Multiwavelength Mid-Infrared Laser Generation Based on Optical Parametric Oscillation and Intracavity Difference Frequency Generation

et al. 2018

Laser Phys.

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We demonstrated a new kind of dual-wavelength mid-infrared optical parametric oscillator (OPO), synchronously pumped by two independent fiber lasers, which were combined in parallel by a wavelength division multiplexer and had central wavelengths located at 1018 nm and 1064 nm separately. With reasonable cavity design and under the maximum pump power of 55.5 W, two idler emissions fixed at 3200 nm and 3704 nm were obtained and the total idler output power reached 2.6 W, indicating a 4.7% pump-to-idler conversion efficiency. Just one signal beam was observed in the experiment, which was around 1493 nm. It was analyzed that two OPO processes existed in the resonant cavity and shared the same signal beam, both which simultaneously met the phase-matching conditions.

Section: Experiments Setup and Resultsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Fiber-laser-pumped, continuous-wave, dual-wavelength, mid-infrared optical parametric oscillator

et al. 2018

Laser Phys.

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“…Adopting dual-or multi-wavelength fiber lasers as pump sources was another effective method to realize DW mid-infrared output [16], [17]. Recently Yaping Shang and Peng Wang reported DW and triple-wavelength mid-infrared OPOs, pumped by DW fiber sources which was obtained by combining two fiber lasers in cascade [16], [17]. Besides, Peng Wang et al demonstrated a wide tunable, DW, continuous-wave (CW) OPO by keeping one pump wavelength fixed and enabling the other tunable [18].…”

Section: Introductionmentioning

confidence: 99%

Low Threshold, Dual-Wavelength, Mid-Infrared Optical Parametric Oscillator

et al. 2019

IEEE Photonics J.

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In this letter, we demonstrated a dual-wavelength (DW) mid-infrared optical parametric oscillator (OPO) that was pumped by two independent fiber lasers fixed at 1018 nm and 1080 nm, and realized phase-matched signal beam coupling by tuning grating period of PPLN. Based on signal beam coupling, two interesting phenomena were observed for the first time. One is that the OPO threshold for 1018 nm and 1080 nm pump beams could be drastically lowered from 15.4 W to 266 mW and from 13.5 W to 1.38 W separately. The other is that the total idler power obtained when the OPO was simultaneously pumped by two fiber lasers was higher than sum of idler power obtained when the OPO was independently pumped by two fiber lasers, revealing obvious parametric gain enhancement. It also indicated that the two independent OPO processes became coherent when two signal beams were coupled. The results exhibit great potential in practical applications such as frequency down-conversion of some special near-infrared laser sources such as pulsed single-frequency sources, spectrum high-speed swept sources, and ultra-short pulse sources with low duty cycle.

“…Compared with other kinds of pump sources, fiber lasers have the potential to achieve multiwavelength output without complicate structure. In the previous work, we have obtained dual-and triple-wavelength mid-infrared output based on simultaneous intracavity OPO and DFG in single resonant cavity pumped by multi-wavelength fiber lasers [14], [15].…”

Section: Introductionmentioning

confidence: 99%

Dual-Wavelength Mid-Infrared Generation Using Intracavity Stimulated Raman Scattering of PPLN

et al. 2018

IEEE Photonics J.

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We report, to the best of our knowledge, the first demonstration of a continuouswave, dual-wavelength (DW) mid-infrared optical parametric oscillator (OPO) based on the stimulated Raman scattering (SRS) effect of periodically poled lithium niobate (PPLN). The OPO was pumped by two independent fiber lasers, one being fixed at 1018 nm and the other being tunable. The high-power 1018-nm source built parametric oscillation, induced SRS effect in PPLN and generated 1495-nm signal beam as well as 1506-nm Raman beam. The tunable fiber laser was set at 1080 nm and the phase-matched difference frequency generation (DFG) occurred between the 1506-nm Raman beam and 1080-nm pump beam. Finally, DW idler beam located at 3189 and 3819 nm was obtained whose power ranged from 8.044 to 8.115 W, in which the 3189-nm idler power made up the majority of about 8 W and the maximum 3819-nm idler power reached 0.154 W. The slope and conversion efficiency of DFG and OPO processes was also discussed separately.