Passively Q-switched erbium all-fiber lasers by use of thulium doped saturable-absorber fibers

• Main Authors: Shin-HaoHung, 洪士豪
• Other Authors: Tzong-Yow Tsai
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/90636310769732091982

碩士 === 國立成功大學 === 微電子工程研究所碩博士班 === 98 === We demonstrate all-fiber passively Q-switched erbium lasers at 1570 nm using Tm3+-doped saturable-absorber fibers. The absorption cross section of a Tm3+-doped fiber at 1570 nm was measured in a bleaching experiment to be about 1.44?10-20 cm2. With a thulium-doped fiber, sequential pulses with a pulse energy of 9??J and a pulse duration of about 420 ns were stably produced at repetition rates in the range 0.1 to 3 kHz. The corresponding deviation of the repetition-rate stability was 4 to 188Hz. The loss caused by photo-darkening was about 12% after a long time operation. The maximum pulse repetition rate was 6 kHz, limited by the maximum pump power of a 980- nm laser diode, about 230 mW.