Tm:YLF laser-pumped periodically poled MgO-doped congruent LiNbO_3 crystal optical parametric oscillators

Abstract

At room temperature, highly efficient, doubly resonant periodically poled MgO-doped congruent LiNbO3 crystal optical parametric oscillators (OPO) pumped at 1.9 μm have been realized for the first time to our knowledge. A 2.9 W, 2 kHz acousto-optic Q-switched homemade Tm:YLF laser served as a pump source. A 900 mW mid-infrared emission generated from an OPO is illustrated. The overall mid-infrared generation conversion efficiency reached 31%, whereas the slope efficiency was up to 70%.

Sellmeier and thermo-optic dispersion formulas for the extraordinary ray of 5 mol % MgO-doped congruent LiNbO3 in the visible, infrared, and terahertz regions

“…% MgO-doped congruent LiNbO 3 (MgO:LiNbO 3 ) crystals precisely. For instance, in the case of a quasiphase-matched optical parametric oscillator (OPO) pumped by the Tm:YLF laser at 1.9075 μm, the temperature-tuning curves calculated with the temperature-dependent Sellmeier equations [5][6][7] are significantly different from the experimental points reported by Xu et al [8]. Since QPM in periodically poled MgO:LiNbO 3 (MgO:PPLN) is usually achieved by temperature tuning to realize perfect phase matching, accurate Sellmeier and thermo-optic dispersion formulas are needed for predicting precisely the grating periods and phase-matching temperature.…”

Thermal lensing and microchip laser performance of N g-cut Tm3+:KY(WO4)2 crystal

“…The useful feature of Tm 3+ ion is a wide (∼250 nm) tunability range for laser emission; this range includes the absorption bands of water. The recognized applications of Tm-based lasers are laser surgery and remote atmospheric sensing; they can be used also for pumping of mid-infrared optical parametric oscillators [4]. Recently, an attention was paid to the development of 2 µm-microchip lasers, because of their simplicity, compactness and possibility to achieve the single longitudinal mode operation.…”

“…Recently, an attention was paid to the development of 2 µm-microchip lasers, because of their simplicity, compactness and possibility to achieve the single longitudinal mode operation. Tm-or Tm,Ho-microchip lasers based on YVO 4 [5], GdVO 4 [6], YLiF 4 [7,8] or YAlO 3 [9,10] laser host materials have been realized.…”

Developments of mid-infrared optical parametric oscillators for spectroscopic sensing: a review

“…20,76 However, these problems can be overcome by using frequency-stable, singlemode lasers. 77,78 The doubly resonant configuration where pump and signal (or idler) are resonated is called pumpenhanced SRO and provides a compromise between the low threshold of DROs and the wide tunability of SROs. 20,79 Triply resonant OPOs suffer from the combined problems of both types of DROs with smaller tunability in comparison to SRO, but they offer lowest threshold (can be seen from the coupling equations) in the range of several milliwatts or less.…”