Abstract
An efficient, eye-safe, high-repetition-rate, intracavity optical parametric oscillator (IOPO) inside an acousto-optically Q-switched Nd:YVO4 laser end pumped by a 30-W fiber-coupled diode laser was demonstrated. The pumping, acousto-optically Q-switched Nd:YVO4 laser gives 3-W average output power at 1064-nm wavelength at 40-kHz repetition rate. An additional separating mirror, ‘x-cut’ KTP crystal and output coupler highly reflective at 1064-nm and partially transparent at 1572-nm wavelengths form a flat–flat IOPO resonator of 35-mm length. We have achieved 3-ns-duration pulses for 20-mm-long KTP and 4-ns-duration pulses for 30-mm-long KTP, respectively. More than 8-kW-peak-power pulses with an average power of 1.5 W at the signal wavelength for 40-kHz repetition rate were demonstrated. Due to the intracavity spatial cleaning effect, a near diffraction limited signal beam was achieved despite a relatively worse beam quality of the pumping beam. Conversion efficiencies of 50% with respect to Q-switched output at 1064-nm wavelength and 11% with respect to diode pump power were achieved.
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42.55.Xi; 42.60.Gd; 42.65.Yj
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Żendzian, W., Jabczyński, J., Wachulak, P. et al. High-repetition-rate, intracavity-pumped KTP OPO at 1572 nm. Appl. Phys. B 80, 329–332 (2005). https://doi.org/10.1007/s00340-004-1717-x
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DOI: https://doi.org/10.1007/s00340-004-1717-x