Semiconductor laser and optical pickup with the same

Details Semiconductor laser and optical pickup with the same Semiconductor laser and optical pickup with the same

1998-06-24

2000-09-19

Lee, John D.

Coherent light generators

Particular resonant cavity

372 43, 372 99, H01S 514

Patent

active

061223042

ABSTRACT:
An optical pickup has a semiconductor laser that emits a laser beam to read information recorded on a storage medium. A length of an internal resonator of the semiconductor laser is set so as to satisfy a relationship of L.sub.A /(m+1)N<L<L.sub.A /mN where L.sub.A is a length of an external resonator constituted by a beam outgoing surface of the semiconductor laser and a beam reflecting surface of the storage medium, L the length of the internal resonator, N an effective refractive index with respect to a waveguide in the semiconductor laser, and m a natural number. The length L.sub.A is set so as to satisfy a relationship of mNL<L.sub.A <(m+1)NL.

REFERENCES:
patent: 4528670 (1985-07-01), Burrus, Jr. et al.
patent: 4803692 (1989-02-01), Sakano et al.

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