The practical implementation of wavelength compensation in a portable underwater holographic camera is primarily intended to provide a facility for the inspection and metrology of subsea installations within the offshore oil and gas industries. Stability requirements dictate that the camera should incorporate a pulsed laser source. The choice of a suitable source is considerably limited by the requirement that the recording and replay wavelengths comply with the condition for wavelength compensation. The authors consider the design aspects of a pulsed ruby laser that is used in the development of the camera.
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