QUASI THREE-LEVEL SOLID LASER AND METHOD OF OPERATION Russian patent published in 2009 - IPC H01S3/16 

FIELD: electricity; medicine.

SUBSTANCE: invention relates to solid laser, namely to lasers with laser diode pumping. The invention can be applied in medicine and cosmetology in industrial scope. Quasi three-level solid laser includes laser diode, active element, laser diode radiation focusing device and laser resonator. The laser contains laser diode temperature sensor, current and laser diode temperature control unit having electrical connection with laser diode, thermal stabilisation unit and diode temperature sensor. The laser diode control unit is designed so that it can control various currents and laser diode temperatures. Method of quasi three-level solid laser operation provides for transmitting current via laser diode. The laser diode radiation is focused inside the above-mentioned active element placed between input and output mirrors. After that the radiation is reflected from the output surface of active element. Radiation from the active element is transmitted though input and output surfaces of the active element. In addition, the radiation falling on the output mirror of resonator is partially transmitted through it whereas radiation from laser diode reflected from the laser elements is simultaneously reduced during transients related to laser diode switching on or changing diode radiation power. The current flowing through laser diode is changed so that the length of laser diode radiation wave coincides with the centre of active element absorption line.

EFFECT: improved reliability of laser, extended lifetime and increased mean power of radiation.

34 cl, 4 dwg