Cryogenically cooled, Ho:YAG, Q-switched laser

Ganija, M. R.; Hemming, Alexander; Simakov, Nikita; Boyd, Keiron; Carmody, Neil; Veitch, P. J.; Haub, John; Münch, J.

doi:10.1007/s00340-020-07420-9

Cited by 12 publications

(8 citation statements)

References 28 publications

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“…Compared with AO devices, EO Q-switch has a fast switching speed and high extinction on-off ratio, so it is always used to obtain high peak power lasers. RTP (RbTiOPO4), LN (LiNbO3), and LGS (La3Ga5SiO14) have been used to make Q-switches and then to modulate and get pulsed 2 μm lasers [15][16][17]. Among the above piezoelectric crystals, LGS has a high damage threshold, non-deliquescent resistance, and high transmittance in the 2 μm spectral range which made it widely used to operate 2 μm lasers in recent years.…”

Section: Introductionmentioning

confidence: 99%

Electro-optically Q-switching performance of diode-pumped HoGdVO4 laser

Duan

Ding³

et al. 2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

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We proposed a Ho:GdVO4 laser operating at 2.05 µm which was directly in-band dual-end-pumped by a pair of 1.94 μm fiber-coupled laser diodes (LD). A Ho:GdVO4 crystal with doping of 1.0 at.% was used as the gain medium. In continuous-wave (CW) mode, we obtained the maximum output power of 6.5 W at 2047.9 nm with the absorbed pump power of 28 W, corresponding to a slope efficiency of 37.6 %. By using an LGS crystal as the electro-optical Q-switch, the highest peak power of 773.8 kW was obtained at a pulse repetition frequency (PRF) of 1 kHz, corresponding to a maximum pulse energy of 3.25 mJ and a pulse width of 4.2ns.

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Section: Introductionmentioning

confidence: 99%

Electro-optically Q-switching performance of diode-pumped HoGdVO4 laser

Duan

Ding³

et al. 2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

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“…Using directly pumped 1940 nm Tm lasers decreases the thermal load and ETU process [4]. The cryogenic temperature was used to overcome the thermal limitation [12,13]. Ho:YLF laser crystal at room temperature is a quasithree-level laser; thus, gain/absorption saturation occurs [14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermal effect on the output characteristics of end-pumped Ho:YLF laser in concave–concave and concave–convex resonators

Tooski¹,

Maleki²,

Ebadian³

et al. 2023

Laser Phys.

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The thermal effect on the output characteristics was analyzed in an end-pumped Ho:YLF laser by applying the Kirchhoff integral analytic solution and finite element analysis using LASCAD software. At a Tm:fiber laser power of 70 W, the maximum temperature of a Ho:YLF crystal with 8 mm diameter was found to be 297.6 K. The temperature distribution results of the two calculation methods were matched with an acceptable error. The calculated thermal lens focal length for the maximum power was −985 and −976 mm in the 3 and 8 mm diameter rods, respectively. The simulation results showed that for the larger diameter crystal, the thermal lens effect is less. Moreover, in this study, the calculation results were validated as experimental results. A focal length of the thermal lens of −1012.6 ± 101.26 mm at double-pass pumping was measured. The experimental study showed that laser characteristics such as the far-field divergence angle were improved in the concave–convex resonator with 0.5% Ho:YLF crystal. The experimentally measured divergence angle was 0.7 mrad, which confirms the simulation results. The output power was 13.5 W, corresponding to 19.3% optical-to-optical efficiency.

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“…10,11 Currently, the main way to achieve 2 µm laser output is to utilize the energy level transition of trivalent rare earth ions, including Tm 3+ doped, Ho 3+ doped, Tm 3+ -Ho 3+ co-doped or Ho 3+ co-doped with other ions lasers. [12][13][14] Among these technical approaches, Tm 3+ -doped crystal is restricted in the applications in passively Q-switched (PQS) technology as a result of the small emission cross-section, short energy level lifetime, and poor energy storage capacity. 15 Ho 3+ doped crystal depends on Tm 3+ doped solid-state laser as pump source, which may lead to very complex laser structure.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, 2 µm pulsed lasers are efficient pump sources for nonlinear optical frequency conversion in the range of 3–12 µm 10,11 . Currently, the main way to achieve 2 µm laser output is to utilize the energy level transition of trivalent rare earth ions, including Tm 3+ doped, Ho 3+ doped, Tm 3+ ‐Ho 3+ co‐doped or Ho 3+ co‐doped with other ions lasers 12–14 . Among these technical approaches, Tm 3+ ‐doped crystal is restricted in the applications in passively Q‐switched (PQS) technology as a result of the small emission cross‐section, short energy level lifetime, and poor energy storage capacity 15 .…”

Section: Introductionmentioning

confidence: 99%

Passively Q‐switched operation of Yb,Ho:LuVO₄ laser with a semiconductor saturable absorber mirrors

Yang

Wang

Zeng

et al. 2022

Micro & Optical Tech Letters

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A continuous-wave (CW) and passively Q-switched (PQS) Yb,Ho:LuVO 4 laser pumped by a 978.6-nm laser diode (LD) is demonstrated. The maximum output power of 131 mW at 2059.78 nm in CW regime is achieved with a pump power of 3.01 W, corresponding to a slope efficiency of 10.74%. Under PQS mode operation, an average output power of 45 mW and a shortest pulse width of 100 ns were acquired by a semiconductor saturable absorber mirrors, and for all we know, this is the first report about the PQS Yb,Ho:LuVO 4 laser. In addition, a maximum energy per pulse of 12.6 nJ with a pulse repetition frequency of 7.692 MHz was obtained, corresponding to a peak power of 58.5 mW. The beam quality factor was measured to be M x 2 = 1.10 and M y 2 = 1.10 from the PQS Yb,Ho:LuVO 4 laser.

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Cryogenically cooled, Ho:YAG, Q-switched laser

Cited by 12 publications

References 28 publications

Electro-optically Q-switching performance of diode-pumped HoGdVO4 laser

Electro-optically Q-switching performance of diode-pumped HoGdVO4 laser

Investigation of thermal effect on the output characteristics of end-pumped Ho:YLF laser in concave–concave and concave–convex resonators

Passively Q‐switched operation of Yb,Ho:LuVO₄ laser with a semiconductor saturable absorber mirrors

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Cryogenically cooled, Ho:YAG, Q-switched laser

Cited by 12 publications

References 28 publications

Electro-optically Q-switching performance of diode-pumped HoGdVO4 laser

Electro-optically Q-switching performance of diode-pumped HoGdVO4 laser

Investigation of thermal effect on the output characteristics of end-pumped Ho:YLF laser in concave–concave and concave–convex resonators

Passively Q‐switched operation of Yb,Ho:LuVO4 laser with a semiconductor saturable absorber mirrors

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Passively Q‐switched operation of Yb,Ho:LuVO₄ laser with a semiconductor saturable absorber mirrors