ABSTRACT
Theoretical consideration of the process of forming a line image in an acousto-optical system with a pulsed laser shows that the quality of the reproduced information should be significantly influenced by such parameters of light radiation as the duration of the generation pulse and the divergence of laser radiation. The long duration of the generation pulse should lead to a decrease in the limiting number of solvable elements and a decrease in the contrast in the image of the amplitude-modulated signals. The divergence of the laser radiation should correspond to the capabilities of the deflector used for the light emission along the frame. If an acousto-optical deflector is used in the system, it should be close to diffraction. In addition, for effective use of light power, the polarization of the laser radiation incident on the acousto-optical modulator must correspond to the eigenmode of the light wave propagating in the interaction medium (3.45)–(3.47). In addition to the requirements for radiation parameters, the laser itself must operate reliably and efficiently at
frequencies corresponding to the standard horizontal pulse repetition frequency, for example, 15.625 kHz for the SECAM system, and also have an external trigger from these line pulses. The development of a laser that meets all of the above requirements is the first task that must be solved when creating an information display device whose operation principle is based on the impulse method of forming a line. To solve this problem, the possibility of optimizing the parameters of a copper vapour laser was studied on the basis of the sealed-off gas-discharge active elements (Kulon, Kulon-CM, Kristall, etc.), produced by the domestic industry, with reference to the television display system information.
