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Studies on reducing the thermal loads of solar-pumped solid state lasers; Taiyoko reiki laser no netsufuka teigen ni kansuru kenkyu

Abstract

It was intended to reduce the thermal loads of solar-pumped solid state lasers (highly densified solar light is irradiated directly onto a laser medium to cause excitation. No electric power is required for the excitation.). For this purpose, experiments were performed by using a selective permeation film. Solar light includes wavelengths not effective for excitation, which causes heat generation and thermal loads such as lens heating effect and thermal stress compounded refraction, degrading the laser beam quality. The Nd:YAG was used as a laser medium, and a multi-layered film (composed of SiO2 and TiO2) which cuts wavelength below 500 nm as a selective permeation film to cut light having wavelengths not required for excitation. A laser transmitting experiment revealed that the slope efficiency is improved by 27% as compared to not using the film. Beam fluctuation was improved to 45%. Using the selective permeation film has realized more efficient conversion of the solar light into a beam with better quality. The results for calculation of heat lens effect by using temperature distribution simulation showed good agreement with experimental values. Using the selective permeation film can suppress the maximum temperature of a laser rod to 68%, as well as the thermal  More>>
Authors:
Shimizu, K; Yugami, H; Naito, H; Arashi, H [1] 
  1. Tohoku University, Sendai (Japan)
Publication Date:
Nov 25, 1997
Product Type:
Conference
Report Number:
ETDE/JP-98753622; CONF-9711143-
Reference Number:
SCA: 426002; 140502; PA: JP-98:0G1097; EDB-98:075493; SN: 98001948787
Resource Relation:
Conference: 1997 JSES/JWEA joint conference, Taiyo/furyoku energy koen, Aichi (Japan), 28-29 Nov 1997; Other Information: PBD: 25 Nov 1997; Related Information: Is Part Of Proceedings of JSES/JWEA Joint Conference (1997); PB: 454 p.; Taiyo/Furyoku energy koen ronbunshu (1997)
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; 14 SOLAR ENERGY; LASERS; EXCITATION; TEMPERATURE DEPENDENCE; SOLAR RADIATION; SOLAR ABSORBERS; SPECTRALLY SELECTIVE SURFACES; WAVELENGTHS; BIREFRINGENCE; NEODYMIUM LASERS; ALUMINIUM OXIDES; FERRITE GARNETS; YTTRIUM COMPOUNDS; QUALITY CONTROL; THERMAL STRESSES
OSTI ID:
625361
Research Organizations:
Japan Solar Energy Society, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE98753622; TRN: JN98G1097
Availability:
Available from Japan Solar Energy Society, 44-14, Yoyogi 2-chome, Shibuya-ku, Tokyo,(Japan); OSTI as DE98753622
Submitting Site:
NEDO
Size:
pp. 325-328
Announcement Date:

Citation Formats

Shimizu, K, Yugami, H, Naito, H, and Arashi, H. Studies on reducing the thermal loads of solar-pumped solid state lasers; Taiyoko reiki laser no netsufuka teigen ni kansuru kenkyu. Japan: N. p., 1997. Web.
Shimizu, K, Yugami, H, Naito, H, & Arashi, H. Studies on reducing the thermal loads of solar-pumped solid state lasers; Taiyoko reiki laser no netsufuka teigen ni kansuru kenkyu. Japan.
Shimizu, K, Yugami, H, Naito, H, and Arashi, H. 1997. "Studies on reducing the thermal loads of solar-pumped solid state lasers; Taiyoko reiki laser no netsufuka teigen ni kansuru kenkyu." Japan.
@misc{etde_625361,
title = {Studies on reducing the thermal loads of solar-pumped solid state lasers; Taiyoko reiki laser no netsufuka teigen ni kansuru kenkyu}
author = {Shimizu, K, Yugami, H, Naito, H, and Arashi, H}
abstractNote = {It was intended to reduce the thermal loads of solar-pumped solid state lasers (highly densified solar light is irradiated directly onto a laser medium to cause excitation. No electric power is required for the excitation.). For this purpose, experiments were performed by using a selective permeation film. Solar light includes wavelengths not effective for excitation, which causes heat generation and thermal loads such as lens heating effect and thermal stress compounded refraction, degrading the laser beam quality. The Nd:YAG was used as a laser medium, and a multi-layered film (composed of SiO2 and TiO2) which cuts wavelength below 500 nm as a selective permeation film to cut light having wavelengths not required for excitation. A laser transmitting experiment revealed that the slope efficiency is improved by 27% as compared to not using the film. Beam fluctuation was improved to 45%. Using the selective permeation film has realized more efficient conversion of the solar light into a beam with better quality. The results for calculation of heat lens effect by using temperature distribution simulation showed good agreement with experimental values. Using the selective permeation film can suppress the maximum temperature of a laser rod to 68%, as well as the thermal stress. 9 figs., 2 tabs.}
place = {Japan}
year = {1997}
month = {Nov}
}