Frequency and output regulation in laser diodes

Details Frequency and output regulation in laser diodes Frequency and output regulation in laser diodes

H - Electricity

01

S

325/1

H01S 5/024 (2006.01) H01S 5/0683 (2006.01) H01S 5/0687 (2006.01)

Patent

CA 1232326

ABSTRACT OF THE DISCLOSURE The present invention is a regulator circuit for combined regul- ation 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 conn- ected 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).

477892

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