High power cryogenic Ho:YAG laser

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

doi:10.1364/oe.25.031889

Cited by 21 publications

(14 citation statements)

References 21 publications

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“…This can be explained by the presence of two effects -rising up-conversion mentioned above and increasing thermal load due to the higher pump absorption density. Among the other bulk Ho:YAG studies, doping concentrations spread from 0.3 % to 1 % [25,48,[57][58][59][60], confirming that lower doping concentration are beneficial in this geometry. In contrast to bulk lasers, TDLs allow for significantly higher pumping intensities due to the improved heat removal, but pumping volume is comparatively small.…”

Section: Higher Doping Concentrationsmentioning

confidence: 59%

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Moving towards high-power thin-disk lasers in the 2 µm wavelength range

et al. 2021

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Thin-disk lasers (TDLs) have made spectacular progress in the last decades both in continuous-wave and ultrafast operation. Nowadays, single thin-disk oscillators with > 16 kW of continuous-wave (CW)-power have been demonstrated and ultrafast amplifiers have largely surpassed the kilowatt milestone with pulse energies in the multi-100 mJ range. This amazing development has been demonstrated in the 1-µm wavelength range, using Yb-doped materials and supported by industrially available components. Motivated by both strong scientific and industrial applications, interest in expanding this performance to longer wavelength regions continues to increase. In particular, TDLs emitting directly in the short-wave mid-infrared (SW-MIR) region (2-3 µm) are especially sought after, and although many early studies have been reported, most remained in the proof-of-principle stage and the potential for multi-100-W operation remained undemonstrated. Here, we report on our recent results of a single fundamental-mode CW Ho:YAG thin-disk oscillator with >100 W of power, surpassing previous single-mode TDLs by a factor of >4, and marking a first milestone in the development of high-power SW-MIR TDLs. In optimized conditions, our laser system emitting at » 2.1 µm reaches an output power of 112 W with 54.6-% optical-to-optical efficiency and an M 2 = 1.1. This system is ideally suited for future direct modelocking at the 100 W level, as well as for ultrafast amplification. We start the discussion with a review of the state-of-the-art of TDLs emitting directly in the vicinity of 2 µm, and then discuss difficulties and possible routes both towards ultrafast operation and next possible steps for power scaling.

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Section: Higher Doping Concentrationsmentioning

confidence: 59%

“…Further advances have also been recently made in ultrafast operation, reaching the kW level [23]. With slab lasers, an output power of 148 W was achieved with Tm:YLF in 2009 and 65 W with Ho:YAG in 2017 [24,25], and further scaling remains to be explored.…”

Section: Introduction and State-of-the-artmentioning

confidence: 99%

Moving towards high-power thin-disk lasers in the 2 µm wavelength range

et al. 2021

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“…High power free-space CW oscillators have also been demonstrated, including a 200 W Tm:YAG laser [ref] and a 65 W cryogenic Ho:YAG laser that produced a 100 W output at 2097 nm with good beam quality [119].…”

Section: Laser Candidate Technologies and Examplesmentioning

confidence: 99%

A Cryogenic Silicon Interferometer for Gravitational-wave Detection

Adhikari,

Aguiar,

Arai

et al. 2020

Preprint

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The detection of gravitational waves from compact binary mergers by LIGO has opened the era of gravitational wave astronomy, revealing a previously hidden side of the cosmos. To maximize the reach of the existing LIGO observatory facilities, we have designed a new instrument that will have 5 times the range of Advanced LIGO, or greater than 100 times the event rate. Observations with this new instrument will make possible dramatic steps toward understanding the physics of the nearby universe, as well as observing the universe out to cosmological distances by the detection of binary black hole coalescences. This article presents the instrument design and a quantitative analysis of the anticipated noise floor. ‡ 1/e 2 intensity § Round-trip loss; see section 5.2

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“…Cryogenic cooling has been extensively studied for scaling the power of quasi-three-level Yb 3+ -, Ho 3+ -, and Nd 3+ -doped YAG lasers [38][39][40], demonstrating prominent benefits in reducing reabsorption loss, increasing emission cross-section, and improving the thermo-optical properties of the gain media. Recent results show that monolithic Nd:YAG lasers can deliver an output power of over 30 W at 946 nm under cryogenic cooling, corresponding to a slope efficiency of up to 78% [41], which provides an efficient method for scaling the power of a 937 nm Nd:GYSGG laser.…”

Section: Nd:gysgg Laser Operating In the 09-095 μM Rangementioning

confidence: 99%

“…A successful implementation was demonstrated through a dual-band Nd:GYSGG laser at 0.94 µm and 1.06 µm [42]. As shown in Figure 8, the power ratio of the two bands could be stably and repeatably tuned at a large scale: the power proportion at 1.06 µm was tuned from 12.4 to 100% while the working temperature was increased from 2 to 20 • C under an incident pump power of 3.14 W. Cryogenic cooling has been extensively studied for scaling the power of quasi-three-level Yb 3+ -, Ho 3+ -, and Nd 3+ -doped YAG lasers [38][39][40], demonstrating prominent benefits in reducing reabsorption loss, increasing emission cross-section, and improving the thermo-optical properties of the gain media. Recent results show that monolithic Nd:YAG lasers can deliver an output power of over 30 W at 946 nm under cryogenic cooling, corresponding to a slope efficiency of up to 78% [41], which provides an efficient method for scaling the power of a 937 nm Nd:GYSGG laser.…”

Section: Nd:gysgg Laser Operating In the 09-095 μM Rangementioning

confidence: 99%

Laser Performance of Neodymium- and Erbium-Doped GYSGG Crystals

Zhong

2019

Crystals

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Garnet crystals possess many properties that are desirable in laser host materials, e.g., they are suitable for diode laser (LD) pumping, stable, hard, optically isotropic, and have good thermal conductivity, permitting laser operation at high average power levels. Recently, a new garnet material, GYSGG, was developed by replacing some of the yttrium ions (Y3+) with gadolinium ions (Gd3+) in YSGG, demonstrating great potential as a laser host material. GYSGG crystals doped with trivalent neodymium ion (Nd3+) and erbium ions (Er3+) were successfully grown for laser generation in the near- and mid-infrared range, with some of the laser performances reaching the level of mature laser gain media. This paper gives an overview of the achievements made in Nd3+- and Er3+-doped GYSGG lasers at different wavelength ranges. Additionally, full descriptions on Q-switching, mode-locking and wavelength-selecting methods for Nd:GYSGG, and the mechanisms of power scaling by co-doping sensitizers and deactivators in Er:GYSGG, are given. It is expected that this review will help researchers from related areas to quickly gain an understanding of these laser materials and promotes their commercialization and applications.

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High power cryogenic Ho:YAG laser

Cited by 21 publications

References 21 publications

Moving towards high-power thin-disk lasers in the 2 µm wavelength range

Moving towards high-power thin-disk lasers in the 2 µm wavelength range

A Cryogenic Silicon Interferometer for Gravitational-wave Detection

Laser Performance of Neodymium- and Erbium-Doped GYSGG Crystals

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