High-power mid-infrared pulse MgO:PPLN optical parametric oscillator pumped by linearly polarized Yb-doped all-fiber laser

Ji, Yanhui; Wan, Haohua; Yu, Dejin; Zhang, Kuo; Pan, Qikun; Sun, Jian; Chen, Yi; Chen, Fei

doi:10.1016/j.optlastec.2021.107545

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…The schematic diagram of OPO was almost similar to the setups described previously [17][18][19][20]. The pump beam was a linear-polarized YDFL delivering a maximum power of 207 ± 10 W. To enhance optical-optical conversion efficiency, the pump polarization was rotated to match the e → e + e interaction in the nonlinear crystal.…”

Section: Methodsmentioning

confidence: 99%

“…Using the configuration and optimizing the output coupler curvature radius, pump beam waist radius, and cavity length, a miniaturized idler-resonant OPO could afford a maximum power of 5.84 W at 3.76 µm (conversion efficiency > 14.0%) with M 2 factors of 1.57 and 1.49 along the horizontal and vertical directions, respectively [19]. Furthermore, after optimizing the parameters including the pump repetition rate, pulse width, and waist diameter, a signal-resonant and pump-double-pass OPO generated 10.82 W at 3.754 µm with a conversion efficiency of 13.68% [20]. By employing semi-external-cavity-structured OPO with pump-doublepass, 9.23 W of output power was obtained at 3.82 µm with a neodymium-doped yttrium orthovanadate (Nd:YVO 4 ) laser power of 48.2 W [21].…”

Section: Introductionmentioning

confidence: 99%

“…It is noteworthy that the setups in Refs. [17][18][19][20][21] contain isolators for avoiding pump source damage resulting from unwanted backward pump beam. Isolators with high damage threshold enlarge OPO's module and increase costs.…”

Section: Introductionmentioning

confidence: 99%

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Performance Studies of High-Power Optical Parametric Oscillators Pumped by a Pulsed Fiber Laser

Shao

et al. 2023

Applied Sciences

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High-power optical parametric oscillators (OPOs), as mature radiation sources in mid-infrared (MIR), degenerate gradually with wavelength increase, mainly above 3700 nm. Using a periodically poled magnesium-oxide-doped lithium niobate (MgO:PPLN) as the nonlinear crystal, we build a high-power signal-resonant OPO pumped by ytterbium-doped fiber laser (YDFL). To improve the OPO’s output power at ~3.8 μm, the parameters, such as the pump beam’s waist diameter and location, the curvature radius of the output coupler and the length of MgO:PPLN, are discussed in detail. When pump power is 79 ± 4 W with a repetition rate of 200 kHz, the OPO provides up to 8 ± 0.4 W average power in beam quality with M2 factors of ~1.84 and ~1.69 in the two axes. Under the highest output power, the center wavelength of the idler beam is 3768.4 nm with a full-width at half-maximum (FWHM) bandwidth of ~18.6 nm. When the output power reaches ~6.3 W, its power stability is 1.6% root mean square (RMS) over 7 h. Further analysis of the factors affecting OPO’s performance and simple structure are critically essential for compact OPO prototypes with a capacity of high output power.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Studies of High-Power Optical Parametric Oscillators Pumped by a Pulsed Fiber Laser

Shao

et al. 2023

Applied Sciences

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“…The popular nonlinear crystals for OPOs in this band include PPLN, PPLT, KTP, ZGP, CSP, and so on. PPLN is one of the most popular materials because it possesses a large effective nonlinear coefficient and avoids the walk-off effect for long interaction paths [5]. * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

High-efficiency broad-linewidth widely-tunable mid-infrared OPO based on fan-out PPLT

Liu¹,

Ye²,

Zhang³

et al. 2023

Laser Phys.

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We reported a high-efficiency, broad-linewidth, wide-tuning-range singly-resonated optical parametric oscillator (OPO) based on a fan-out PPLT crystal. When the PPLT crystal was operated at 120 °C and pumped by Q-switched 1064 nm laser at 14.17 W with a circular pump profile, the overall output power of OPO was 7.22 W (η = 50.4%) for both the signal and idler waves. The central wavelength and linewidth of the mid-infrared (MIR) laser were 3770 nm and ∼40 nm. A wavelength tuning range of 3538–3941 nm was accomplished by adjusting the crystal period through simple mechanical movement. Due to the larger coverage of gratings with an elliptical pump profile, the output linewidth of the MIR laser was further broadened to ∼100 nm, which is ten times more than other non-fan-out PPLT OPOs. Both pumping methods with different profiles were operated at 30 kHz, 49.2 ns for the 1064 nm laser, the power fluctuation of the obtained MIR laser was within 3.5%.

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“…Chen Fei et al presented a MgO: PPLN-based OPO pumped by an allfiber Yb-doped fiber laser. A maximum power of 79.1 W at 1,064.1 nm was obtained with a repetition rate of 300 kHz and pulse duration of 200 ns (22). However, most of these studies focus on the OPO approach and pumping with solid-state laser.…”

Section: Introductionmentioning

confidence: 99%

2.76–3.98 μm picosecond mid-infrared optical parametric generation in a muti-grating MgO: PPLN

Yin

Wang

et al. 2022

Front. Phys.

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The high repetition rate, widely tunable, picosecond mid-infrared laser plays an important role in various fields. In this paper, the single-pass optical parametric generator (OPG) pumped by Yb-fiber laser based on MgO: PPLN is proposed. The Yb-fiber laser is mode locked by a nonlinear amplifying loop mirror (NALM) with an all-polarization-maintaining (PM) structure. A maximum power of 6.2 W was obtained with a repetition rate of 15.8 MHz and pulse duration of 18 ps after amplification by cascaded fiber. Based on the principle of nonlinear frequency down-conversion, the tunable mid-infrared output wavelength of 2.76–3.98 μm was realized by varying the crystal grating periods and temperature. The maximum power was 500 mW at 3.22 μm, corresponding to a quantum conversion efficiency of 25%, and the relative power fluctuation was measured as 0.37% over 30 min.

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High-power mid-infrared pulse MgO:PPLN optical parametric oscillator pumped by linearly polarized Yb-doped all-fiber laser

Cited by 8 publications

References 15 publications

Performance Studies of High-Power Optical Parametric Oscillators Pumped by a Pulsed Fiber Laser

Performance Studies of High-Power Optical Parametric Oscillators Pumped by a Pulsed Fiber Laser

High-efficiency broad-linewidth widely-tunable mid-infrared OPO based on fan-out PPLT

2.76–3.98 μm picosecond mid-infrared optical parametric generation in a muti-grating MgO: PPLN

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