Grating-tuned External Cavity Diode Lasers

Released on by Beate Stephan Falconer
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  • Grating-tuned External Cavity Diode Lasers Book Detail

  • Author : Beate Stephan Falconer
  • Release Date : 1994
  • Publisher :
  • Genre : Semiconductor lasers
  • Pages : 162
  • ISBN 13 :
  • File Size : 5,5 MB
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Grating-tuned External Cavity Diode Lasers by Beate Stephan Falconer PDF Summary

Book Description: Diode lasers have many advantages such as small size, high efficiency and small angular dispersion of the collimated beam. However they also have some problems like lack of frequency stability. They can not be tuned in wavelength. An external cavity can solve these problems and decrease the laser linewidth. To obtain a tunable, narrow linewidth light source, antireflection coatings were applied to commercial diode lasers which were then tested in an external cavity. Laser characteristics, such as threshold current, spectral behavior, I-V-curves, tuning range, and bandwidth were measured for the original diode laser and then compared to the measurements in an external cavity with and without antireflection (AR) coatings. The tuning range approximately doubled after AR coating. The modal stability was found to be better by a factor of 7 in the external cavity. The power amplification through the external cavity was as high as 50. It was also attempted to process laser diodes from material fabricated at OSU, however the resulting diodes showed a high series resistance and were not usable for this project. Additional work needs to be done in this area. The result of this work is a stable external cavity diode laser tunable over an 18 nm bandwidth which can be used as a tunable source in many applications.

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Annotation. - Presents a thorough account of the state-of-the-art of tunable external cavity diode lasers Provides an up-to-date survey on physics, technology,