ADJUSTMENT OF UNSTABLE CAVITIES USING A LIQUID-FILLED LASER CELL-BASED ON ORGANIC-DYE SOLUTIONS

This paper presents a technique for adjusting unstable cavities, using a laser liquid cell based on organic dyes, that guarantees that the c avity will be adjusted with an accuracy of 1 mu rad. The use of annula r beams of illumination radiation in the adjustment technique made it possible, by forming positive optical feedback, to simplify the proces s of bringing into coincidence the axis of the cavity to be adjusted a nd the axis of the beam of illumination radiation being scanned over a circle and to adjust not only the cavity mirror but also the mirror o f the system for forming the main laser beam. (C) 1998 The Optical Soc iety of America. [S1070-9762(98)02211-8].