Journal
IEEE JOURNAL OF QUANTUM ELECTRONICS
Volume 53, Issue 5, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2017.2744984
Keywords
Optical interferometers; measurements; optical feedback; semiconductor laser diodes
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In a self-mixing interferometer based on a diode laser, the measurement of the external reflector displacement s(t) is carried out by looking at the optical-phase signal cos 2ks(t), a signal readily detected as an amplitude modulation (AM) of emitted power. In contrast, the other available signal, sin2ks(t), a frequency modulation (FM) of the emitted field at optical frequency, is never used because difficult to recover. Recently, Contreras et al. used a narrow-band acetylene cell to convert the FM into an amplitude signal, finding it is larger and has a better SNR than the AM. In this paper, we analyze the advantages of the new CFM (converted-FM) signal, calculating both amplitude and SNR, and compare theoretical results to published experimental evidence, finding good agreement. We then present options for realizing the selective filter in different configurations and technology. Finally, we evaluate the improvement offered by CFM in a number of measurements, like sub-wavelength vibrations, digital readout displacement, and diode laser alpha factor.
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