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Title: Tunable, diode side-pumped Er: YAG laser

A discrete-element Er:YAG laser, side pumped by a 220 Watt peak-power InGaAs diode array, generates >500 mWatts at 2.94 .mu.m, and is tunable over a 6 nm range near about 2.936 .mu.m. The oscillator is a plano-concave resonator consisting of a concave high reflector, a flat output coupler, a Er:YAG crystal and a YAG intracavity etalon, which serves as the tuning element. The cavity length is variable from 3 cm to 4 cm. The oscillator uses total internal reflection in the Er:YAG crystal to allow efficient coupling of the diode emission into the resonating modes of the oscillator. With the tuning element removed, the oscillator produces up to 1.3 Watts of average power at 2.94 .mu.m. The duty factor of the laser is 6.5% and the repetition rate is variable up to 1 kHz. This laser is useful for tuning to an atmospheric transmission window at 2.935 .mu.m (air wavelength). The laser is also useful as a spectroscopic tool because it can access several infrared water vapor transitions, as well as transitions in organic compounds. Other uses include medical applications (e.g., for tissue ablation and uses with fiber optic laser scalpels) and as part of industrial effluent monitoring systems.
Inventors:
 [1];  [2]
  1. (Bellevue, WA)
  2. (Modesto, CA)
Issue Date:
OSTI Identifier:
870913
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
Patent Number(s):
US 5623510
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
tunable; diode; side-pumped; yag; laser; discrete-element; pumped; 220; watt; peak-power; ingaas; array; generates; 500; mwatts; 94; nm; range; near; 936; oscillator; plano-concave; resonator; consisting; concave; reflector; flat; output; coupler; crystal; intracavity; etalon; serves; tuning; element; cavity; length; variable; cm; total; internal; reflection; allow; efficient; coupling; emission; resonating; modes; removed; produces; watts; average; power; duty; factor; repetition; rate; khz; useful; atmospheric; transmission; window; 935; air; wavelength; spectroscopic; tool; access; infrared; water; vapor; transitions; organic; compounds; medical; applications; tissue; ablation; fiber; optic; scalpels; industrial; effluent; monitoring; systems; output coupler; yag laser; tuning element; internal reflection; medical applications; organic compound; repetition rate; water vapor; organic compounds; fiber optic; average power; diode array; total internal; cavity length; allow efficient; nm range; monitoring systems; duty factor; efficient coupling; /372/

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