Coherent light generators – Particular component circuitry – Optical pumping
Patent
1991-04-03
1992-01-14
Epps, Georgia
Coherent light generators
Particular component circuitry
Optical pumping
372 26, 372 29, 372 9, 372 8, H01S 300
Patent
active
050816314
ABSTRACT:
A radiographic printer has a laser diode light source which is directly modulated by an input image signal. The laser diode has two operating regions, a linear laser region and a non-linear low-level light emitting region. The laser diode is amplitude modulated in the lasing region and is pulse width modulated in the light emitting region. A programmable digital delay produces the pulse width modulating signal and a digital comparator determines whether the laser diode operates in the amplitude modulation mode or the pulse width modulation mode. A current steering circuit is used in the pulse width modulation mode to rapidly switch the diode on and off. In addition, programmable digital to analog converters are used to compensate for changes in different diode slope efficiencies and threshold currents.
REFERENCES:
patent: 4774710 (1988-09-01), Davis et al.
patent: 4890288 (1989-12-01), Inuyanna et al.
patent: 4899348 (1990-02-01), Kiya et al.
patent: 5001717 (1991-03-01), Mayer et al.
Eastman Kodak Company
Epps Georgia
Noval William F.
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