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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1996),
  • paper CFE1

Recent progress in Cr4+ lasers

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Abstract

Since the discovery of laser action in Cr: forsterite in 1988, there have been a series of new tunable solid-state lasers developed based on the Cr4+ ion. In contrast to the more common Cr3+-based lasers, the Cr4+ lasers operate at longer wavelengths, currently extending from about 1.1 to 1.9 μm. The cw output powers of these lasers has exceeded 2 W for room- temperature operation when pumped by a 7 W NdfYAG laser. In addition to providing a new broadly tunable spectroscopic source, these lasers have been mode-locked to generate femtosecond pulses, and may possibly serve as optical amplifiers. There are some constraints that need to be improved, however, before the Cr4+ lasers become widely used. These constraints include significant nonradiative relaxation of excited states, relatively low gain/length, and limited tuning ranges due to excited-state absorption.

© 1996 Optical Society of America

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