Short-wavelength laser element doped with rare earth ions, optic

Details Short-wavelength laser element doped with rare earth ions, optic Short-wavelength laser element doped with rare earth ions, optic

1996-03-05

1997-08-19

Scott, Jr., Leon

Coherent light generators

Short wavelength laser

372 6, 372 41, 372 70, H01S 330

Patent

active

056595581

ABSTRACT:
A first pumping beam at a wavelength of 1210 nm emitted from a first pumping source is focused by a first lens system on an optical fiber. A second pumping beam at a wavelength of 650 nm emitted from a second pumping source passes through a coupler and a second lens system and arrives at the optical fiber to be incident thereon. Tm ions with which a core portion of the optical fiber is doped sequentially experience a ground-state level absorption transition upon absorption of the first pumping beam, an excited-state level absorption transition to an upper laser level upon absorption of the second pumping beam, and a radiative transition from the upper laser level to a ground-state level, thereby emitting light at a wavelength of 460 to 500 nm. The light at a wavelength of 460 to 500 nm emitted from the Tm ions is resonated by a resonator consisting of an incident mirror and an emitting mirror and outputted as a laser beam.

REFERENCES:
patent: 5299215 (1994-03-01), Thrash et al.
patent: 5381433 (1995-01-01), Esterowitz et al.
patent: 5388110 (1995-02-01), Snitzer
patent: 5488624 (1996-01-01), Thrash et al.
J.Y. Allain et al., "Blue Upconversion Fluorozirconate Fibre Laser", Electronics Letters, Feb. 1, 1990, pp. 166-167, vol. 26, No. 3, An Abstract of this reference can be found on p. 4 of the Specification.
S.G. Grubb et al., "CW Room-Temperature Blue Upconversion Fibre Laser" Electronics Letters, Jun. 18, 1992, pp. 1243-1244, vol. 28, No. 13. An Abstract of this reference can be found on p. 4 of the Specification.

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