Temperature-tunable nanosecond optical parametric oscillator based on periodically poled |
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Authors: | HP Li DY Tang SP Ng J Kong |
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Institution: | Photonics Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore |
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Abstract: | We report a compact quasi-phase-matched optical parametric oscillator (OPO) using periodically poled MgO-doped LiNbO3 with different grating periods. The OPO is pumped by a diode-pumped passively Q-switched Nd:YAG laser providing 4.8-ns pulses at 5.4-kHz repetition rate. The OPO generates signal and idler wavelengths tunable in the ranges of 1.5– and 2.8–, respectively, by changing the crystal temperature between room temperature and . The temperature-dependent Sellmeier equation for the extraordinary refractive index of MgO-doped LiNbO3 is modified in the Mid-IR region, which gives an accurate prediction of the experimental temperature-tuning results. The linewidth of the signal wave is in the range of 0.5–1.0 nm without any controlling element. |
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Keywords: | Optical parametric oscillators Quasi-phase matching Diode-pumped laser |
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