Coherent light generators – Particular resonant cavity – Specified cavity component
Patent
1991-04-22
1992-08-11
Davie, James W.
Coherent light generators
Particular resonant cavity
Specified cavity component
372 43, 372 92, 372 97, H01S 308
Patent
active
051386283
ABSTRACT:
The disclosure relates to the making of lasers. It is sought to obtain a laser that emits at only one frequency without using frequency selection means (such as filters, etc.) needed in certain types of spectral wideband lasers (vibronic type lasers for example). It is also sought to make the laser tunable by simple means. To achieve these goals, it is proposed to define a laser cavity in which one of the mirrors is not a standard mirror but a mirror with an active function in the sense that it does not merely reflect light but itself produces light at only one wavelength. The active mirror is preferably a Bragg reflector made with an alternation of layers, at least one of which is a semiconductor layer. This layer collects electron-hole pairs in response to the excitation by the fluorescence photons. It re-emits photons at a wavelength determined by the forbidden band width of the semiconductor. The choice of the types of composition and thicknesses of the layers is contrived so that there is coincidence between the re-emitted wavelength and a peak of reflectivity of the Bragg mirror. The laser may be made tunable by the appropriate positioning of a mirror region having a peak of reflectivity at a desired frequency.
REFERENCES:
patent: 4800568 (1989-01-01), Krueger et al.
patent: 4856019 (1989-08-01), Miyata et al.
Electronics Letters, vol. 24, No. 4, Onta et al. "All-Optical Active . . . " pp. 216-217.
Applied Physics Letters, vol. 50, No. 18, May 1987, Gourley et al. "Visible, Room . . . " pp. 1225-1227.
Electronics Letters, vol. 24, No. 10, May 1988, J. Faist et al. "Optically Pumped GaAs . . . " pp. 629-630.
Applied Physics Letters, vol. 51, No. 23, P. L. Gourley et al., "Optical Bleaching in an Epitaxial . . . " pp. 1395-1397.
Applied Physics Letters, vol. 51, No. 23, G. W. Yoffe et al. "Modulation of Light By . . . " pp. 1876-1878.
Papuchon Michel
Pocholle Jean-Paul
"Thomson-CSF"
Davie James W.
Plottel Roland
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