Abstract:A quasi-continuously pumped picosecond oscillator-amplifier laser system based on two identical 2.4% Nd:YAG slabs in a single bounce geometry was developed and investigated. The oscillator was passively mode locked by the multiple quantum well saturable absorber inserted into the resonator in transmission mode. Output train containing 7 pulses with total energy of 900 μJ was generated directly from the oscillator. Single pulse with energy of 75 μJ, duration of 113 ps and Gaussian spatial profile was cavity dumped from the resonator and amplified by the single pass amplifier to the energy of 830 μJ. Comparison with our previously reported data obtained with similar system based on Nd:GdVO4 shows advantage of using highly doped Nd:YAG for generation of sub-millijoule pulses in one hundred picoseconds range, which might be interesting in many applications. Schematic of the laser oscillator and amplifier

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A quasi-continuously pumped picosecond oscillatoramplifier Nd:GdVO4 laser system based on two identical slabs in a single bounce geometry is reported. Pulse duration is from 160 to 55 ps resulting from the pulse shortening along the extended mode locked train from passively mode locked oscillator, which was measured directly from a single laser shot. The shortest 55 ps long cavity dumped single pulses from the oscillator with the energy of 15±1 μJ and the contrast better than 10 −3 were amplified to the energy of 150 μJ with the contrast better than 10 −3 after the single-pass amplification and to the energy of 400 μJ after the double-pass amplification.Intensity, a.u. The autocorrelation curve of the pulse from the oscillator (τp = 55±1 ps) and the amplified pulse (τp = 55±2 ps) -measured data and Gaussian fit

Electro-optically Q-switched flash-lamp pumped Pr:YAP laser was demonstrated. Employing LiNbO3 Pockels cell in quarter-wave configuration giant pulses with an energy and length of 5 mJ and 50 ns, respectively, were obtained at 747 nm wavelength. Laser oscillator was operating at room temperature and with 0.5 Hz repetition rate. Considering that the Pr:YAP output radiation is naturally polarized, the necessity of polarizer presence inside resonator was also investigated. Energy level diagram of Pr3+ ions in YAP matrix, temporal structure of Q-switched pulse (Ch1), and Pockels cell switch pulse (Ch2)

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