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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 33 — Nov. 20, 1999
  • pp: 6904–6911

Kilohertz pulse repetition frequency slab Ti:sapphire lasers with high average power (10 W)

William J. Wadsworth, David W. Coutts, and Colin E. Webb  »View Author Affiliations


Applied Optics, Vol. 38, Issue 33, pp. 6904-6911 (1999)
http://dx.doi.org/10.1364/AO.38.006904


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Abstract

High-average-power broadband 780-nm slab Ti:sapphire lasers, pumped by a kilohertz pulse repetition frequency copper vapor laser (CVL), were demonstrated. These lasers are designed for damage-free power scaling when pumped by CVL’s configured for maximum output power (of order 100 W) but with poor beam quality (M2 ∼ 300). A simple Brewster-angled slab laser side pumped by a CVL produced 10-W average power (1.25-mJ pulses at 8 kHz) with 4.2-ns FWHM pulse duration at an absolute efficiency of 15% (68-W pump power). Thermal lensing in the Brewster slab laser resulted in multitransverse mode output, and pump absorption was limited to 72% by the maximum doping level for commercially available Ti:sapphire (0.25%). A slab laser with a multiply folded zigzag path was therefore designed and implemented that produced high-beam-quality (TEM00-mode) output when operated with cryogenic cooling and provided a longer absorption path for the pump. Excessive scattering of the Ti:sapphire beam at the crystal surfaces limited the efficiency of operation for the zigzag laser, but fluorescence diagnostic techniques, gain measurement, and modeling suggest that efficient power extraction (>15 W TEM00, >23% efficiency) from this laser would be possible for crystals with an optical quality surface polish.

© 1999 Optical Society of America

OCIS Codes
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.3590) Lasers and laser optics : Lasers, titanium
(140.3600) Lasers and laser optics : Lasers, tunable
(140.6810) Lasers and laser optics : Thermal effects

History
Original Manuscript: April 14, 1999
Revised Manuscript: August 26, 1999
Published: November 20, 1999

Citation
William J. Wadsworth, David W. Coutts, and Colin E. Webb, "Kilohertz pulse repetition frequency slab Ti:sapphire lasers with high average power (10 W)," Appl. Opt. 38, 6904-6911 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-33-6904

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