Numerical model for simulation of generation process in advanced pulse-periodic high-peak-power picosecond diode-pumped Nd:YAG and Nd:YLF lasers has been developed. The model adequately describes picosecond pulse formation governed by active and passive mode-locking, negative feedback and adjustable loss level in the oscillator cavity. Optical jitter of output pulses attributed to laser generation development from spontaneous noise level was evaluated using statistical analysis of calculation results. In the presented laser scheme, minimal jitter value on the level ~40 ps was estimated.
Experimental and theoretical modeling results for pulsed diode-array end-pumped Nd:YAG laser with
aberrational thermolens are presented. Millijoule level energy stable picosecond pulse generation is realized in a wide
range of repetition rates. Limiting factors of stable laser operation and quantitative contribution of aberrations in beam
quality degradation are discussed.
Time-domain technique was used for experimental investigation of narrow molecular resonances of H2 and CO2 with total width about 10-2-10-3 cm-1 and with spectral shape profile governed by several physical mechanisms. Experimental pulse response were measured in delay time range up to 16 ns. Qualitative and of numerical analysis of the results will be discussed.
Population and third order nonlinear polarization coherent changes on Raman electronic transition of thallium atoms excited by a couple of 30 ps pulses of dye- and Nd:YAG lasers were observed. Collimated exciting and probing beams propagated through a heated cell of one centimeter length with thallium vapor. Population and nonlinear polarization dependences as functions of exciting pulses energy product were monitored using permanently delayed probing pulses.
A sequence of quasi-equally spaced spectral lines, ranging from the IR to the UV was obtained, when 1.06-micrometers linearly polarized pulses of duration 30 ps and energy of up to 40 mJ were focused into a cell filled with hydrogen at pressures of up to 120 atm and formed there is a self-focusing channel. The average frequency interval between spectral lines was approximately equal to the frequency of rotational transition in hydrogen 587 cm-1. These lines exhibited a substructure made up by components produced in hydrogen by stimulated rotational and vibrational Raman scattering and cascaded four-wave parametric processes. In the visible, the energy of each spectral line was around 10(mu) J.
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