Pump–Probe Measurements of the Raman Gain Coefficient in Crystals Using Multi-Longitudinal-Mode Beams

Sabella, Alexander; Spence, David J.; Mildren, Richard P.

doi:10.1109/jqe.2015.2503404

Cited by 23 publications

(14 citation statements)

References 37 publications

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“…In addition the bandwidths of the pump and Stokes (

Δ ω_{P}

and

Δ ω_{S} \approx 0.83

cm −1 ) are significant compared to the Raman linewidth (

Δ ω_{R} = 1.5

cm −1 ) and a correction factor of 0.46 was applied . Collinear pump and seed beams show strong amplification, with fitted parameter

g_{0} = 10.5

cm/GW (corrected for relative linewidths) with an experimental error of less than 15% based on repeated experiments; a value in good agreement with many reported Raman gain coefficients measurements for diamond as reviewed recently in .…”

Section: Resultssupporting

confidence: 83%

Diamond‐based concept for combining beams at very high average powers

McKay

Spence

Coutts

et al. 2017

Laser & Photonics Reviews

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Ever since the laser's invention, there has been great interest in increasing beam output power without detriment to its coherence. Despite great advances having been obtained through the use of a diverse range of approaches, steady‐state beam powers above ten kilowatts remain a significant challenge for solid‐state lasers due to the heightened impact of detrimental nonlinear effects such as thermal lensing. Multiplexing several lasers using beam combination represents a method for surpassing the power barriers of single lasers. Here we propose and demonstrate a novel approach to beam combination and power scaling based on Raman conversion in diamond. Power from multiple non‐collinear pump beams is efficiently transferred onto a single Stokes beam in a single‐pass amplifier. Using three mutually‐independent nanosecond pulsed beams from a free‐running‐linewidth 1064 nm laser, 69% of the total peak pump power of 6.7 kW was transferred onto a TEM00 Stokes seed pulse at 1240 nm in a 9.5 mm long diamond crystal. Compared to other beam combination techniques, diamond beam combination has advantages of relaxed constraints on pump beam mutual coherence, while enabling narrowband output. Thermal considerations for extending from low duty‐cycle to continuous wave operation and higher power levels are discussed.

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“…In addition the bandwidths of the pump and Stokes (

Δ ω_{P}

and

Δ ω_{S} \approx 0.83

cm −1 ) are significant compared to the Raman linewidth (

Δ ω_{R} = 1.5

cm −1 ) and a correction factor of 0.46 was applied . Collinear pump and seed beams show strong amplification, with fitted parameter

g_{0} = 10.5

Section: Resultssupporting

confidence: 83%

Diamond‐based concept for combining beams at very high average powers

McKay

Spence

Coutts

et al. 2017

Laser & Photonics Reviews

Self Cite

View full text Add to dashboard Cite

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“…The Raman gain coefficient for diamond of 3.80 ± 0.35 cm/GW at a pump wavelength of 1.864 µm was measured in [30]. This is higher than the estimated effective Raman gain, mainly due to already mentioned spatial and spectral overlap factors.…”

Section: Resultsmentioning

confidence: 68%

100 kW peak power external cavity diamond Raman laser at 252 μm

Demetriou¹,

Kemp²,

Savitski³

2019

Opt. Express

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We report an external cavity diamond Raman laser operating at 2.52 μm, pumped by a 1.89 μm Tm:LiYF4 (YLF) laser. The maximum pulse energy at 2.52 μm is 1.67 mJ for 4.4 mJ of pump, yielding a conversion efficiency of 38%. The best slope efficiency is ~60% and the Raman pulse duration is between 11 and 15 ns for ~33 ns pump pulse duration. The peak power at 2.52 μm is >100 kW. This demonstration of a Thulium laser pumped diamond Raman laser paves the way for accessing the industrially important wavelength region of ~2.5 μm.

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“…Exploiting the high Raman gain in diamond [12,13], it has been previously demonstrated that near quantum limited conversion efficiencies of 532 nm nanosecond pulses can be achieved in a 2-mm long, monolithic Raman cavity [3]. Such resonators should also be short enough to efficiently convert sub-100 ps pulses by allowing several round trips of the intracavity Raman field per pump pulse.…”

Section: Introductionmentioning

confidence: 99%

Sub-100 ps Monolithic Diamond Raman Laser Emitting at 573 nm

Nikkinen

Savitski

Reilly

et al. 2018

IEEE Photon. Technol. Lett.

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Abstract-We report a compact and efficient picosecond diamond Raman laser at 573 nm wavelength. The laser consists of a 0.5 mm thick single-crystal synthetic diamond coated to form a plane-plane laser resonator, and pumped at 532 nm by a frequency-doubled Q-switched microchip laser system. The pump delivers 85 ps pulses at 100 kHz repetition rate at a maximum average power of ~500 mW. We demonstrate 1st Stokes emission from the diamond Raman laser with maximum power of 175 mW, corresponding to a conversion efficiency of 47% and a pulse duration of 71 ps. Substantial pulse shortening is obtained by proper adjustment of the pump spot diameter on the diamond sample. A minimum pulse duration of 39 ps is reported for a conversion efficiency of 36% and 150 mW output power. The simplicity of the architecture makes the system highly appealing as a yellow picosecond laser source.

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Pump–Probe Measurements of the Raman Gain Coefficient in Crystals Using Multi-Longitudinal-Mode Beams

Cited by 23 publications

References 37 publications

Diamond‐based concept for combining beams at very high average powers

Diamond‐based concept for combining beams at very high average powers

100 kW peak power external cavity diamond Raman laser at 252 μm

Sub-100 ps Monolithic Diamond Raman Laser Emitting at 573 nm

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