Coherent light generators – Particular beam control device – Having particular beam control circuit component
Patent
1988-04-19
1989-05-09
LaRoche, Eugene R.
Coherent light generators
Particular beam control device
Having particular beam control circuit component
372 31, 372 32, 250239, 250552, 250578, 356326, H01S 313, H01J 502, G01J 328
Patent
active
048295337
ABSTRACT:
The present invention is a regulator circuit for combined regulation of the emitted wavelength from a laser diode, and its output. According to the invention, a fraction of the radiation from the laser diode (1) is caused to be transmitted, via a glass fibre (2) to a sensor unit (8). The sensor unit contains a dispersing device (3), possibly separate focussing devices, and a detector unit (4). The detector unit (4) contains one or more detector elements, whose electrical output signals are conducted to a signal decoding unit (5). The signal decoding unit (5) is connected (i) to a temperature generator (6), in turn connected by thermal means to the laser diode, (ii) to a power generator (7) which is electrically connected to the laser diode. By using a concave lattice as the dispersing device, the reflective radiation from the lattice (3) is focussed on to the detector elements in the detector unit. By placing two detector units close together, side by side, and having the radiation focussed on the detector units adjusted such that the radiation beam, at the correct wavelength, hits the detector elements in equal measure, balanced electrical signals from the detector elements are obtained, any differential controlling the temperature generator (6), and the sum of which controls the power generator (7).
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Smith, Circuits Devices and Systems, 2nd Ed., 1971, 465-466.
Hallberg Bengt O.
Rislund Sten H.
LaRoche Eugene R.
Shingleton Michael B.
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