Late in 1962 and in early 1963 plenty of research groups in the USA and the Soviet Union demonstrated the pioneer <a href="http://www.hotdiodelaser.com/">Laser Diode</a>. Since then, these tiny light-emitting semiconductor devices at the moment are an indispensible component of today’s technological infrastructure. Laser diodes are centrally necessary to modern telecommunications, data storage, and computing, and find applications among medical imaging to barcode readers.
The paper presents a simple and straightforward technique of determining the phase of an interferogram by exploiting the specified behavior of laser diodes—i. e., the small variation of the operating wavelength attainable by varying the forward current of this diode. The proposed procedure was developed by using a fractional laser diode for feeding a quasi-balanced Michelson <a href="http://www.hotdiodelaser.com/">Green Laser Pointers</a>, where by the optimal operating conditions were investigated—i. e., the proper unbalancing and then the proper variation of the supply voltage of the diode. The selected operating conditions were then raised for evaluating the phase-steps by a simple algorithm developed on purpose for ones present application. The phase measurements carried out by the proposed method have shown a good accordance with those obtained by a conventional temporal phase-shifting procedure performed by using a high-end commercial PZT actuator with quasi- nanometric accuracy.
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