Semiconductor laser apparatus for optical head

Details Semiconductor laser apparatus for optical head Semiconductor laser apparatus for optical head

1987-04-22

1988-09-20

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250216, 357 19, G11B 712

Patent

active

047727845

ABSTRACT:
A semiconductor laser apparatus having a semiconductor laser diode for radiating a laser beam, a photodetector formed on a semiconductor substrate, a prism having a first plane for introducing the laser beam to a reflecting substance and introducing the beam reflected by the reflecting substance to the photodetector and a second plane facing to the photodetector, and a coating layer formed on the boundary between the semiconductor substrate and the prism, having a refractive index such that the laser beam incident from the first plane other than the laser beam reflected by the reflecting substance is inhibited from reaching the photodetector.

REFERENCES:
patent: 3513316 (1970-05-01), Hirschfeld
patent: 3969751 (1976-07-01), Drukaroff et al.
patent: 4334300 (1982-06-01), Arquie et al.

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