Diode-end-pumped efficient 2533nm intracavity Raman laser with high peak power

Zhang, Xinlu; Ding, Yan; Qiao, Yu; Li, Guoxing; Cui, Jinhui

doi:10.1016/j.optcom.2015.07.008

Cited by 13 publications

(2 citation statements)

References 30 publications

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“…information about the obtained output energy. Since 2013, several studies have demonstrated crystalline Raman lasers in the 2 to 4 μm region: A BaWO 4 crystal pumped by a Tm:YAP laser emitting at 2360 nm achieved 0.31 mJ of output energy [19], a YVO 4 crystal pumped by a Tm:YAP laser emitting at 2418 nm yielded 0.27 mJ of output energy [20], a BaWO 4 crystal pumped by a Tm,Ho:GdVO 4 laser emitting at 2533 nm obtained 0.31 mJ of output energy [21,22], a BaWO 4 crystal pumped by a Ho:YAG laser emitting at 2602 nm yielded 0.27 mJ of output energy [23], and a diamond crystal pumped by a tunable OPO around 2.4 µm, emitting from 3.38 to 3.80 μm attained up to 0.12 mJ of output energy [24]. The highest conversion efficiency of these lasers was 13.9% (6.8% efficiency from pump diode, for intracavity lasers).…”

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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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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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“…However, these reports are missing the information about the obtained output energy values. Since 2013, several studies have demonstrated crystalline Raman lasers in the 2-4 µm region: A BaWO 4 crystal pumped by a Tm:YAP laser emitting at 2360 nm achieved 0.31 mJ of output energy [11], a YVO 4 crystal pumped by a Tm:YAP laser emitting at 2418 nm yielded 0.27 mJ of output energy [12], a BaWO 4 crystal pumped by a Tm, Ho:GdVO 4 laser emitting at 2533 nm obtained 0.31 mJ of output energy [13,14], and a BaWO 4 crystal pumped by a Ho:YAG laser emitting at 2602 nm yielded 0.27 mJ of output energy [15]. A more recent publication has introduced a Raman laser based on a diamond crystal, which has the highest Raman gain coefficient, pumped by a Tm:YLF at 1.89 µm emitting at 2.52 µm.…”

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confidence: 99%

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

et al. 2021

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This paper presents a KGW Raman laser with an external-cavity configuration in the 2 μm region. The Raman laser is pumped by unique, electro-optic, actively Q-switched Tm:Yap laser, emitting at 1935 nm. The electro-optic modulation is based on a KLTN crystal, enabling the use of a short crystal length, with a relatively low driving voltage. Due to the KGW bi-axial properties, the Raman laser is able to lase separately at two different output wavelengths, 2273 and 2344 nm. The output energies and pulse durations for these two lines are 0.42 mJ/pulse at 18.2 ns, and 0.416 mJ/pulse at 14.7 ns, respectively. This is the first implementation of a KGW crystal pumped by an electro-optic active Q-switched Tm:Yap laser in the SWIR spectral range.

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