Solar-pumped 80 W laser irradiated by a Fresnel lens.
A solar-pumped 100 W class laser that features high efficiency and low cost owing to the use of a Fresnel lens and a chromium codoped neodymium YAG ceramic laser medium was developed. A laser output of about 80 W was achieved with combination of a 4 m(2) Fresnel lens and a pumping cavity as a secondary power concentrator. This output corresponds to 4.3% of conversion efficiency from solar power into laser, and the maximum output from a unit area of Fresnel lens was 20 W/m(2), which is 2.8 times larger than previous results with mirror-type concentrator.
Ohkubo
Tomomasa
T
Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, Tokyo, Japan. tohkubo@mech.titech.ac.jp
Yabe
Takashi
T
Yoshida
Kunio
K
Uchida
Shigeaki
S
Funatsu
Takayuki
T
Bagheri
Behgol
B
Oishi
Takehiro
T
Daito
Kazuya
K
Ishioka
Manabu
M
Nakayama
Yuichirou
Y
Yasunaga
Norihito
N
Kido
Kouichirou
K
Sato
Yuji
Y
Baasandash
Choijil
C
Kato
Kiyoshi
K
Yanagitani
Takagimi
T
Okamoto
Yoshiaki
Y