Stability analysis of a diode-pumped

For the development of a diode-pumped high-power solid-state laser, a series of laser heads have been used in general with and without thermal birefrin¬gence compensation. For example, Akiyama et al.1 used three laser heads to obtain a output power of 5.4 kW cw without the birefringence compensation. A resonator with two laser heads and a 90° quartz ro¬tator in between was used for the thermal birefrin¬gence compensation of the crystal rod.2 In the side-pumped Nd:YAG laser, at the high-input pump power, the crystal rod has a short thermal focal length for the crystal rod with a small diameter. Therefore the detailed analysis of the resonator sta¬bility condition depending on both mirror distances and a crystal separation is essential for the achieve¬ment of a high-output power with good stability, iso¬tropic beam profile, and high optical efficiency.
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