Coherent light generators – Particular pumping means – Pumping with optical or radiant energy
Patent
1986-09-15
1989-02-28
Scott, Jr., Leon
Coherent light generators
Particular pumping means
Pumping with optical or radiant energy
372 4, 372 21, 372 22, 372 39, 372 34, H01S 3091
Patent
active
048092916
ABSTRACT:
A source of coherent blue light comprises a diode laser for pumping a Nd.sup.3+ doped member of lasant material disposed within an optical resonator for exciting the .sup.4 F.sub.3/2 -.sup.4 I.sub.9/2 laser transition of a wavelength within the range of 0.870 to 0.960 .mu.m. The laser radiation within the optical resonator is doubled by means of a doubler crystal of a non-linear, electro-optic material to produce blue light which is then extracted from the optical resonator as an output beam. A thermo-electric cooler is coupled in heat-exchanging relation with the Nd.sup.3+ doped laser material to improve the efficiency and the doubler crystal is temperature controlled for phase matching to the laser radiation within the range of 0.870 to 0.960 .mu.m. The diode pump laser is preferably either a GaAlAs or GaAs diode laser producing pumping radiation of a wavelength of approximately 0.810 .mu.m. In the case of Nd:YAG end pumped laser material, the laser material is preferably doped to have a high an absorption coefficient as possible and its length is chosen to be within the range of 0.5 to 3 mm. In one embodiment, the lasant material and the non-linear, electro-optic material are disposed in separate optical resonators with the laser resonator optically decoupled from the doubler resonator for inhibiting reflection of optical power back to the laser resonator.
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Byer Robert L.
Fan Tso Y.
Aine Harry E.
Board of Trustees, of Leland Stanford Jr U.
Jr. Leon Scott
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