Laser diode operated in hybrid modulation modes

Details Laser diode operated in hybrid modulation modes Laser diode operated in hybrid modulation modes

1993-05-17

1994-06-28

Epps, Georgia Y.

Coherent light generators

Particular beam control device

Modulation

372 9, 372 38, 372 29, 346108, H01S 310

Patent

active

053253833

ABSTRACT:
A laser imaging apparatus includes a laser diode which is controlled to produce a laser beam the power of which varies linearly as a function of a digital image input signal. The laser beam is deflected by scanning optics to expose photosensitive media such as film. When the digital image input signal is in a first range of values to operate the laser diode in its linear region, the laser diode is controlled to operate in an amplitude modulation mode. When the digital image input signal is in a second, lower, range of values which would operate the laser diode in its non-linear operating region, the laser diode is controlled to operate in the linear region but in a pulse amplitude modulation mode.

REFERENCES:
patent: 4375065 (1983-02-01), Ohara
patent: 4679057 (1987-07-01), Hamada
patent: 4754291 (1988-06-01), Horikawa
patent: 4774710 (1988-09-01), Davis et al.
patent: 4799069 (1992-01-01), Sasaki et al.
patent: 4806946 (1989-02-01), Ohnishi
patent: 4905022 (1990-02-01), Nagasawa
patent: 4987426 (1991-01-01), Ota et al.
"Uniform Perceptual Quantization: Applications to Digital Radiography," M. I. Sezan, K. Yip, S. J. Daly, IEEE Transactions on Systems, Man, and Cybernetics, vol. SMC-17, No. 4, Jul./Aug. 1987, pp. 622-634.

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