Ho:YAG single crystal fiber: fabrication and optical characterization

Li, Yuan; Johnson, Eric; Nie, Craig D.; Harrington, James A.; Shori, Ramesh K.

doi:10.1364/oe.22.014896

Cited by 18 publications

(4 citation statements)

References 22 publications

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“…The calculated limiting slope efficiency is considerably less than the quantum efficiency of ∼91%, which is caused by the following two reasons: first, the noncollinear pumping configuration, i.e., about 2 • between the pump and laser beams at the front facet of the SCF used to avoid the unwanted feedback to the Tm-fiber pump laser, and second, the energy-transfer upconversion of Ho 3+ ions in the 5 I 7 manifold under pump bleaching [20] . The propagation loss is larger than the previously reported value of 0.02 cm −1 , 'directly measured' in a 400 µm-diameter Ho:YAG SCF fabricated by LHPG method [21] . Anti-reflection coating on the SCF and optimizing the crystal quality would decrease the overall losses, thus contributing to further scaling of the laser power.…”

Section: Resultscontrasting

confidence: 68%

35 W continuous-wave Ho:YAG single-crystal fiber laser

Zhao

Wang

Chen

et al. 2020

High Pow Laser Sci Eng

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We report on a high-power Ho:YAG single-crystal fiber (SCF) laser inband pumped by a high-brightness Tm-fiber laser at 1908 nm. The Ho:YAG SCF grown by the micro-pulling-down technique exhibits a propagation loss of $0.05\pm 0.005~\text{cm}^{-1}$ at $2.09~\unicode[STIX]{x03BC}\text{m}$ . A continuous-wave output power of 35.2 W is achieved with a slope efficiency of 42.7%, which is to the best of our knowledge the highest power ever reported from an SCF-based laser in the 2 $\unicode[STIX]{x03BC}\text{m}$ spectral range.

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Section: Resultscontrasting

confidence: 68%

35 W continuous-wave Ho:YAG single-crystal fiber laser

Zhao

Wang

Chen

et al. 2020

High Pow Laser Sci Eng

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“…Therefore, Ho: YAG single crystal fiber lasers have gradually become a research hotspot. Researchers from Clemson University prepared a 0.5% Ho: YAG single crystal fiber by the LHPG method with a diameter of 320 μm and a length of 28 cm [63]. The loss for the as-grown crystal fiber was measured to be 0.88 dB/m at 1.06 μm and approximately 1.3 dB/m at 2.0 µm, indicating good crystal quality.…”

Section: Single Crystal Fiber Lasersmentioning

confidence: 99%

Single Crystal Fibers: Diversified Functional Crystal Material

Wang

Zhang

et al. 2019

Adv. Fiber Mater.

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Single crystal fibers (SCF) are considered to be a combination of bulk crystals and conventional fibers, thereby possessing the stable physical and chemical properties accompanied with excellent waveguide properties. This paper gives a detailed introduction to the development history of single crystal fibers, including the evolution of the growth technique and the optimization of the growth process. Laser-heated pedestal growth (LHPG) and Micro-pulling-down (μ-PD) methods are considered to be the most widely used growth techniques for growing single crystal fibers, and the advantages of the two methods are also introduced in detail. The second part of this paper describes the characterization of single crystal fibers, including diameter fluctuation, crystal quality and optical losses. A series of cladding approaches for SCF, such as magnetron sputtering, sol-gel, liquid phase epitaxy, co-drawing LHPG, ion implantation and micro-structure cladding will be reviewed. In addition, the research status of single crystal fiber laser and single crystal fiber sensor are also summarized in view of the current research foundation.

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“…Fortunately, the single-crystal fiber, a long and thin crystalline rod with a length of a few centimeters and a diameter less than 1 mm, is an ideal gain medium to solve this problem [20][21][22]. Such a unique structure can offer multiple total internal reflections bounces for the pump light [23] and give a relatively higher gain than free-space propagation in the SCF laser [24]. In addition, the single crystal fiber (SCF) offers efficient heat dissipation due to its small diameter and large surface-to-volume ratio [25].…”

Section: Introductionmentioning

confidence: 99%

High-efficiency Ho:YAG single-crystal fiber laser in-band pumped by a 1.9 μm laser diode

Wang¹,

Dong²,

Liu³

et al. 2023

Laser Phys. Lett.

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We report on a 10-watt-level, efficient 2 μm Ho:YAG (0.6 at.% Ho3+ doped Y3Al5O12) single crystal fiber (SCF) laser in-band pumped by a 1.9 μm laser diode. Benefiting from the high gain of the SCF and the unique propagation features of the pump and laser beams, a maximum output power of 10.77 W is achieved with T OC = 20%, corresponding to a slope efficiency of 61.8%. The higher efficiency of 64.8% and the output power of 9.8 W are obtained with T OC = 50%. Compared to the traditional bulk crystal, wave-guiding of the pump light in the SCF can extend the gain region and thus improve the laser efficiency, which provides a simple and effective method to improve the utilization rate of the pump light even for the low-brightness laser diodes.

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Ho:YAG single crystal fiber: fabrication and optical characterization

Cited by 18 publications

References 22 publications

35 W continuous-wave Ho:YAG single-crystal fiber laser

35 W continuous-wave Ho:YAG single-crystal fiber laser

Single Crystal Fibers: Diversified Functional Crystal Material

High-efficiency Ho:YAG single-crystal fiber laser in-band pumped by a 1.9 μm laser diode

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