High-energy, mid-IR, picosecond fiber-feedback optical parametric oscillator

Wu, Yudi; Liang, Sijing; Fu, Qiang; Bradley, Thomas D.; Poletti, Francesco; Richardson, David J.; Xu, Lin

doi:10.1364/ol.461118

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…The MIR laser used in our pulse delivery experiments was an in-house-built 120-ps optical parametric oscillator (OPO) providing continuous idler wavelength tuning in the range of 2.6-3.6 µm and a maximum average power of 1 W at a repetition rate of 1 MHz, similar to our previous report [26]. The corresponding maximum peak power and pulse energy were 8.3 kW and 1 µJ, respectively.…”

Section: (B) Co 2 Gas Absorption Features Can Be Observed Betweenmentioning

confidence: 78%

“…The corresponding throughput efficiencies were 67% (5-m fiber) and 15% (108-m fiber), which we believe could be further enhanced by utilizing more advanced low-loss HC-ARF designs, such as conjoined or nested tubes [29,30]. The temporal profile of the MIR laser pulses generated from the OPO was not measured due to the lack of suitable instruments; however, the pulse duration is expected to be similar to that of the OPO pump pulses, which have a Gaussian-like shape and a 120-ps pulse width [26]. For the HCF delivery system, the pulse duration should be maintained through the fiber due to the low dispersion of the HCF (simulated to be 0.2-0.4 ps/nm/km for wavelengths between 3.2 and 3.6 µm) and the relatively narrow pulse spectral bandwidth.…”

Section: (B) Co 2 Gas Absorption Features Can Be Observed Betweenmentioning

confidence: 99%

“…The fiber has a core diameter of 105 µm, defined by seven capillaries with average inner diameters and membrane thicknesses of ∼46.7 µm and ∼1.08 µm, respectively. The fiber structure was specifically designed for delivering the laser beam from our high-power MIR OPO [26]. For example, the membrane thickness was selected to provide a broad fundamental guidance window that widely covered the OPO wavelength tuning range.…”

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confidence: 99%

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Hundred-meter-scale, kilowatt peak-power, near-diffraction-limited, mid-infrared pulse delivery via the low-loss hollow-core fiber

Fu¹,

Wu²,

Davidson³

et al. 2022

Opt. Lett.

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We report a high-power single-mode mid-infrared (MIR) pulse delivery system via anti-resonant hollow-core fiber (HCF) with a record delivery distance of 108 m. Near-diffraction-limited MIR light was transmitted by HCFs at wavelengths of 3.12–3.58 µm using a tunable optical parametric oscillator (OPO) as the light source. The HCFs were purged beforehand with argon in order to remove or reduce loss due to parasitic gas absorption (HCl, CO2, etc.). The minimum fiber loss values were 0.05 and 0.24 dB/m at 3.4–3.6 µm and 4.5–4.6 µm, respectively, with the 4.5–4.6 µm loss figure representing, to the best of our knowledge, a new low loss record for a HCF in this spectral region. At a coupling efficiency of ∼70%, average powers of 592 mW and 133 mW were delivered through 5 m and 108 m of HCF, respectively. Assuming the 120-ps duration of the MIR pulses remained constant over the low-dispersion HCF (theoretical maximum: 0.4 ps/nm/km), the corresponding calculated peak powers were 4.9 kW and 1.1 kW.

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Section: (B) Co 2 Gas Absorption Features Can Be Observed Betweenmentioning

confidence: 78%

Section: (B) Co 2 Gas Absorption Features Can Be Observed Betweenmentioning

confidence: 99%

mentioning

confidence: 99%

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Hundred-meter-scale, kilowatt peak-power, near-diffraction-limited, mid-infrared pulse delivery via the low-loss hollow-core fiber

Fu¹,

Wu²,

Davidson³

et al. 2022

Opt. Lett.

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“…1 引言 2.8 μm附近的中红外波段对应着包括水分子在内的多种有机和无机分子的吸收峰, 因此该波段的激光光源在光谱分析、生物医疗以及遥感等领域具有广泛的应用 [1][2][3] . 与光学参量振荡器 [4] 、掺铒固体激光器 [5] 、量子级联激光器 [6] 等中红外激光的产生方法相比, 基于稀土离子受激发射的掺铒氟化物光纤激光器具有光束质量优良、散热性良好以及柔性产生和传输等特点, 受到广泛关注.…”

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Numerical analysis and optimization of 2.8 μm lightly-erbium-doped fluoride fiber laser based on cascaded transition

Xia,

Fu,

Zhang

et al. 2023

Acta Phys. Sin.

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The Er3+-doped ZBLAN fiber laser is a promising approach for 2.8 μm mid-infrared (MIR) laser. The long lifetime of the lower-laser-level 4I13/2 often results in serious self-terminating effect which harms the laser power and efficiency significantly, especially for the active fiber with low dopant concentration which is preferred for weak thermal issues but can not depopulate the lower-laser-level effectively via the up-conversion process. The 1.6 μm lasing (4I13/2→4I15/2) in Er-ZBLAN fiber could deplete the population on 4I13/2. Therefore, cascaded 2.8 μm and 1.6 μm lasing in Er3+-doped ZBLAN fiber provides a promising solution to the self-termination effects on laser power scaling. Moreover, the 4I13/2→4I15/2 1.6 μm laser also has some overlap with the 4I13/2→4I9/2 excited state absorption (ESA) spectrum. The ions on the 4I9/2 level would then relax to the upper-laser-level of 2.8 μm lasing (4I11/2), and results in enhanced laser efficiency. In general, the 1.6 μm cascaded lasing in 2.8 μm Er-ZBLAN fiber laser involves both lasing and ESA. The two processes have different spectra and different influences on the 2.8 μm laser gain. Therefore, there should exist an optimal wavelength of the 1.6 μm laser, which would balance the two processes, ensure the lower-laser-level depopulation while maximizing the ions recycling. For this consideration, we developed a comprehensive numerical model of cascaded 2.8 μm and 1.6 μm lasers based on Er-ZBLAN fiber. After verifying the validity of the numerical model by using the previous experimental results, the influence of MIR and 1.6 μm lasing wavelengths on the power and conversion efficiency of 2.8 μm laser were investigated thoroughly. The results show that a suitable trade-off between the two processes can be reached with the cascaded lasing wavelength of 1610 nm, for the optimized 2.8 μm laser power/efficiency. Moreover, the influence of 1.6 μm laser cavity feedbacks on the power/efficiency behavior of the 2.8 μm laser is investigated. It is found that very low feedback at 1.6 μm, even only 4% as provided by the Fresnel reflection of the fiber facet, could enable the efficient 1.6 μm laser generation and improve the efficiency of 2.8 μm laser significantly.

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11-μJ Picosecond-Pulsed Hollow-Core-Fibre-Feedback Optical Parametric Oscillator

Wu,

Liang,

et al. 2023

2023 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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High-energy, mid-IR, picosecond fiber-feedback optical parametric oscillator

Cited by 5 publications

References 16 publications

Hundred-meter-scale, kilowatt peak-power, near-diffraction-limited, mid-infrared pulse delivery via the low-loss hollow-core fiber

Hundred-meter-scale, kilowatt peak-power, near-diffraction-limited, mid-infrared pulse delivery via the low-loss hollow-core fiber

Numerical analysis and optimization of 2.8 μm lightly-erbium-doped fluoride fiber laser based on cascaded transition

11-μJ Picosecond-Pulsed Hollow-Core-Fibre-Feedback Optical Parametric Oscillator

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