Coherent light generators – Particular beam control device – Tuning
Patent
1993-02-09
1994-10-18
Epps, Georgia Y.
Coherent light generators
Particular beam control device
Tuning
372 29, 372 31, 372 32, 372 25, 372 93, 372 94, 372 69, 372 71, H01S 310
Patent
active
053575326
ABSTRACT:
To provide a wavelength tunable laser device having a wavelength variable range of a broad band, and capable of simply changing the output wavelength. Excitation means 1 excites a laser medium 2a in a main resonator 2. The main resonator 2 is provided with two resonator mirrors 2b and an optical input/output port 2c in addition to the laser medium 2a. By the excitation means 1 and the main resonator 2, laser oscillation can be produced. A sub-resonator 3 is provided with wavelength selection means 3a and optical feedback means 3b. And, the sub-resonater selects a desired wavelength of the laser beam outputted from said main resonator and returns the laser beam of the desired wavelength back to said laser medium. In a device comprising the excitation means 1, the main resonator 2 and the sub-resonator 3, an optical output port 4 is provided. Since this wavelength tunable laser device has no necessity of providing wavelength selection means within the main resonator, laser oscillation is easily produced. Accordingly, even in the case where the gain of the laser medium is small, or the excitation energy is small, oscillation can be produced. In addition, since the main resonator can be placed in an oscillating state at all times, the wavelength tunable laser device can be prevented from being stopped.
REFERENCES:
patent: 4707835 (1987-11-01), Mocker
IBM Technical Disclosure Bulletin, "Interferometric Dye Laser Wavelength Tuner", Zory, vol. 14, No. 3, Aug. 1971, p. 951.
Mitschke et al., "Stabilizing the Soiton Laser", 8106 I.E.E.E., Journal of Quantum Electronics, vol. QE-22, No. 12, Dec. 1986, pp. 2242-2250.
Aoshima Shinichiro
Ito Haruyasu
Epps Georgia Y.
Hamamatsu Photonics K.K.
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