Preventing photodarkening in ytterbium-doped high power fiber lasers; correlation to the UV-transparency of the core glass

• Published in: Optics express Vol. 16; no. 2; pp. 1260 - 1268
• Main Authors: Engholm, M, Norin, L
• Format: Journal Article
• Language: English
• Published: United States 21.01.2008
• Subjects: charge-transfer; Electrical engineering, electronics and photonics; Elektroteknik, elektronik och fotonik; Equipment Design; Equipment Failure Analysis; Fiber Optic Technology - instrumentation; Glass - chemistry; Lasers; Photodarkening; TECHNOLOGY; TEKNIKVETENSKAP; Ultraviolet Rays; ytterbium; Ytterbium - chemistry

Photodarkening experiments are performed on ytterbium-doped silicate glass samples. A strong charge-transfer (CT) absorption band near 230nm in aluminosilicate glass is found to be correlated to the mechanism of induced color center formation. Excitation into the CT-absorption band generates similar...