High power Nd:YAG laser with self-pumped phase-conjugate loop cavity and repetitive pulsed diode-matrix side-pumping

Abstract

The joule-range high-beam-quality Nd 3+ :YAG laser oscillation in the multiloop self-pumped phase-conjugate cavity without an output coupling mirror at four-wave mixing of intracavity beams directly in the 110-mm long Nd 3+ :YAG rod with 12.6 kW diode side-pumping is developed and studied. The oscillation efficiency of up to 18 % and average power of up to 22 W were achieved in the optimized geometry of the laser cavity at the 13.9 kW pumping with repetition rate of up to 20 Hz and pulse duration of up to 475 μs. The laser generated a single high-intensive 200-ns giant laser pulse (or series of such pulses with microsecond period at increased pumping) oscillated at self-Q-switch on gain gratings with relatively narrow linewidth of about 2 GHz followed by low-intensive free-running wideband lasing. We also realized a passive Q-switch by the F 2 -:LiF and Cr 4+ :YAG crystals with oscillation of pulse trains and also 30-ns single-pulse oscillation with an individual pulse energy of up to 60 mJ and peak power of up to 4 MW at narrowed laser spectra down to 1.7 GHz.

Passively Q-switched high-energy all-solid-state holographic Nd:YAG laser with a multiloop cavity

“…In the optimized geometry of the laser cavity ( Fig. 1(b)), the laser oscillation character changed from single pulsed self-Q-switching 13 to repetitively pulsed self-Q-switching by periodically writing and erasing holographic gain gratings in the active Nd:YAG element 12 . …”

“…In 13 we have experimentally investigated passive Q-switching of the diode-pumped Nd:YAG laser cavity for the laser scheme of Fig. 1(a).…”

Внутрирезонаторные Голографические Решетки И Лазеры С Управляемым Спектором На Их Основе

“…Наиболее широко данная идея получила развитие в области диодных и волоконных узкополосных лазеров, характеризующихся сравнительно низкой мощностью излучения [3,4]. Задачи дистанционного исследования и анализа состава газовых смесей, а также реализации нелинейных эффектов, чувствительных к спектральной яркости, диктуют необходимость разработки узкополосных лазеров с управляемым спектром средней и высокой мощности [5,6].…”

Side-pumped neodymium laser with self-adaptive, nonreciprocal cavity

“…Additionally, it significantly degrades the spatial quality and decreases the overall performance of the laser system. There are several techniques, i.e., injection−seeding [1,2], grazing−incidence−angle [3,4] or self−adaptive resona− tors based on phase conjugation via gain saturation mecha− nism [5][6][7][8][9][10][11][12][13][14][15], that allow to generate near−diffraction−limited beam output in the presence of a high inhomogeneity of the gain spatial profile. In this paper we demonstrate the results of a self−adaptive Nd:YAG laser with intra−cavity amplifier with an open−loop, nonreciprocal cavity containing phase conjugate mirror.…”