Diode pumped Ho:YAG and Ho:LuAG lasers, Q-switching and second harmonic generation

Barnes, Norman P.; Amzajerdian, Farzin; Reichle, Donald J.; Carrion, William; Busch, G. E.; Leisher, Paul O.

doi:10.1007/s00340-010-4195-3

Cited by 37 publications

(20 citation statements)

References 19 publications

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“…Barnes et al published a Q-switched Ho:YAG laser pumped by a pulsed InGaAs laser diode that was wavelength stabilized at 1.86 μm and cooled to 5°C [10]. Barnes et al published a Q-switched Ho:YAG laser pumped by a pulsed InGaAs laser diode that was wavelength stabilized at 1.86 μm and cooled to 5°C [10].…”

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confidence: 99%

Directly diode-pumped high-energy Ho:YAG oscillator

et al. 2012

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We report on the high-energy laser operation of an Ho:YAG oscillator resonantly pumped by a GaSb-based laser diode stack at 1.9 μm. The output energy was extracted from a compact plano-concave acousto-optically Q-switched resonator optimized for low repetition rates. Operating at 100 Hz, pulse energies exceeding 30 mJ at a wavelength of 2.09 μm were obtained. The corresponding pulse duration at the highest pump power was 100 ns, leading to a maximum peak power above 300 kW. Different pulse repetition rates and output coupling transmissions of the Ho:YAG resonator were studied. In addition, intracavity laser-induced damage threshold measurements are discussed.

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confidence: 99%

Directly diode-pumped high-energy Ho:YAG oscillator

et al. 2012

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“…Stark splitting in the lower laser manifold of Ho:LuAG ( 5 I 8 ) is relatively larger than that in YAG and YLF, resulting in a low thermal occupation for the lower laser level and hence a reduced lasing threshold at room temperature [10]. Moreover, Ho:LuAG has low upconversion rates and a long upper laser level lifetime that favoring efficient Qswitched operation [11][12][13]. …”

Section: Introductionmentioning

confidence: 97%

High-power 2.1 μm Ho:Lu1.5Y1.5Al5O12 laser in-band pumped by a Tm fiber laser

Chen

Shen

et al. 2011

Laser Phys. Lett.

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We report on a highly efficient Ho:LuYAG laser inband pumped by a high power narrow linewidth Tm fiber laser at 1907 nm. Lasing wavelength of the mixed crystal laser centered at 2124 or 2093 nm depending on the transmittance of the output coupler. With 1.0 at.% Ho 3+ -doped LuYAG crystal and an output coupler of 8% transmission, the laser yielded 21 W of continuous-wave output power at 2124 nm for 35 W of incident pump power, corresponding to a slope efficiency with respect to incident pump power of 61.5%.

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“…As a result, Ho:LuAG is a potential high‐power eye‐safe laser material. In recent years, some studies on the Ho:LuAG single crystals have been carried out . LuAG crystals can be grown by means of the Czochralski or micro‐pulling‐down (μ‐PD) methods.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, some studies on the Ho:LuAG single crystals have been carried out. [12][13][14][15][16][17][18] LuAG crystals can be grown by means of the Czochralski 19,20 or micro-pulling-down (l-PD) 21,22 methods. However, the former needs extremely high temperatures and long preparation periods and the latter is unsuitable to fabricate crystals with large sizes.…”

Section: Introductionmentioning

confidence: 99%

Polycrystalline Ho: LuAG laser ceramics: Fabrication, microstructure, and optical characterization

Xie

et al. 2017

J Am Ceram Soc

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Ho:Lu3Al5O12(LuAG) transparent ceramics are potential 2 μm eye‐safe laser materials. Polycrystalline 0.8 at.% Ho:LuAG ceramics with high optical quality were successfully fabricated by solid‐state reactive sintering of high‐purity oxide powders. The microstructure, the optical transmission, the spectrum characteristic, and the laser performance were investigated in this paper. The average grain size of Ho:LuAG ceramics vacuum sintered at 1830°C for 30 hour is about 14 μm. The in‐line transmittance of the sample is measured to be 81.7% and 82.0% at 1000 and 2250 nm, respectively. The absorption and the emission cross sections are calculated to be 0.88 × 10−20 cm2 at 1906 nm and 1.26 × 10−20 cm2 at 2094 nm. Using a thulium‐doped yttrium‐lithium‐fluoride (Tm:YLF) laser with the central wavelength of 1907.5 nm as the pump source, 2.67 W continuous wave (CW) laser operation at 2100.74 nm was obtained with a slope efficiency of 26.5%. The beam quality factor M2 was calculated to be 1.1, which indicated nearly diffraction‐limited beam propagation and the laser was the fundamental TEM00 Gaussian mode.

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Diode pumped Ho:YAG and Ho:LuAG lasers, Q-switching and second harmonic generation

Cited by 37 publications

References 19 publications

Directly diode-pumped high-energy Ho:YAG oscillator

Directly diode-pumped high-energy Ho:YAG oscillator

High-power 2.1 μm Ho:Lu1.5Y1.5Al5O12 laser in-band pumped by a Tm fiber laser

Polycrystalline Ho: LuAG laser ceramics: Fabrication, microstructure, and optical characterization

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