Stimulated-emission spectroscopy of fine-grained “garnet” ceramics Nd3+:Y3Al5O12in a wide temperature range between 77 and 650 K

Каминский, А. А.; Багаев, С. Н.; Ueda, Ken–ichi; Shirakawa, Akira; Tokurakawa, T.; Yagi, Hideki; Yanagitany, T.; Dong, Jun

doi:10.1002/lapl.200910055

Cited by 18 publications

(8 citation statements)

References 19 publications

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“…The emission 4 F 3/2 → 4 I 11/2 spectrum at room temperature (figure 2) is dominated by the 1061.4 nm line, usually attributed to the R 2 → Y 3 transition. However, similar to Nd:YAG [25], the almost resonant transition R 1 → Y 2 could participate in this emission, the relative contributions being influenced by their emission cross-sections and by the opposite variation with temperature of the fractions f (R 1 ) and f (R 2 ).…”

Section: Spectroscopic Bases For Selection Of Pump Wavelength and Nd ...mentioning

confidence: 99%

Improved laser efficiency by direct diode laser pumping of the radiation-resistant Nd:gadolinium–scandium–gallium garnet

Lupeǐ¹,

Pavel²,

Lupeǐ³

2014

Laser Phys.

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Spectroscopic investigation of the radiation-resistant Nd:GSGG crystals and ceramics reported in this paper evidences that the absorption line at 883 nm corresponding to the unusual situation of quasi-degenerate absorption transitions 4 I 9/2 (2) → 4 F 3/2 (1) and 4 I 9/2 (3) → 4 F 3/2 (2) can be used for efficient direct diode laser pumping of this material, with stable absorption over an extended temperature range. It is inferred that the reduction of the quantum defect at this wavelength of pump compared to the traditional 807 nm pumping could improve the laser parameters and reduce drastically the heat generation, leading to a considerable extension of the power scalability. This possibility is demonstrated for the first time in the case of the 1061 nm laser emission in a continuous-wave and in the repetitive active acousto-optic and passive Q-switched laser emission. In all regimes this manifests in the reduction of the laser threshold, increase of slope efficiency and extension of the average power range. Additionally, in the active Q-switching this enables increased pulse energy and reduced pulse duration. The direct pumping could revitalize the utilization of Nd:GSGG for construction of lasers with storage of population inversion or working in an ionizing radiation environment.

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Section: Spectroscopic Bases For Selection Of Pump Wavelength and Nd ...mentioning

confidence: 99%

Improved laser efficiency by direct diode laser pumping of the radiation-resistant Nd:gadolinium–scandium–gallium garnet

Lupeǐ¹,

Pavel²,

Lupeǐ³

2014

Laser Phys.

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“…It was also found that the relative intensity of the two wavelengths of 1061 and 1064 nm depends on the operation temperature and the pump power intensity. Actually, the balance between the rates of spontaneous emissions at 1061 and 1064 nm has earlier been observed in Nd:YAG crystals and ceramics at cryogenic temperatures [19]. Nevertheless, the performance of dual-wavelength Nd:YAG lasers at 1061 and 1064 nm has so far not been explored.…”

Section: Introductionmentioning

confidence: 99%

A cryogenically cooled Nd:YAG monolithic laser for efficient dual-wavelength operation at 1061 and 1064 nm

Cho¹,

Tuan²,

Yu³

et al. 2013

Laser Phys. Lett.

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We experimentally explore the fluorescence spectra of the Nd:YAG (YAG: yttrium aluminum garnet) crystal at cryogenic temperatures to confirm the feasibility of dual-wavelength operation at 1061 and 1064 nm. Furthermore, a cryogenically cooled Nd:YAG crystal with coating to form a monolithic cavity is employed to investigate the performance of the dual-wavelength operation. At an incident pump power of 20 W, the output powers for each wavelength can simultaneously reach 6.0 W at the optimally balanced temperature of 152 K. The optimal temperature for balancing the output powers of the two wavelengths is experimentally determined as a function of the incident pump power intensity.

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“…The main advantage consists in the elimination of the thermal population at the lower laser level to reduce the reabsorption losses [6]. Moreover, cooling the laser crystal to cryogenic temperature can improve the thermal and thermo-optical properties to maintain the beam quality at high-power operation [10][11][12][13][14]. In past few years, the cryogenic Nd:YAG laser at 946 nm has been experimentally studied by several groups [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the optimal temperature for the cryogenic monolithic Nd:YAG laser at 946-nm

Cho¹,

Huang²,

Cheng³

et al. 2016

Opt. Express

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The optimal temperature for the cryogenic monolithic Nd:YAG laser at 946-nm is theoretically and experimentally analyzed. It is clear that decreasing temperature can considerably eliminate the thermal population at the lower laser level to enhance the quantum efficiency. However, the narrowing of the absorption bandwidth for the gain medium leads to a reduction of the effective absorption efficiency as the temperature is decreased. Consequently, an optimal temperature for the maximum output power is found to be in the range of approximately 120 K to 140 K. It is experimentally verified that employing a pump source with a narrower emission spectrum linewidth contributes a more efficient output for the cryogenic laser.

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Stimulated-emission spectroscopy of fine-grained “garnet” ceramics Nd³⁺:Y₃Al₅O₁₂in a wide temperature range between 77 and 650 K

Cited by 18 publications

References 19 publications

Improved laser efficiency by direct diode laser pumping of the radiation-resistant Nd:gadolinium–scandium–gallium garnet

Improved laser efficiency by direct diode laser pumping of the radiation-resistant Nd:gadolinium–scandium–gallium garnet

A cryogenically cooled Nd:YAG monolithic laser for efficient dual-wavelength operation at 1061 and 1064 nm

Analysis of the optimal temperature for the cryogenic monolithic Nd:YAG laser at 946-nm

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