Oscillators – Molecular or particle resonant type
Patent
1975-06-23
1976-08-31
Webster, Robert J.
Oscillators
Molecular or particle resonant type
357 16, 357 18, H01s 319
Patent
active
039784282
ABSTRACT:
A buried-heterostructure (BH) diode injection laser capable of operating at low room temperature thresholds and in the lowest order TE, TM or TEM modes. The laser has an elongated groove in a substrate with the groove extending through a pump current confining layer with a central portion of the active layer substantially completely within the groove and substantially completely surrounded by light guiding and carrier confining layers of material having a lower index of refraction than the index of refraction of the material of the active layer. The light guiding and carrier confining layer in contact with the substrate has a central depression within the elongated groove and the central portion of the active layer is bowl-shaped and within the depression such that light waves produced by carrier recombination within the central portion of the active layer when the laser is forward biased are guided in the central portion of the active layer such that the laser produces a light beam having reduced width v. height dimensional variations such that the light beam can be used with symmetrical optical elements such as round lenses.
REFERENCES:
patent: 3780358 (1973-12-01), Thompson
patent: 3783351 (1974-01-01), Tsukada et al.
patent: 3824493 (1974-07-01), Hakki
patent: 3849790 (1974-11-01), Gottsman
patent: 3920491 (1975-11-01), Yonezu
casey et al., Journal of Applied Physics, vol. 45, No. 1, Jan., 1974, pp. 322-333.
Tsukada, Journal of Applied Physics, vol. 45, No. 11, Nov., 1974, pp. 4899-4906.
Burnham Robert D.
Scifres Donald R.
Anderson T. J.
Colitz, Jr. M. J.
Webster Robert J.
Xerox Corporation
Zalman Leonard
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