[IEEE CAOL'2003. 1st International Conference on Advanced Optoelectronics and Lasers. Jontly with 1st Workshop on Precision Oscillations in Electronics and Optics (IEEE Cat. No.03EX715) - Alushta, Crimea, Ukraine (16-20 Sept. 2003)] Proceedings of CAOL'2003. 1st International Conference on Advanced Optoelectronics and Lasers. Jontly with 1st Workshop on Precision Oscillations in Electronics and Optics (IEEE Cat. No.03EX715) - The appreciation of the influence of exactness of focusing on the work of the laser homodyne method of measuring the parameters of vibration