Power Scaling of CW Crystalline OPOs and Raman Lasers

Sarang, Soumya; Richardson, Martin

doi:10.3390/photonics8120565

Cited by 3 publications

(3 citation statements)

References 160 publications

(180 reference statements)

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“…For crystalline Raman lasers, most of the studies from the last decade [6][7][8][9] have focused on increasing the average power of lasers operating in continuous-wave (CW) mode, or generating pulses with a high repetition rate (~10 5 Hz) and relatively low (<1 mJ) energy. In these cases, the Raman gain coefficient required for the efficient conversion of the pump radiation into Stokes components is achieved only if the pump radiation is concentrated in a spot of relatively small (<0.2 mm) size.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, the angular acceptance of this crystal is relatively small, so a good SHG efficiency can be obtained only for radiation with a high beam quality. This method was used in [6][7][8][9], where Raman lasers with a small pump spot size were operated at low-order transversal modes. However, in our approach, increasing the pumping beam spot size led to a considerable increase in the Raman laser beam angular divergence, which results in a low SHG efficiency.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wavelength Conversion of Multi-Joule Energy 532 nm Pulse Bursts via a Potassium Gadolinium Tungstate Raman Laser

Tarasov,

Chu

2023

Applied Sciences

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In this study, pulse bursts at 559, 589, and 621 nm, with a record energy of ~10 J, are generated using a KGW Raman laser with an external resonator, while pumping at 532 nm. The pulse bursts have a 10 ms duration, and consist of 78 subpulses with a duration of <10 ns, at 8 kHz. The maximum energy of the bursts is restricted only by the characteristics of the Nd: YAG laser used as the 532 nm pump source, and can be increased.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wavelength Conversion of Multi-Joule Energy 532 nm Pulse Bursts via a Potassium Gadolinium Tungstate Raman Laser

Tarasov,

Chu

2023

Applied Sciences

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“…Raman lasers are based on different materials, including bulk elements made of crystals and glasses [5,6], glass fibers [3,7], gas-filled fibers [8,9], microresonators made of glass and crystalline materials [10,11], gases in cells [12], and others. An active medium and a resonator are frequently required for creating lasers, including Raman ones [1] (although random distributed feedback (DFB) lasers with a mirrorless open cavity are also known [13]).…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study of Multicascade Raman Microlasers Based on TeO2–WO3–Bi2O3 Glass

Anashkina,

Marisova,

Andrianov

2023

Photonics

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The development and investigation of miniature narrow-line coherent light sources based on microresonators with low-power-consumption whispering gallery modes (WGMs) is an actual trend in modern photonics. Raman WGM microlasers can operate at wavelengths inaccessible to traditional laser media and provide a huge pump frequency tuning range. Here, we propose and theoretically study multicascade Raman microlasers based on soft tellurite TeO2–WO3–Bi2O3 glass WGM microresonators (microspheres) which can operate in the near-IR and mid-IR with the pump in the telecommunication range. Thanks to a large Raman gain (120 times exceeding the maximum Raman gain of silica glass) and a huge Raman frequency shift of 27.5 THz for this glass, the Raman waves at 1.83 µm, 2.21 µm, 2.77 µm, and 3.7 µm in the first, second, third, and fourth cascades, respectively, are theoretically demonstrated with a pump at 1.57 µm. We analyze in detail the influence of different factors on the characteristics of the generated Raman waves, such as microsphere diameters, Q-factors, pump powers, and detuning of the pump frequency from exact resonance. We also solve a thermo-optical problem to show that the temperature of a soft glass microresonator heated due to partial thermalization of pump power remains below the glass transition temperature. To the best of our knowledge, mid-IR tellurite glass Raman WGM microlasers have not been studied before.

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High Power and Efficient 4.43 μm BaGa4Se7 Optical Parametric Oscillator Pumped at 1064 nm

et al. 2022

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A high power and efficiency mid-infrared optical parametric oscillator based on a BaGa4Se7 crystal is demonstrated in this paper. It was pumped by a 500 Hz Q-switched Nd:YAG laser at room temperature. Without cooling, up to 0.76 W output power at 4.43 μm was generated with respect to the incident pump power (1064 nm) of 5.52 W, corresponding to an optical-to-optical conversion efficiency of 13.7%. The corresponding slope efficiency was as high as 18.7%. The pulse width of the signal wave was 5.2 ns at the pump pulse of 13.7 ns. To the best of our knowledge, this is to date the highest output power achieved at 4–5 μm from a 1064 nm pumped BGSe OPO laser. Considering that no additional cooling system was applied, this work provides a good solution for a high-efficient, compact or even portable mid-infrared solid-state laser device.

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Power Scaling of CW Crystalline OPOs and Raman Lasers

Cited by 3 publications

References 160 publications

Wavelength Conversion of Multi-Joule Energy 532 nm Pulse Bursts via a Potassium Gadolinium Tungstate Raman Laser

Wavelength Conversion of Multi-Joule Energy 532 nm Pulse Bursts via a Potassium Gadolinium Tungstate Raman Laser

Theoretical Study of Multicascade Raman Microlasers Based on TeO2–WO3–Bi2O3 Glass

High Power and Efficient 4.43 μm BaGa4Se7 Optical Parametric Oscillator Pumped at 1064 nm

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