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In this paper, we have developed a high-performance injection-seeded optical parametric oscillator (OPO) based on periodically poled KTiOPO<sub>4</sub> (PPKTP). Because this NLO approach does not entail population inversion and avoids associated refractive index variations, it generates narrowband tunable light pulses at ~840 nm with <5 muJ energy. These have well-characterized shot-to-shot...
An injection-seeded pulsed optical parametric oscillator is amplified and the frequency chirp characterized using optical heterodyne techniques. The low-chirp 842-nm signal output depends only slightly on amplifier pump energy, suitable for high-resolution spectroscopy.
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