Biological Effect of Continuous, Quasi-Continuous and Pulsed Laser Radiation

In this work, for the first time, comparative studies of biological activity of low intensity continuous, quasi-continuous and pulsed laser radiation of nano- and picosecond time ranges with the same average power density are carried out. It is shown, that, despite the significant differences in peak values of intensity of acting factor, both continuous and quasi-continuous radiation and radiation of nano- and picosecond ranges are able to have both stimulating and inhibiting effects on all investigated parameters of functional activity of biological systems in a certain range of dose rates. The ability of laser radiation of near infra-red spectral region (800 - 1340 nm) located out the absorption bands of main chromophores of cells to have regulatory effect on biochemical processes that control the hatching of branchiopod crustaceans Artemia salina L. upon irradiation of their cysts is revealed. The role of molecular oxygen and water as acceptors of laser radiation is discussed. Keywords: Low intensity laser radiation, Laser activation, Biological activity, Zooplankton Artemia salina L., Sturgeon sperm

Tunable operation of an all solid-state diode pumped Raman laser with self-frequency conversion

The tunable operation of an all solid-state diode pumped Raman laser on a Yb:KYW crystal is demonstrated. The possibility of a simultaneous tunable operation for laser generation in the 1029–1032 nm range and Stokes generation in the 1136–1139 nm range is shown. A slope efficiency of 12% and a maximum average power of 14.5 mW were achieved for the Stokes output

2.1 microm continuous-wave Raman laser in GeO2 fiber.

Accepted versio