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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 25, Iss. 5 — May. 1, 2008
  • pp: 794–800

Absorption saturation analysis of Cr 2 + : ZnSe and Fe 2 + : ZnSe

Huseyin Cankaya, Umit Demirbas, Ahmet K. Erdamar, and Alphan Sennaroglu  »View Author Affiliations


JOSA B, Vol. 25, Issue 5, pp. 794-800 (2008)
http://dx.doi.org/10.1364/JOSAB.25.000794


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Abstract

We propose several methods for the accurate determination of the cross sections of solid-state saturable absorbers and apply them to the analysis of polycrystalline Cr 2 + : ZnSe and Fe 2 + : ZnSe . In the case of Cr 2 + : ZnSe , both z-scan and power-dependent transmission measurements were made by using a continuous-wave fiber laser at 1800 nm and a pulsed optical parametric oscillator at 1570 nm . The average ground-state absorption cross sections at the wavelengths of 1800 and 1570 nm were determined to be 6.17 × 10 19 cm 2 and 2.24 × 10 19 cm 2 , respectively. Furthermore, the ratio of the cross sections at these wavelengths (2.75) was close to the value of 2.55 obtained from absorption spectrum measurements. Excited-state absorption was found to be negligible at both wavelengths. In the case of Fe 2 + : ZnSe , a tunable, pulsed Cr 2 + : ZnSe laser was used to obtain saturation data (z-scan and power-dependent saturation) at the wavelengths of 2645 and 2730 nm . Average ground-state absorption cross sections at 2645 and 2730 nm were determined to be 1.73 × 10 19 cm 2 and 2.47 × 10 19 cm 2 , respectively, again in very good agreement with those obtained from absorption spectrum measurements.

© 2008 Optical Society of America

OCIS Codes
(140.3540) Lasers and laser optics : Lasers, Q-switched
(140.3580) Lasers and laser optics : Lasers, solid-state
(160.3380) Materials : Laser materials
(160.6990) Materials : Transition-metal-doped materials

ToC Category:
Materials

History
Original Manuscript: January 3, 2008
Revised Manuscript: March 3, 2008
Manuscript Accepted: March 3, 2008
Published: April 28, 2008

Citation
Huseyin Cankaya, Umit Demirbas, Ahmet K. Erdamar, and Alphan Sennaroglu, "Absorption saturation analysis of Cr2+:ZnSe and Fe2+:ZnSe," J. Opt. Soc. Am. B 25, 794-800 (2008)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-25-5-794


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