Intracavity CH 4 Raman laser using negative-branch unstable resonator

Zhou, Danhong; Guo, Jingwei; Zhou, Can-Hua; Wang, Zhibin; Jin, Yuqi

doi:10.1016/j.optcom.2015.07.025

Cited by 12 publications

(2 citation statements)

References 18 publications

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“…In contrast, gas Raman cells can withstand much higher pumping powers but in the meantime face the problem of a higher SRS threshold. A couple of techniques, such as multipass Herriott cells, intracavity design, seeding injection, multifocus configuration, etc., can be utilized to lower the threshold. − The most common and simplest route is to apply high-pressure Raman active gases; on this basis, special attention must be paid to suppress adverse effects of laser-induced breakdown (LIB).…”

Section: Introductionmentioning

confidence: 99%

Inhibiting Effect of Topological Charge on Laser-Induced Breakdown of Gases: Miniaturization of an SRS Laser with Vortex Raman Outputs

Sun,

Jia,

Cai

et al. 2024

ACS Photonics

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Stimulated Raman scattering (SRS) lasers equipped with bulky gas cells have been widely criticized. The special "donut″-shaped intensity distribution of vortex light (VL) is expected to reduce the pump laser intensity, suppress laser-induced breakdown, and fulfill the laser miniaturization. In this work, spiral phase plates of different topological charges (l = 1,2,4) have been employed to convert the l = 0 flattened Gaussian beam (FGB) into VLs, which served as pump sources. Lenses with focal lengths of F = 1000, 400, and 200 mm were chosen and coupled with Raman cells of L = 1.8, 0.9, and 0.23 m, respectively, to investigate the effects of l on photon conversion efficiency (PCE), beam quality, and the output orbital angular momentums (OAMs). The optimal l under different focusing parameters was proved to be dependent on the pump energy and gas pressure. By focusing the l = +4 laser via an F = 200 mm lens into a L = 0.23 m Raman cell, a first-order Stokes (S1) PCE of up to 61.5% was achieved at a pump energy of 62.1 mJ, which is comparable with the 66.4% obtained with an F = 1000 mm lens focusing the l = 0 FGB in a L = 1.8 m cell. Next, the S1 Raman beam quality at high pressure was verified to be significantly improved from β o0 = 6.3 (l = 0) to β o2 = 3.6 (l = 2) at 0.8 MPa H 2 . Furthermore, moduli and signs of average Raman OAMs were visualized with an F = 1.5 m cylindrical lens, and the results verified the law of OAM conservation in our SRS scheme.

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Section: Introductionmentioning

confidence: 99%

Inhibiting Effect of Topological Charge on Laser-Induced Breakdown of Gases: Miniaturization of an SRS Laser with Vortex Raman Outputs

Sun,

Jia,

Cai

et al. 2024

ACS Photonics

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“…For example: anti-stokes Raman laser of hydrogen pumped by excimer laser could reach as short wavelength as 118 nm [1], and could be used in high capacity data storage etc.. SRS of CO 2 pumped by the forth harmonic of Nd:YAG could generate UV lasers of 287 nm and 299 nm, and they could be used as light source of lidar for the measurement of ozone concentration [2]. When Nd:YAG laser was used as pump source, wavelengths of rst Stokes Raman lasers of hydrogen or methane are 1.91 µm or 1.54 µm [3,4], the wavelength of the second Stokes Raman laser of deuterium is 2.92 µm [5]; and they could be used as light sources of surgery, remote sensing and organic molecule detection etc.. Stimulated Rotational Raman Scattering (SRRS) of para-hydrogen pumped by TEA CO 2 laser generated FIR laser of 16 µm, and could be used for the isotope separation [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of spectrum of rotational resolve spctrum of collimated CO2 Raman laser

Liu

et al. 2022

Preprint

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In this work, a pulsed 1064 nm laser was used as pump source, high pressure CO2 gas was used as Raman medium, and a spectrum up to 12 anti-Stokes and 2 Stokes collimated vibrational Raman lasers was obtained. When higher pumping energy and high resolution spectrometer were applied, a rotational resolved spectrum of collimated CO2 Raman laser was achieved. By the Boltzmann population distribution and Raman gain coefficient analysis, mechanism of stimulated pure rotational Raman scattering was eliminated, and stimulated S-branch vibrational Raman scattering process was identified; by multiple four-wave-maxing (FWM) processes, a spectrum with multiple rotational Raman structure was achieved. Raman gain of Stimulated S-branch vibrational Raman scattering covered a range of more than ten wavenumbers, and was estimated about 5.5 times smaller than that of Stimulated Q-branch vibrational Raman scattering.

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Error analysis of the virtual-source method

Huang

Tang

et al. 2017

Optik

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Intracavity CH 4 Raman laser using negative-branch unstable resonator

Cited by 12 publications

References 18 publications

Inhibiting Effect of Topological Charge on Laser-Induced Breakdown of Gases: Miniaturization of an SRS Laser with Vortex Raman Outputs

Inhibiting Effect of Topological Charge on Laser-Induced Breakdown of Gases: Miniaturization of an SRS Laser with Vortex Raman Outputs

Investigation of spectrum of rotational resolve spctrum of collimated CO2 Raman laser

Error analysis of the virtual-source method

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