1 January 2001 Angle measurement by injection-detection in a laser diode
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We propose a new technique to measure the angle of a remote flat surface with respect to the propagation direction of a laser beam, based on injection detection in a laser diode. The surface under test acts as the remote mirror of an external cavity laser, and causes the laser diode to operate in the coherent collapse regime. The power emitted by the laser depends on the alignment of the remote surface, and an ac technique enables us to measure angle with a sensitivity of 0.1 arcsec (i.e., 5 x 10-7 rad). The attained performances are comparable to those of existing autocollimators, with the advantage of simplicity and compactness that makes the new technique interesting for the development of a measuring instrument.
© (2001) Society of Photo-Optical Instrumentation Engineers (SPIE)
Guido Giuliani, Silvano Donati, Marco Passerini, Thierry M. Bosch, "Angle measurement by injection-detection in a laser diode," Optical Engineering 40(1), (1 January 2001). https://doi.org/10.1117/1.1332276 . Submission:

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