Nd-doped phosphate glass cane laser: from materials fabrication to power scaling tests

Ceci-Ginistrelli, Edoardo; Smith, Callum; Pugliese, Diego; Lousteau, Joris; Boetti, Nadia Giovanna; Clarkson, W.A.; Poletti, Francesco; Milanese, Daniel

doi:10.1016/j.jallcom.2017.06.159

Cited by 27 publications

(10 citation statements)

References 28 publications

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“…A 60 mm length of cane, with a core diameter of 270 µm and a cladding diameter of 800 µm, was able to emit 2 W of output power at 1054 nm with slope efficiencies of 30% and 40% with respect to the launched and absorbed pump powers, respectively. Caird's analysis revealed that a slope efficiency of 55% over the absorbed power could be achieved in optimal conditions, matching the highest results obtained so far [27]. Although the latter configuration did not operate in single-mode regime, similar cane configuration can be employed as a booster amplifier in a MOPA configuration to reach high power while preserving high beam quality [49].…”

Section: Nd-doped Phosphate Fiber Lasers and Amplifierssupporting

confidence: 63%

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

et al. 2017

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Abstract:In recent years, the exploitation of compact laser sources and amplifiers in fiber form has found extensive applications in industrial and scientific fields. The fiber format offers compactness, high beam quality through single-mode regime and excellent heat dissipation, thus leading to high laser reliability and long-term stability. The realization of devices based on this technology requires an active medium with high optical gain over a short length to increase efficiency while mitigating nonlinear optical effects. Multicomponent phosphate glasses meet these requirements thanks to the high solubility of rare-earth ions in their glass matrix, alongside with high emission cross-sections, chemical stability and high optical damage threshold. In this paper, we review recent advances in the field thanks to the combination of highly-doped phosphate glasses and innovative fiber drawing techniques. We also present the main performance achievements and outlook both in continuous wave (CW) and pulsed mode regimes.Keywords: fiber laser and amplifier; phosphate fiber; all-fiber master oscillator power amplifier (MOPA); rare-earth-doped fiber

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Section: Nd-doped Phosphate Fiber Lasers and Amplifierssupporting

confidence: 63%

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

et al. 2017

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“…Furthermore, according to the relationship between the ultimate short pulse duration (τ) and pulse bandwidth (Δν), Δν × τ = 0.441, the fwhm of 25.0 nm can theoretically support the generation of a 65.5 fs mode-locked pulse. Hence, the Nd:GSP crystal could be utilized to generate a sub-100-fs pulse in mode-locked operation …”

Section: Resultsmentioning

confidence: 99%

“…Hence, the Nd:GSP crystal could be utilized to generate a sub-100-fs pulse in mode-locked operation. 59 The fluorescence lifetime decay curve of the Nd:GSP crystal for the 4 F 3/2 multiplet transition is shown in Figure 9. The fluorescence lifetime was 321 μs using a single-exponential function.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Growth, Optical, and Spectroscopic Properties of Pure and Nd³⁺-Doped GdSr₃(PO₄)₃ Crystals with Disordered Structure

Bai

et al. 2021

Inorg. Chem.

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Disordered crystals have attracted immense attention for the generation of ultrashort laser pulses due to their good thermomechanical characteristics and wide emission bandwidths. In this work, a Gd-based orthophosphate crystal, GdSr3(PO4)3, (GSP), and a Nd3+-doped GdSr3(PO4)3 crystal, (Nd:GSP), were obtained by the Czochralski method. The crystal structure, optical properties, electronic band structure, laser damage threshold, and hardness of the GSP crystal were comprehensively investigated. It exhibited a disordered structure due to the random distribution of Sr and Gd atoms in the same Wyckoff site, which caused inhomogeneous spectral broadening. Additionally, it exhibited a short UV absorption cutoff edge (<200 nm), a large band gap (5.81 eV), and a high laser damage threshold (∼1850 MW/cm2). The spectral properties and Judd–Ofelt calculations of the Nd:GSP crystals were analyzed. A wide absorption band at 803 nm, with a full width at half-maximum value of 20 nm, makes the Nd:GSP crystal suitable for the efficient pumping of AlGaAs laser diodes. Sub-100-fs pulses could be supported by its 25 nm emission bandwidth. Hence, the GSP crystal could be a promising disordered crystal laser matrix.

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“…24,38 The glasses should also exhibit similar thermal properties (viscosity/temperature response) as well as minimum mismatch in their coefficient of thermal expansion (CTE), 39,40 as large CTE mismatch can lead to the fracture of the preform and/or the fiber. At first, the glasses should be mechanically resistant upon casting and also stable against crystallization, that is, the difference between their onset of crystallization temperature, T x , and their glass transition temperature, T g , has to be as large as possible.…”

Section: Resultsmentioning

confidence: 99%

“…A difference between these values larger than 100°C would indicate that no crystallization is expected to occur during the fiber drawing, thus increasing the probability of drawing a fiber with good optical quality including minimal scattering losses from microcrystallites. 24,38 The glasses should also exhibit similar thermal properties (viscosity/temperature response) as well as minimum mismatch in their coefficient of thermal expansion (CTE), 39,40 as large CTE mismatch can lead to the fracture of the preform and/or the fiber. Finally, for the light to be guided within the core, the refractive index of the core glass needs to be larger than that of the cladding glass.…”

Section: Resultsmentioning

confidence: 99%

Design, processing, and characterization of an optical core‐bioactive clad phosphate fiber for biomedical applications

et al. 2019

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The aim of this study was to fabricate a bioactive optical fiber able to monitor “in situ” its reaction with the body through changes in its optical properties. Core and cladding preforms were prepared with the composition (97.25*(0.50P2O5‐0.40SrO‐0.10Na2O)‐2.5ZnO‐0.25Er2O3) and (98.25*(0.50P2O5‐0.40SrO‐0.10Na2O)‐1.75ZnO) (in mol%), respectively, and successfully drawn into a multimode core/clad optical fiber. Optical and near‐Infrared images assessed the proper light guiding properties of the fiber. The fibers favor the precipitation of a Ca‐P reactive layer at its surface concomitant with a reduction in the fiber diameter, when immersed in SBF, often assigned as a sign of bioactivity. It is clearly shown here that the bio‐response of the fiber upon immersion in SBF can be tracked from the decrease in the intensity of the Er3+ ions emission at 1.5 µm. This confirms that the newly developed optical fiber, which combines good optical properties with a suitable bioactive behavior, is a promising platform for the development of novel biomedical devices for biophotonic and photomedical applications. Finally, the successful splicing of the newly developed fiber with commercial optical fibers was an evidence of the possibility to integrate the newly developed phosphate fiber within existing components used in the field of biomedicine.

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Nd-doped phosphate glass cane laser: from materials fabrication to power scaling tests

Cited by 27 publications

References 28 publications

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

Growth, Optical, and Spectroscopic Properties of Pure and Nd³⁺-Doped GdSr₃(PO₄)₃ Crystals with Disordered Structure

Design, processing, and characterization of an optical core‐bioactive clad phosphate fiber for biomedical applications

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Nd-doped phosphate glass cane laser: from materials fabrication to power scaling tests

Cited by 27 publications

References 28 publications

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

Highly Doped Phosphate Glass Fibers for Compact Lasers and Amplifiers: A Review

Growth, Optical, and Spectroscopic Properties of Pure and Nd3+-Doped GdSr3(PO4)3 Crystals with Disordered Structure

Design, processing, and characterization of an optical core‐bioactive clad phosphate fiber for biomedical applications

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Growth, Optical, and Spectroscopic Properties of Pure and Nd³⁺-Doped GdSr₃(PO₄)₃ Crystals with Disordered Structure