Use of a PVDF pyroelectric sensor for beam mapping and profiling of a mid-infrared diode laser

Year: 2000

Authors: Toci G., Mazzoni M., Mazzinghi P.

Autors Affiliation: CNR, Istituto di Elettronica Quantistica, Firenze, Italy;
Istituto Nazionale di Ottica Largo E. fermi 6, 50125 Firenze, Italy

Abstract: A four-quadrant PVDF position sensor, originally designed for the alignment of mid-IR laser diodes beams, was also used for mapping and profiling the beam of a diode laser emitting few mu W at 5.8 mu m, by masking one quadrant with a 1 mm diameter pinhole or a 100 mu m width slit. This diagnostic system was used to optimize the laser collimating optics, determining a significant improvement in the spatial quality of the output beam, evaluated by means of the M-2 propagation factor. Since the laser diode modulation waveform required to optimize the pyroelectric detector responsivity is a fixed frequency square wave, quite different from that used in the normal spectroscopic application of the IR diodes, care was taken to have the same single-mode emission in the wavelength range of interest. The system was intended as a diagnostic and optimization tool for spectroscopic systems applied to environmental monitoring, but it may be used as a low cost device for the characterization of low power laser beams. (C) 2000 American Institute of Physics. [S0034-6748(00)04404-X].

Journal/Review: REVIEW OF SCIENTIFIC INSTRUMENTS

Volume: 71 (4)      Pages from: 1635  to: 1637

KeyWords: pyroelectric sensor
DOI: 10.1063/1.1150554

Citations: 2
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