L. V. Khloponin

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.

High-efficiency diode-pumped Er:YLF laser with multi-wavelength generation

Er:YLF diode pumped solid-state laser with high optical efficiency and brightness was designed, built and tested. Pulsed multi-frequency generation at a number of wavelengths in 2.66-2.85 μm range was theoretically analyzed and experimentally investigated. An effective computational model used for Er:YLF laser optimization that accounts for the generating spectrum was developed.

Long pulse compact and high-brightness near 1-kW QCW diode laser stack

A custom designed compact, high brightness diode laser array stack was designed and manufactured using proprietary methods that are robust and suitable for low cost manufacturing. The diode laser stack consisted of four 10 mm-wide diode laser bars having lasing wavelength of 970 - 980 nm mounted onto high performance submounts separated by approximately 1mm. Each diode laser bar had a 50% fill factor. The cooling methodology employed used a combined passive and active scheme and not the traditional more expensive and more complicated standard microchannel coolers used for high duty cycle applications. The total combined optical power attained from the diode array stack was close to 1 kW for current levels up to 220 A, limited only by the capability of the power supply. In this paper, we summarize the performance results for this diode laser array and analyze the maximum expected optical performance as a function of operating current and pulse width and junction temperature limit.

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.

Resonators with field rotation

Basic features of laser resonators with field rotation are discussed. Main types of schemes of resonators providing high performance and low sensitivity to misalignment are represented. Results of investigation, development and application of resonators with field rotation to various laser systems are reported.

Compact laser schematics for generation of stable subnanosecond pulses with energy up to 1J

Different schematics of compact Nd:YAG laser system capable to generate sub-nanosecond output pulses with energy up to 1J are described. Trade-offs and advantages of different laser schematics are discussed.

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.

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.