband difference-frequency terahertz-wave generation," J. Opt. Soc. Am. B **27**, 222-227 (2010)

http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-27-2-222

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