Compact eye-safe laser sources based on OPOs with KTP or PPKTP crystals |
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Authors: | Liviu Neagu Constantin Ungureanu Razvan Dabu Aurel Stratan Constantin Fenic Laurentiu Rusen |
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Institution: | aNational Institute for Lasers, Plasma and Radiation Physics, Bucharest, Romania |
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Abstract: | We report on compact eye-safe nanosecond laser sources emitting in the 1.5 μm wavelength range based on non-critically phase-matched parametric interaction in optical parametric oscillators (OPOs) with KTP and periodically poled KTP (PPKTP) crystals, pumped by the fundamental frequency of Nd:YAG lasers. As much as 250 μJ signal pulse energy at 1.5 μm wavelength, 6.5 ns FWHM pulse-width, has been obtained in a PPKTP-OPO, extracavity pumped by a Nd:YAG microlaser oscillator–amplifier at 650 μJ pump pulse energy, 8 ns pulse-width. A single signal pulse of 2.7-mJ output energy at 1.57 μm wavelength, less than 5 ns pulse-width, was generated in a KTP-OPO, intracavity pumped by a passively Q-switched Nd:YAG laser. |
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Keywords: | Eye safe laser radiation Nanosecond optical parametric oscillator Non-critical phase-matching |
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