High-efficiency and economical solar-energy-pumped laser with Fresnel lens and chromium codoped laser medium

Yabe, Takashi; Ohkubo, Takeru; Uchida, Satoshi; Yoshida, Kunio; Nakatsuka, Masahiro; Funatsu, Takayuki; Mabuti, A; Oyama, Atsushi; Nakagawa, Kōichi; Oishi, Takehiro; Daito, Kazuya; Behgol, B.; Nakayama, Yoshimichi; Yoshida, Minoru; Motokoshi, Shinji; Sato, Yuji; Baasandash, Choijil

doi:10.1063/1.2753119

Cited by 182 publications

(109 citation statements)

References 5 publications

Supporting

Mentioning

109

Contrasting

Order By: Relevance

“…Cr,Nd:YAG is one of the most investigated media [11], and the transparent YAG ceramic is mainly used in recent studies [12]. However, absorption of Cr,Nd:YAG around 500 nm which corresponds to the wavelength of solar radiation peak and the absorption cross section are relatively small even at the absorption peak wavelength.…”

Section: Introductionmentioning

confidence: 99%

Float zone growth and spectral properties of Cr,Nd:CaYAlO4 single crystals

Ueda

Higuchi

Yamada

et al. 2014

Journal of Crystal Growth

View full text Add to dashboard Cite

Cr,Nd:CaYAlO 4 single crystals were grown by the floating zone method and their spectroscopic properties were investigated. Many voids were observed in the crystals grown with a stoichiometric feed rod even at a relatively low growth rate of 2.5 mm/h, while a void-free crystal was grown at the same growth rate using a feed rod the composition of which was Y-rich to Ca. These results indicate that voids were attributable to constitutional supercooling due to the segregation of main constituents caused by the difference in congruent and stoichiometric compositions. The as-grown crystals were deep red and showed strong absorption in the wavelength region of 320-600 nm. The absorption cross section for σ-polarization at 430 nm, where

show abstract

Section: Introductionmentioning

confidence: 99%

Float zone growth and spectral properties of Cr,Nd:CaYAlO4 single crystals

Ueda

Higuchi

Yamada

et al. 2014

Journal of Crystal Growth

View full text Add to dashboard Cite

show abstract

“…6.7 W/m 2 collection efficiency has been achieved by pumping the Nd:YAG rod within the 3D-compound parabolic concentrator-2D-compound parabolic concentrator (3D-CPC-2D-CPC) cavity [6]. The recent progress in high-efficiency and economical solar-pumped laser with a Fresnel lens and a chromium codoped ceramic laser rod has largely improved the collection efficiency to 18.7 W/m 2 [8]. Researchers, including us, are now strongly motivated to build a powerful solar-pumped laser for the efficient reduction of magnesium (Mg) from magnesium oxide (MgO).…”

Section: Introductionmentioning

confidence: 99%

A Simple Approach for Enhancing the Output Performance of Solar‐Pumped Solid‐State Lasers

Liang

Pereira

2009

International Journal of Optics

View full text Add to dashboard Cite

A simple truncated fused silica elliptical cavity is proposed to enhance the output performance of solar-pumped solid-state lasers. The imaging property of the truncated elliptical cavity ensures an enhanced absorption distribution within an Nd:YAG rod. Optimum pumping parameters are found through ZEMAX nonsequential ray-tracing and LASCAD laser cavity analyses. Compared with the output laser performance of a 3D-compound parabolic concentrator-2D-compound parabolic concentrator (3D-CPC-2D-CPC) cavity, the truncated cavity provides 11% more multimode and 72.7% more TEM 00 laser powers. A laser beam of high beam quality can be produced efficiently. The standard tracking error for multimode laser power is also reduced to only 4.0% by the truncated cavity.

show abstract

“…3 Other reports on this laser material obtained by pumping lamp or solar light have been published. 4,5 Solar-pumped lasers 6,7 have also been studied. Such lasers are applicable to the generation of renewable energy because of their low cost.…”

Section: Introductionmentioning

confidence: 99%

“…Such lasers are applicable to the generation of renewable energy because of their low cost. The use of space solar power systems and magnesium cycles as energy sources 4 has been proposed. The optical properties of Nd/Cr:YAG ceramics are discussed below.…”

Section: Introductionmentioning

confidence: 99%

INCREASE IN EFFECTIVE FLUORESCENCE LIFETIME BY CROSS-RELAXATION EFFECT DEPENDING ON TEMPERATURE OF Nd/Cr:YAG CERAMIC USING WHITE-LIGHT PUMP SOURCE

Saiki

Nakatsuka

Fujioka

et al. 2013

Opt. Photonic Lett.

View full text Add to dashboard Cite

An increase in the effective fluorescence lifetime of Nd/Cr:YAG ceramics with temperature dependence was observed. The dependence on the doped Cr ion density for the increased effective fluorescence lifetime was also investigated. The effective lifetime of fluorescence in the ceramics increased from 1.1 to 1.8 ms owing to the phonon-assist cross-relaxation induced by the excited Cr ions, which is commonly observed in Tm:YAG or glass lasers. The increase in effective fluorescence lifetime can be explained by spontaneous emissions occurring from the excited Nd ions and excitations of the Nd ions from the lower level to the upper level at the same time. Additionally, an experiment for laser oscillations with the temperature of the laser material controlled was performed, and a remarkable increase of the output laser energy owing to cross-relaxation was observed when the temperature increased. The obtained maximum laser energy output was near twice that without cross-relaxation. The ceramics are considered promising lamp-or solar-pumped solid-laser materials owing to the efficient laser action based on this cross-relaxation.

show abstract

High-efficiency and economical solar-energy-pumped laser with Fresnel lens and chromium codoped laser medium

Cited by 182 publications

References 5 publications

Float zone growth and spectral properties of Cr,Nd:CaYAlO4 single crystals

Float zone growth and spectral properties of Cr,Nd:CaYAlO4 single crystals

A Simple Approach for Enhancing the Output Performance of Solar‐Pumped Solid‐State Lasers

INCREASE IN EFFECTIVE FLUORESCENCE LIFETIME BY CROSS-RELAXATION EFFECT DEPENDING ON TEMPERATURE OF Nd/Cr:YAG CERAMIC USING WHITE-LIGHT PUMP SOURCE

Contact Info

Product

Resources

About