Coherent light generators – Particular component circuitry – Optical pumping
Patent
1993-01-28
1997-02-18
Healy, Brian
Coherent light generators
Particular component circuitry
Optical pumping
372 36, 372 28, 372 26, H01S 3103
Patent
active
056047592
ABSTRACT:
A drive circuit drives an electronic device that converts electric power into light or heat energy. The drive circuit has a switch connected to the electronic device in series, and a control circuit for providing, in response to an input control signal, a pulse modulation signal for controlling the switch. The frequency of the pulse modulation signal is higher than the response frequency of the electronic device. Alternatively, the drive circuit may have first to fourth switches disposed on both sides of the electronic device, for passing a current in different directions through the electronic device, and a control circuit for controlling the switches to change the direction and magnitude of the average of the current flowing through the electronic device in response to an input control signal.
REFERENCES:
patent: 4514666 (1985-04-01), Suzuki
patent: 4594541 (1986-06-01), Schott
patent: 4816726 (1989-03-01), Novis et al.
patent: 5021936 (1991-06-01), Nishizawa et al.
patent: 5287372 (1994-02-01), Ortiz
Miyaki Yuji
Shima Michikazu
Fujitsu Limited
Healy Brian
McNutt Robert
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