Abstract

Stimulated Brillouin scattering (SBS) is the first nonlinear effect that limits power scaling of narrow linewidth fiber lasers. Nonlinearities typically have a reduced impact when operating at longer wavelengths. However, the SBS gain is considered wavelength independent. To investigate this further, a pulsed 2053 nm source with MHz-linewidth is amplified to >100 W peak powers in single-mode, thulium-doped fiber. The SBS thresholds were measured while varying the pulse duration. Analyzing the SBS threshold measurements suggests that the peak Brillouin gain coefficient is ∼12.2 pm/W with a spontaneous Brillouin bandwidth of ∼17.5 MHz in the passive single-mode fiber at 2053 nm. While the peak Brillouin gain coefficient is comparable to those reported at shorter wavelengths, the spontaneous Brillouin bandwidth is significantly narrower. This indicates that long wavelength sources can inhibit the onset of SBS more readily than short wavelength sources.

High SBS-threshold single-mode single-frequency monolithic pulsed fiber laser in the C-band

Wei Shi, Eliot B. Petersen, Matthew Leigh, Jie Zong, Zhidong Yao, Arturo Chavez-Pirson, and Nasser Peyghambarian
Opt. Express 17(10) 8237-8245 (2009)

High SBS-threshold, narrowband, erbium co-doped with ytterbium fiber amplifier pulses frequency-doubled to 770 nm

C. E. Dilley, M. A. Stephen, and M. P. Savage-Leuchs
Opt. Express 15(22) 14389-14395 (2007)

Stimulated Brillouin scattering suppression of thulium-doped fiber amplifier with fiber superfluorescent seed source

Chen Liu, Jiang Liu, Yijing Zhang, Yubin Hou, Shuxian Qi, Xian Feng, and Pu Wang
Opt. Express 25(9) 9569-9578 (2017)

Transverse mode instability induced by stimulated Brillouin scattering in a pulsed single-frequency large-core fiber amplifier

Kyung-Hyun Lee, Kangin Lee, Yonghee Kim, Yong-Ho Cha, Gwon Lim, Hyunmin Park, Hyuck Cho, and Do-Young Jeong
Appl. Opt. 54(2) 189-194 (2015)

Single-frequency 100 ns / 0.5 mJ laser pulses from all-fiber double clad ytterbium doped tapered fiber amplifier

Kim Patokoski, Joona Rissanen, Teppo Noronen, Regina Gumenyuk, Yuri Chamorovskii, Valery Filippov, and Juha Toivonen
Opt. Express 27(22) 31532-31541 (2019)