Title

Optical Spectroscopy Of Cr4+:Y2Sio5

Abstract

Spectroscopic data on the absorption and the fluorescence spectra and fluorescence lifetimes are presented for Cr4+:Y2SiO5, the newest Cr4+ -doped laser crystal. The fluorescence measurements were conducted at temperatures ranging from 10 to 310 K, and the absorption spectra were measured at room temperature and 77 K. Spectroscopic analysis of the absorption and the emission spectra is performed on the basis of a distorted tetrahedral symmetry for the Cr4+ site, namely C3v. The tetravalent chromium substitutes for Si4+ in this crystal, and there is no evidence for the presence of chromium in any other valence state. The Cr4+ site is characterized by strong crystal field parameters. We have tentatively assigned the sharp line at 1146 nm in the lowtemperature fluorescence spectrum (excited by 1064-nm radiation) to the spin-forbidden singlet-to-triplet transition 1E3A2, and the broad band with the peak at 1225 nm to the spin-allowed 3T23A2 transition. Excitation at 532 nm results in an additional type of emission in the near infrared. A similar dependence of the lasing wavelength on the pump wavelength was observed in the laser operation of the crystal at 77 K [Chai et al., in Advanced Solid-State Lasers, L. L. Chase and A. A. Pinto, eds., Vol. 13 of OSA Proceedings Series (Optical Society of America, Washington, D.C., 1992), pp. 28-30]. © 1993 Optical Society of America.

Publication Date

1-1-1993

Publication Title

Journal of the Optical Society of America B: Optical Physics

Volume

10

Issue

9

Number of Pages

1499-1507

Document Type

Article

Identifier

scopus

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/JOSAB.10.001499

Socpus ID

84975633751 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84975633751

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