Showing papers by "Vladimir B. Tsvetkov published in 1996"
08 Nov 1996
TL;DR: In this article, the results of application of the Cr4+ doped crystals as Q-switches and nonlinear media for four-wave mixing in Nd-laser are presented.
Abstract: Results of application of the Cr4+ doped crystals as Q- switches and nonlinear media for four-wave mixing in Nd- lasers are presented. Cr4+ centers demonstrate unique properties which give rise to use of the Cr4+ doped crystals both as active media and passive elements of laser resonators. Lasers based on these active media demonstrate tunable lasing in the near infrared range 1.1-1.6 microns. This spectral region is very interesting for environmental monitoring applications. Passive elements made of the Cr4+ doped crystals are mainly used as Q-switches for Nd- lasers operating in 1 micron region. Another possibility is to use these elements for preventing lasing in 1 micron range to make more easy the operation of Nd-lasers on the weak transitions. Both these wavelength are very interesting for medical applications. In this case Cr4+ centers can be formed directly in the active rod. So the rods with combination of active and passive properties could be produced. The newest form of applications of crystals with Cr4+ centers is the use of it as nonlinear media for four-wave mixing in Nd-lasers. New optical schemes of resonators, designed to use these modern decision, enable us to create Nd-lasers with a very low beam divergence which can be used for lidars to monitor the pollutions.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
1 citations
31 Jan 1996
TL;DR: In this paper, the influence of the polarization dependent saturable absorption in a Cr4+:YAG crystal on the output parameters of a diode laser pumped passively Q-switched Nd:GdVO4-laser is described.
Abstract: This paper describes the influence of the polarization dependent saturable absorption in a Cr4+:YAG crystal on the output parameters of a diode laser pumped passively Q-switched Nd:GdVO4-laser. Rotation of the Cr4+:YAG crystal changes the pulse length ftom 30ns to 170ns, while the pulse repetition rate varies from 40kHz to 300kHz.
1 citations
24 Apr 1996
TL;DR: A prototype pulsed laser of dual heads of Nd:YAG and Er :YAG has been developed in this article for treating both soft and hard tissues in dentistry.
Abstract: A prototype pulsed laser of dual heads of Nd:YAG and Er:YAG has been developed. Nd:YAG laser emits 1.06 micrometers and 1.3 micrometers. Er:YAG laser generates 2.94 micrometers. This laser system is designed for treating both soft and hard tissues in dentistry. Nd:YAG laser has about 100 microseconds pulse duration and repetition rates are up to 100 Hz at 1.06 micrometer and up to 30 Hz at 1.3 micrometer. The average power at 50 Hz is up to 30 W at 1.06 micrometer. Up to 10 W at 30 Hz can be obtained at 1.3 micrometer. Er:YAG laser has about 100 microsecond pulse duration, repetition rates up to 5 Hz and the average power up to 5 W. Current 1.06 micrometer Nd:YAG dental lasers show some difficulties in treating soft tissue due to low absorption and higher penetration. Dye as absorbing medium is often applied on targets to enhance absorption. A 1.3 micrometer wavelength is expected to be valuable for soft tissue treatment since absorption at this wavelength is more than ten times higher than at 1.06 micrometer. A 2.94 micrometer wavelength is available for hard tissue surgery.