High pulse energy passive Q-switching of a diode-pumped Tm:YLF laser by Cr:ZnSe

Korenfeld, Arik; Sebbag, Daniel; Ben-Ami, U.; Shalom, Eran; Marcus, Gilad; Noach, Salman

doi:10.1088/1612-2011/12/4/045804

Cited by 27 publications

(17 citation statements)

References 15 publications

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“…The second reason is the lack of suitable high power pump lasers that have sufficient gain over the Raman stimulated threshold. Recent developments in high-power pulsed Tm-doped and Hodoped solid-state lasers in the 2 µm region [5,[11][12][13][14] expands the availability of pump sources that can be used for efficient Raman laser conversion in this spectral range. Those lasers can be designed to have high peak power, linear polarization and narrow bandwidth, characteristics which are often required to match the Raman gain properties [6,8,15,16].The first demonstrations of SRS conversion in 2 µm using Tm:KY(WO 4 ) 2 and BaWO 4 crystals were reported more than a decade ago [17,18].…”

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confidence: 99%

Two-wavelength Tm:YLF/KGW external-cavity Raman laser at 2197 nm and 2263 nm

Sheintop¹,

Sebbag²,

Komm³

et al. 2019

Opt. Express

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This paper presents a KGW Raman laser with an external-cavity configuration at the 2 µm region. The Raman laser is pumped by an actively Q-switched Tm:YLF laser, especially designed for this purpose emitting at 1880 nm. Due to the KGW bi-axial properties, the Raman laser is able to lase separately at two different output lines, 2197 nm and 2263 nm. The output energies and pulse durations that were achieved for these two lines are 0.15 mJ/pulse at 21 ns and 0.4 mJ/pulse at 5.4 ns, respectively. To the best of our knowledge, this is the first time that the KGW crystal, which is well known for its wide use in shorter wavelengths, is demonstrated in a Raman laser in the 2 µm region. According to the achieved results and due to the KGW properties, it appears to be a suitable crystal for energy scaling and efficient Raman conversion in this spectral range. An estimation of the Raman gain coefficient for this wavelength is provided as well. IntroductionIn the past few years, there has been a growing demand for high-power lasers emitting at wavelength beyond 2 μm. Lasers at these "retina-safe" wavelengths have several potential applications, including LIDAR, biomedicine [1], polymer material processing [2], defense applications, and gas sensing [3]. Therefore, 2 µm (SWIR) coherent sources have drawn much attention, as is evident from the recent efforts to develop high power lasers that cover this spectral range [3][4][5].Within this context, solid-state Raman lasers lend themselves to an interesting approach. They are efficient and useful high-brightness sources that extend the spectral span of existing lasers and fill the spectral gaps between them [6-9]. Compared to OPO, Raman lasers have advantages such as narrow linewidth, avoid of phase matching constraints, pulse length shortening and beam quality improvement through Raman beam cleanup [10]. However, solid-state Raman lasers are mostly implemented in the visible and ~1 µm regions and only rarely in the SWIR region. The reasons for this are two fold, first because the stimulated-Raman-scattering (SRS) gain coefficient drops theoretically approximately according to inverse wavelength, resulting in lower efficiency compared to NIR Raman lasers [6]. The second reason is the lack of suitable high power pump lasers that have sufficient gain over the Raman stimulated threshold. Recent developments in high-power pulsed Tm-doped and Hodoped solid-state lasers in the 2 µm region [5,[11][12][13][14] expands the availability of pump sources that can be used for efficient Raman laser conversion in this spectral range. Those lasers can be designed to have high peak power, linear polarization and narrow bandwidth, characteristics which are often required to match the Raman gain properties [6,8,15,16].The first demonstrations of SRS conversion in 2 µm using Tm:KY(WO 4 ) 2 and BaWO 4 crystals were reported more than a decade ago [17,18]. However, these reports lack

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Two-wavelength Tm:YLF/KGW external-cavity Raman laser at 2197 nm and 2263 nm

Sheintop¹,

Sebbag²,

Komm³

et al. 2019

Opt. Express

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“…The Cr:ZnSe gain element of the multi-pass laser amplifier is optically pumped by a home built actively Q-switched Tm:YLF laser, which is an upgrade of an older, passively Qswitched design [28]. Here, the saturable absorber is replaced by an, acousto-optic Q-switch [29].…”

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Carrier-to-envelope phase-stable, mid-infrared, ultrashort pulses from a hybrid parametric generator: Cr:ZnSe laser amplifier system

et al. 2019

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“…• High pulse energy passive Q-switching of a diode-pumped Tm:YLF laser by Cr:ZnSe-a passively Q-switched diode-pumped Tm:YLF laser with polycrystalline Cr:ZnSe as the saturable absorber is demonstrated for the first time [53].…”

Section: • Random Laser In Biological Tissues Impregnated With a Fluomentioning

confidence: 99%

Introducing theLaser PhysicsandLaser Physics Lettershighlights of 2015

McKenna¹

2016

Laser Phys. Lett.

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The International Year of Light 2015 was a landmark for the laser and optics community pointing the way to a bright future for humanity and the environment. It is with great satisfaction that Laser Physics and Laser Physics Letters have published many notable articles that have contributed to the development of light-based technologies and breakthroughs in photonics. In recognition of their high quality, we present a selection of some of the most popular articles published by Laser Physics and Laser Physics Letters throughout 2015, all of which are believed to have the potential to make a high impact on future research directions. Those chosen are recognised for their high-interest with readers and importance in the field, providing a snapshot of the broad subject coverage and international make-up of both journals.Starting this year, we will be recognising and announcing annual highlights of a previous year for both journals. We hope that you find these highlights useful and look forward to publishing more cutting-edge work in the year ahead.Summary of the highlights articles: Physics of lasers• • Experimental investigation of the light shift effect in an optical-magnetic double resonance system-an experimental scheme for studying the light shift effect in an optical magnetic double resonance system by using 4 He atoms is demonstrated [3]. • Enhanced random lasing from a colloidal CdSe quantum dot-Rh6G system-randomlaser action in a system where optical amplification is provided by colloidal CdSe quantum dots triggered by the emission from Rhodamine 6 G is reported [4].• Ultra-short pulse generation in the hybridly mode-locked erbium-doped all-fiber ring laser with a distributed polarizer-ultra-short pulse generation in a dispersion-managed erbium-doped all-fiber ring laser hybridly mode-locked with boron nitride-doped singlewalled carbon nanotubes, in co-action with a nonlinear polarization evolution in the ring cavity with a distributed polarizer, is reported for the first time [5].• Analysis of pump excited state absorption and its impact on laser efficiency-a model to quantify the effect of excited state absorption at the pump wavelength on laser efficiency, threshold and heating is developed [6]. Fibre optics and fibre lasers• 80 fs passively mode-locked Er-doped fiber laser-an Er-doped laser that has an all-fiber design, including the dispersion compensation and external compression stages, forming a robust and compact device, is reported [7].• Bound-state fiber laser mode-locked by a graphene-nanotube saturable absorbermultiple bound states in a linear-cavity fiber laser mode-locked by a mixture of graphene and single-walled carbon nanotubes is experimentally observed [8]. Jarlath McKenna Publisher, Laser Physics and Laser Physics Letters Introducing the Laser Physics and Laser Physics Letters highlights of 2015Laser Physics Letters

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High pulse energy passive Q-switching of a diode-pumped Tm:YLF laser by Cr:ZnSe

Cited by 27 publications

References 15 publications

Two-wavelength Tm:YLF/KGW external-cavity Raman laser at 2197 nm and 2263 nm

Two-wavelength Tm:YLF/KGW external-cavity Raman laser at 2197 nm and 2263 nm

Carrier-to-envelope phase-stable, mid-infrared, ultrashort pulses from a hybrid parametric generator: Cr:ZnSe laser amplifier system

Introducing theLaser PhysicsandLaser Physics Lettershighlights of 2015

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