Igor G. Kuchma

Storage and extraction efficiency in the erbium phosphate glass active medium

Energy parameters for the erbium glass laser medium are calculated in the chosen model for the laser pump. The calculation results are compared with the experimental data. Stored energy extraction is experimentally measured.

Saturated laser Fourier-amplifier as a source for half-tone images in laser projection

A contradiction between high efficiency of an amplifier operating in a saturated mode, and nonlinear distortions in image reproduction characteristic for this regime is solved. A lasing medium is located in a Fourier-plane of the image, its gain profile being specially shaped, while the amplified image is illuminated by a laser beam which angular divergence is appropriately formed. Criteria for the gain shape and beam divergence are formulated. A possibility for correct amplification of binary and/or half-tone images with high efficiency of energy stored in the laser medium (up to 70%) is shown. The results are applicable for laser image projectors of systems of virtual reality, simulators, etc., providing images with high dynamic range (e.g., pictures of illuminated landing stripes, approaching car lights, etc.).

New quickly relaxing dye for passive mode-locking at 1300-1750 nm

New reversible bleaching polymethine dye 5105-U for spectral range of 1300 - 1750 nm is proposed and investigated. Its properties are compared with those of the 4919-U dye. It is shown that the new dye is promising for passive mode locking and Q-switching at wavelengths of 1300 - 1750 nm.