Demonstration of interference and laser generation instabilities in semiconductor laser beam reflected from glass plate

A simple scheme of two-beam interference is presented in the work. It includes glass plate of thickness 1-2 mm and laser beam focused on it (focusing by a collecting lens with focal distance of about 10 cm). Observations of interference in reflected light were conducted at a remote screen placed at...

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Bibliographic Details
Main Authors: Makovetsky, E.D., Ageev, L.A., Miloslavsky, V.K., Beloshenko, K.S.
Format: Conference Proceeding
Language:English
Subjects:
Chaos
Glass
instability of laser generation spectrum
Interference
laser beam
Laser beams
Laser theory
Lenses
Light sources
Optical interferometry
Physical optics
Semiconductor lasers
two-beam interference
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Summary:A simple scheme of two-beam interference is presented in the work. It includes glass plate of thickness 1-2 mm and laser beam focused on it (focusing by a collecting lens with focal distance of about 10 cm). Observations of interference in reflected light were conducted at a remote screen placed at distance of several meters away. The formula for interference pattern period has been deduced for such a case. It has been shown that the scheme is good for educational demonstrations of interference. Besides, it has been shown that, provided the light source is a semiconductor laser with unstable generation spectrum, generation instability is revealed through interference pattern observations. Thus a simple but high-quality method of detecting laser generation instabilities is proposed.
DOI:10.1109/LFNM.2008.4670370