Selecting laser transitions in monomode microcrystal resonator - controlling resonator temp. so that modes are shifted without frequency-pulling through choice of Q

摘要

A pumping laser diode (11) mounted on a heat sink (15) is coupled optically (12) to a monolithic lasing crystal (13) temp.-controlled by, e.g. a Peltier element (14). The emission lines of the laser radiation are selected by temp.-dependent mode displacement. The Q of the microcrystal resonator is chosen to be greater by at least two orders of magnitude than the ratio of the wavelength to the effective line width of single or multiple laser transitions. A lower limit of temp. is achieved by suppression of a complete range between two mode jumps. ADVANTAGE - Unambiguous and durable selection of laser lines in either one, two or three-line operation is achievable with relative ease and economy.