An Electro-Optic, Actively Q-Switched Tm:YAP/KGW External-Cavity Raman Laser at 2273 nm and 2344 nm

Nahear, Rotem; Suliman, Neria; Bach, Yechiel; Noach, Salman

doi:10.3390/photonics8110519

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…A similar system was demonstrated 22 utilizing an electro-optic, actively Q-switched Tm:Yap laser, emitting at 1935 nm as the pump laser. The electro-optic modulation was based on a KLTN crystal, and the Raman output wavelengths were 2273 and 2344 nm.…”

Section: Methodsmentioning

confidence: 99%

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: Methodsmentioning

confidence: 99%

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

Self Cite

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High peak power passively Q-switched Tm:YAP solid-state laser with Cr2+:ZnSe and Cr2+:ZnS saturable absorber

Wu,

Zhang,

Zhu

et al. 2024

Physica B: Condensed Matter

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Watt-level output power and near-diffraction-limit beam quality mid-infrared Ho:GdVO₄ self-Raman laser at 2.5 µm

Kang,

Zhang,

Jing

et al. 2024

Opt. Express

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We demonstrate an efficient active Q-switched Ho:GdVO4 self-Raman laser at 2500 nm for the first time, to our knowledge. Using Ho:GdVO4 crystal as the gain medium for both the 2048nm fundamental laser and the 2500 nm Raman laser, the output performances of a new mid-infrared self-Raman laser were investigated. The maximum average output power of 1.45 W was achieved at an incident pump power of 22.5 W, with a slope efficiency of 25.8%, for an output transmittance of 30% and a pulse repetition frequency of 15 kHz. The maximum single pulse energy of 96.7 µJ with a pulse width of 11.35 ns was obtained, corresponding to the peak power of 8.5 kW. The beam quality was near diffraction limited with the M2 factors of 1.15 and 1.06 along the x and y directions. Moreover, adopting the two-end output way of the fundamental laser and the Raman laser, the Raman gain coefficient of Ho:GdVO4 crystal was estimated to be 1.14 cm/GW at 2048nm. This work shows that Ho:GdVO4 is an excellent self-Raman laser crystal for the generation of high power Raman laser at 2.5 µm.

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An Electro-Optic, Actively Q-Switched Tm:YAP/KGW External-Cavity Raman Laser at 2273 nm and 2344 nm

Cited by 4 publications

References 25 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

High peak power passively Q-switched Tm:YAP solid-state laser with Cr2+:ZnSe and Cr2+:ZnS saturable absorber

Watt-level output power and near-diffraction-limit beam quality mid-infrared Ho:GdVO₄ self-Raman laser at 2.5 µm

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An Electro-Optic, Actively Q-Switched Tm:YAP/KGW External-Cavity Raman Laser at 2273 nm and 2344 nm

Cited by 4 publications

References 25 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

High peak power passively Q-switched Tm:YAP solid-state laser with Cr2+:ZnSe and Cr2+:ZnS saturable absorber

Watt-level output power and near-diffraction-limit beam quality mid-infrared Ho:GdVO4 self-Raman laser at 2.5 µm

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Product

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About

Watt-level output power and near-diffraction-limit beam quality mid-infrared Ho:GdVO₄ self-Raman laser at 2.5 µm