Conclusion
We have demonstrated the modulation of laser around threshold for the observation of relaxation oscillations in a semiconductor diode laser. The oscillations frequency for the diode laser D1 was 1.5 kHz whereas the oscillations frequency corresponding to the laser from laser pointer D2 was 227 kHz. We have also observed the variation in damping time and relaxation frequency of both the lasers as a function ofx. In fact a classroom exercise can be taken up easily to do the parametric characterisation.
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Suggested Reading
O’ Svelto,Principle of Lasers, Plenum Press, fourth edition, 1998.
A E Seigman,Lasers, University Science book, California, 1986.
Chow Koch Sargent III,Semiconductor Laser Physics, Springer-Verlag, 1994.
Alika Khare, Pulsed laser operation of a CW laser,Electronics For You Vol. 33, No. 2, pp. 88–89, February 2001.
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Mishra, S., Khare, A. A simple laboratory experiment for studying the relaxation oscillations in a diode laser. Reson 9, 55–66 (2004). https://doi.org/10.1007/BF02834308
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DOI: https://doi.org/10.1007/BF02834308