Two-mJ level, high-energy all-passive KGW/Tm:YLF Raman laser

Gelbach, Nachmen; Neustadter, Yaakov; Henig, Menachem; Nahear, Rotem; Noach, Salman

doi:10.1364/ol.495888

Cited by 2 publications

References 28 publications

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A continuous-wave Nd:YVO₄-KGW intracavity Raman laser with over 34% diode-to-Stokes optical efficiency

Sheng,

Geng,

Liu

et al. 2024

High Pow Laser Sci Eng

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We demonstrate a continuous-wave (CW) Nd:YVO 4 -potassium gadolinium tungstate (KGW) intracavity Raman laser with a diode-to-Stokes optical efficiency of 34.2%. By optimizing the cavity arrangement and reducing the cavity losses, 8.47 W Stokes output at 1177 nm was obtained under an incident 878.6 nm diode pump power of 24.8 W. The influence of cavity losses on the power and efficiency of the CW Raman laser, as well as the potential for further optimization, was investigated based on the numerical model. The observation of thermally-induced output rollover was well explained by the calculation of the thermal lensing and cavity stability, indicating that the end-face curvature played an important role when the end-face of the crystal was highly reflective coated to make the cavity. A 10.9 W Stokes output under 40.9 W incident pump was also demonstrated with a cavity arrangement less sensitive to the end-face curvature, which is the highest output power of CW intracavity Raman lasers reported.

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A continuous-wave Nd:YVO₄-KGW intracavity Raman laser with over 34% diode-to-Stokes optical efficiency

Sheng,

Geng,

Liu

et al. 2024

High Pow Laser Sci Eng

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High energy and high conversion efficiency Tm based /KGW Raman laser in the SWIR spectral range

Neustadter,

Gelbach,

Sebbag

et al. 2024

Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII

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For many years, the KGW Raman crystal has been widely used as a Raman gain medium for lasers in the visible spectrum. This paper presents recent advancements in SWIR Raman lasers, successfully implementing the KGW crystal as the gain medium in the SWIR spectral range. The KGW Raman gain coefficient is inversely proportional to the wavelength, potentially lowering the efficacy for longer wavelengths. However, the high damage threshold (exceeding 10 GW/cm 2 ), a decent thermal conductivity coefficient 1 as well as a highly integrated scattering cross-section 2 effectively overcome this challenge. This paper summarizes results of different Tm based/KGW Raman lasers in external cavity configurations. Due to the KGW bi-axial properties, the Raman laser emits two discrete shifted wavelengths. The first system used a Tm:YLF pump laser and was actively Q-switched, producing short pulses of 5.4 ns. The system was the first demonstration of SWIR Raman lasing using a KGW gain medium. The second configuration used a Tm:YAP pump source and was successfully passively Q-switched using a Cr:ZnS SA resulting in output energies of 340 µJ/pulse and 450 µJ/pulse for the respective Raman wavelengths. The third Raman laser achieved a record maximum energy per pulse of 2.08 mJ for the 901 cm −1 Stokes shift utilizing a passively Q-switched Tm:YLF pump laser. To the best of our knowledge, these results present a successful demonstration of SWIR Raman conversion using KGW as the Raman gain medium, along with significant advancements in terms of conversion efficiencies and energy per pulse.

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Two-mJ level, high-energy all-passive KGW/Tm:YLF Raman laser

Cited by 2 publications

References 28 publications

A continuous-wave Nd:YVO₄-KGW intracavity Raman laser with over 34% diode-to-Stokes optical efficiency

A continuous-wave Nd:YVO₄-KGW intracavity Raman laser with over 34% diode-to-Stokes optical efficiency

High energy and high conversion efficiency Tm based /KGW Raman laser in the SWIR spectral range

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Two-mJ level, high-energy all-passive KGW/Tm:YLF Raman laser

Cited by 2 publications

References 28 publications

A continuous-wave Nd:YVO 4 -KGW intracavity Raman laser with over 34% diode-to-Stokes optical efficiency

A continuous-wave Nd:YVO 4 -KGW intracavity Raman laser with over 34% diode-to-Stokes optical efficiency

High energy and high conversion efficiency Tm based /KGW Raman laser in the SWIR spectral range

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A continuous-wave Nd:YVO₄-KGW intracavity Raman laser with over 34% diode-to-Stokes optical efficiency

A continuous-wave Nd:YVO₄-KGW intracavity Raman laser with over 34% diode-to-Stokes optical efficiency