Coilable single crystal fibers of doped-YAG for high power laser applications

Maxwell, G.; Soleimani, Nazila; Ponting, Bennett; Gebremichael, Eminet

doi:10.1117/12.2018426

Cited by 8 publications

(4 citation statements)

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“…Ca 3 Ga 2 Ge 3 O 12 green state claddings extruded on both doped and undoped single-crystal YAG fibers were melted and then crystallized in a laser heated pedestal growth (LHPG) apparatus modified by AFRL from an earlier design. 18,19,20 The apparatus had a hot zone of 0.5 mm; speeds of 1.0 to 2.7 mm/min were used. Microstructures of the various cladded fibers and the crystallized YAGgarnet melts were observed with SEM (Quanta, Thermo Fischer, Hillsboro, OR) and TEM (Talos, Thermo Fischer, Hillsboro, OR) with EDX.…”

Section: Ca3ga2ge3o12 and Lica2mg2asxv3-xo12 Claddingmentioning

confidence: 99%

Claddings for YAG single crystal high power fiber lasers

Hay

Kim²,

Schlup³

et al. 2023

Solid State Lasers XXXII: Technology and Devices

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Doped single-crystal YAG fibers used as single-mode lasers require claddings with precise refractive index and high thermal conductivity. Three cladding materials that use coextrusion of green cladding on fiber cores as an initial processing step are described: 1. Undoped YAG cladding, followed by sintering or hot isostatic pressing. 2. Ca 3 Ga 2 Ge 3 O 12 garnet cladding that melts beneath 1400°C. 3. LiCa 2 Mg 2 As 3x V 3-3x O 12 garnet cladding that melts beneath 1100°C. Microstructures are characterized by TEM. Equipment and procedures are described. Garnet refractive index models are developed and validated to predict cladding refractive index. Advantages and disadvantages of the different claddings are compared.

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Section: Ca3ga2ge3o12 and Lica2mg2asxv3-xo12 Claddingmentioning

confidence: 99%

Claddings for YAG single crystal high power fiber lasers

Hay

Kim²,

Schlup³

et al. 2023

Solid State Lasers XXXII: Technology and Devices

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“…One of the most LFZ-developed materials is single crystal Y 3 Al 5 O 12 (YAG) as a laser medium. Despite the fact that it was produced by Fejer et al in 1984 [25], a considerable amount of work has appeared during the last 20 years (Table 1) reporting its growth [35][36][37][38][40][41][42][49][50][51][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72], improving the production efficiency [59,71], and also enhancing its mechanical and optical characteristics [38]. Among those studies, the work of Nie et al, in 2015 [37], who produced YAG single crystals doped with Er 3+ , Ho 3+ , Tm 3+ , Nd 3+ , and Yb 3+ may be highlighted here.…”

Section: Materials For Photonic and Optical Applicationsmentioning

confidence: 99%

“…The doubleclad structure fabrication has been generally achieved by covering the single-crystal fiber through Sol-Gel and later sintering [49] or basically inserting a diameter-reduced grown rod into silica-or glass-based capillary tubes [35,50,63,66,68]. These kinds of materials, namely, the cladded, single-crystal fibers, have been largely applied as fiber amplifiers of the laser radiation [40,67,70]. Recently, Kim et al, in 2019, produced Yb:YAG core/YAG-clad fibers by a three-step process, combining an initial growth of doped YAG fibers, followed by acid etching and, finally, an epitaxial hydrothermal growth of the undoped YAG cladding [72].…”

Section: Materials For Photonic and Optical Applicationsmentioning

confidence: 99%

Laser Floating Zone Growth: Overview, Singular Materials, Broad Applications, and Future Perspectives

et al. 2020

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The Laser Floating Zone (LFZ) technique, also known as Laser-Heated Pedestal Growth (LHPG), has been developed throughout the last several decades as a simple, fast, and crucible-free method for growing high-crystalline-quality materials, particularly when compared to the more conventional Verneuil, Bridgman–Stockbarger, and Czochralski methods. Multiple worldwide efforts have, over the years, enabled the growth of highly oriented polycrystalline and single-crystal high-melting materials. This work attempted to critically review the most representative advancements in LFZ apparatus and experimental parameters that enable the growth of high-quality polycrystalline materials and single crystals, along with the most commonly produced materials and their relevant physical properties. Emphasis will be given to materials for photonics and optics, as well as for electrical applications, particularly superconducting and thermoelectric materials, and to the growth of metastable phases. Concomitantly, an analysis was carried out on how LFZ may contribute to further understanding equilibrium vs. non-equilibrium phase selectivity, as well as its potential to achieve or contribute to future developments in the growth of crystals for emerging applications.

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“…Our solution is to develop single-crystal fibers that act like a hybrid of glass fibers and bulk crystals (see Figure 1). 2 Single fibers maintain all the advantages of bulk single crystals, such as thermal conductivity, efficiency, and mechanical resistance. Our approach is to grow single-crystal doped YAG fibers by the laser-heated pedestal growth (LHPG) method (see Figure 2).…”

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confidence: 99%