Design requirements of a pulsed ruby laser for an underwater holographic camera

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