Design and Fabrication of Reflection-type Pump LD Protection Filters for High Power Fiber Lasers by Using Ta2O5/SiO2 Thin Films

Title
Design and Fabrication of Reflection-type Pump LD Protection Filters for High Power Fiber Lasers by Using Ta2O5/SiO2 Thin Films
Authors
성하민김재헌이석전영민
Keywords
고출력 광섬유 레이저; 펌프 LD 보호기; 필터; Thin films; Dichroic Filter; Fiber Lasers
Issue Date
2012-06
Publisher
한국광학회지
Citation
VOL 23, NO 3, 124-127
Abstract
We designed and fabricated dichroic filters for high-power fiber lasers to protect the pumping laser diode from counterpropagating laser beams. The transmittance at laser diode wavelengths of 905 nm ~ 925 nm was designed to be less than 0.1% and the transmittance at the fiber laser or Brillouin scattering wavelengths of 1020 nm ~ 1100 nm was designed to be more than 99.9%. Since oxide materials have good adhesion to the SiO2 substrate, SiO2/Ta2O5 were used as coating materials. The filter was fabricated according to our optimized design and its characteristics were compared with the theoretical design. As a result, the transmittance at laser diode wavelengths of 905 nm ~ 925 nm was measured to be less than 0.1%, and the transmittance at the fiber laser or Brillouin scattering wavelengths of 1020 nm ~ 1100 nm was measured to be more than 95.5%, which coincided well with the theoretical design considering processing errors. The filter was found to operate well over 1W of input laser power.
URI
http://pubs.kist.re.kr/handle/201004/43061
ISSN
12256285
Appears in Collections:
KIST Publication > Article
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