Coherent light generators – Particular active media – Semiconductor
Patent
1995-03-21
1996-11-12
Davie, James W.
Coherent light generators
Particular active media
Semiconductor
372 45, H01S 319
Patent
active
055747434
ABSTRACT:
Semiconductor diode lasers are used inter alia in optical disc systems, laser printers, bar code readers, and glass fibre communication systems. Lasers having a so-called (weakly) index-guided structure are very suitable for many applications inter alia because they can be manufactured comparatively simply and reliably. A disadvantage of the known (weakly) index-guided laser is that the so-called P-I (=optical power-current) characteristic thereof exhibits a kink. Such a kink limits the use of the laser to a relatively low optical power. According to the invention, such a (weakly) index-guided laser has a resonance cavity with a length for which the optical power at which a kink occurs in the P-I characteristic is a maximum. It was a surprise to find that the occurrence of a kink in the P-I curve of such a (weakly) index-guided laser depends on the length of the resonance cavity. Very surprising is the appearance of a maximum value in this kink power as a function of the length of the resonance cavity. Equally surprising is the occurrence of a series of such maxima, which are substantially equally high, and which are formed by the crests of a sawtooth curve with a very steep flank at the rising edge to each maximum. As a result, the laser length may be optimized not only in relation to the occurrence of kinks in the P-I characteristic but also in relation to other properties. The invention also relates to a method of manufacturing a laser according to the invention, which preferably includes a ridge waveguide structure.
REFERENCES:
patent: 5027362 (1991-06-01), Hokanson et al.
"Heterostructure Lasers, Part B: Materials and Operating Characteristics" by H. C. Casey and M. B. Panish, Academic Press 1978, Ch. 7.6, pp. 207-217. (no month).
"Effect of Cavity Length on Stripe-Geometry DH Laser Output" by R. T. Lynch, Jr., M. B. Small & R. Y. Hung, Appl. Phys. Lett 34(4), 15 Feb. 1979 .
Acket Gerard A.
Schemmann Marcel F. C.
van der Poel Carolus J.
Biren Steven R.
Davie James W.
U.S. Philips Corporation
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