Diode-end-pumped actively Q-switched YVO4 Raman laser at 2291nm

Duan, Sihou; Ren, Xinyi; Xie, Ju; Yu, Yongqin; Du, Chenlin

doi:10.1117/12.2524419

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…Harnessing the SRS effect for lasing in the 2 µm range is challenging since the Raman gain coefficient is inversely proportional to the wavelength [9][10] . In this wavelength range, YVO4 and BaWO4 crystals, along with diamond, have been implemented successfully as Raman gain mediums [11][12][13] , demonstrating that SRS is a viable method for obtaining wavelengths in the 2 µm spectral range. One of the well-known Raman gain mediums for Raman lasers operating in the visible spectral range is potassium gadolinium tungstate (KGW) due to its favorable optical and thermal properties 14 .…”

Section: Introductionmentioning

confidence: 96%

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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Section: Introductionmentioning

confidence: 96%

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

Gelbach,

Neustadter,

Henig

et al. 2023

Opt. Lett.

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This paper presents an all-passive external cavity KGW Raman laser in the 2-μm spectral range, pumped by a Tm:YLF laser at 1879.5 nm. The Raman laser emits two lines at 2197 nm and 2263 nm achieving maximum energy outputs of 1.86 mJ and 2.08 mJ, and conversion efficiencies of 40% and 45.3%, respectively. To the best of our knowledge, this laser performance is a new record in terms of energy per pulse and conversion efficiency, surpassing the two-mJ level for the first time by stimulated Raman scattering in the 2-μm range in an all-passive configuration.

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Diode-end-pumped actively Q-switched YVO4 Raman laser at 2291nm

Cited by 2 publications

References 15 publications

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

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

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

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