V. V. Nazarov

Dynamics of the lasing spectrum of a 3-μm Er:YLF laser with semiconductor pumping

This paper discusses a theoretical and experimental study of lasing in an Er:YLF crystal at four wavelengths of the 3-μm transition with selective pumping by the 0.98-μm radiation of laser diodes. Analytical expressions are obtained that describe the variation of the lasing spectrum of the laser.

A compact Er:YLF laser with a passive Fe 2+ :ZnSe shutter

This paper describes an experimental study of the lasing of an Er:YLF laser at wavelengths 2.66, 2.71, and 2.81 µm under selective pumping by the radiation of laser diodes at wavelength 0.98 µm and passive Q-switching of the cavity by a shutter based on an Fe2+:ZnSe crystal. Single pulses are obtained with energy 3 mJ and width 30 ns at wavelength 2.81 µm.

The dynamics of the emission spectrum of an Er: YLF laser in the pulsed-periodic operating regime

The lasing of an Er:YLF laser has been theoretically and experimentally investigated at wavelengths 2.66, 2.71, and 2.81μm in the pulsed-periodic regime under selective pumping by laser-diode radiation at 0.98μm. A substantial variation of the delays of the beginning of lasing at the individual wavelengths is observed, depending on the pump-pulse-repetition rate, along with loss of the lasing at wavelengths 2.66 and 2.71μm as the pulse-repetition rate increases.

Diode pumped Er:YLF laser with tunable lasing spectrum

This paper presents the results of theoretical and experimental investigations of Er:YLF lasing at wavelengths 2.66, 2.71, and 2.81 um for pulse-periodical diode pumping at wavelength 0.98 um. Considerable change of lasing spectrum with increasing of pulse repetition rate was observed. The new method of tuning lasing spectrum based on this effect was suggested.

Multiwave diode pumped Q-switch ErYLF-laser

The results of theoretical and experimental investigations of spectral and power parameters of diode pumped multiwave Q-switch Er:YLF-laser are presented. The series of giant pulses on 2.66, 2.71, 2.81um wavelengths at peak power up to 100kW and pulse duration 30ns were obtained. The theoretical optimization of laser resonator to improve of laser radiation brightness and beam quality was carried out.

Study of neodymium-containing crystalline active elements with discrete and gradient variation of the dopant concentration in the pumping direction

This paper discusses the operation of active elements with various types of supplementary end heat sinks in a laser based on neodymium-containing crystals with end diode pumping. A comparison is made of heat sinks coupled with the active element and fabricated from an undoped crystal with the same matrix as the active element, as well as crystals with gradient variation of the dopant concentration from zero to a maximum. The types of laser devices in which such elements are suitable are determined.

Powerful compact Nd:YAG laser

A compact pulsed Nd:YAG laser with lamp pumping has been developed that generates trains of pulses at wavelengths of 1.064 and 0.532μm. The optical layout of the cavity and the parameters of the gradient output mirror have been optimized to achieve quasi-uniform transverse distribution of the output radiation. The pump regimes are optimized, making it possible to achieve a total energy of the laser radiation of about 1J in a train of four pulses at a repetition rate of 5Hz in the course of a single pump pulse. The small size of the laser (the volume of the laser radiator is about 150cm3) allows it to be successfully used in laser medicine.

Modeling a solid-state laser with diode pumping and a parametric converter of the radiation frequency

A numerical model of a solid-state single-pulse laser with optical parametric generation has been developed that makes it possible to investigate the spatial and energy characteristics of the parametrically generated radiation, taking into account the diffraction effects of the pump radiation and of the signal and idle waves in the cavity of the optical parametric generator (OPG), as well as the interaction with the pump radiation in the volume of the nonlinear crystal of the OPG. Numerical studies of the spatial and energy characteristics of the radiation of an extracavity OPG excited by the radiation of a single-pulse Nd:YVO4 laser with diode pumping have been carried out. The results of a numerical optimization of the cavity configuration of the OPG that makes it possible to improve the radiance characteristics of the parametrically generated radiation at a wavelength of 1.57μm are presented. The energy characteristics of the parametrically generated radiation are compared for linear and ring structural layouts of the OPG cavities.