Widely and continuously tunable continuum generation from CW-pumped cascaded fibers

Guo, Chunyu, Yu, Jun, Ruan, Shuangchen, Ouyang, Deqin, Lin, Huaiqin, Liu, Weiqi, Chen, Yewang, Yan, Peiguang, Hu, Xuejuan and Hua, Ping (2015) Widely and continuously tunable continuum generation from CW-pumped cascaded fibers. IEEE Photonics Journal, 7 (4), 1-7. (doi:10.1109/JPHOT.2015.2445091).

Abstract

A tunable continuum with multiwatt output power is demonstrated for the first time through the pumping of cascaded fibers by using a continuous-wave (CW) ytterbium fiber laser. The central wavelength of the output continuum can be tuned continuously and monotonically by varying input pump power, with a wide wavelength-tunable range from 1.2 to 1.4 µm and a 3-dB bandwidth of tens of nanometers. Two configurations of the cascaded fibers both display the power-dependent wavelength tunability. The output spectral characteristics are presented, and the generation of the CW-pumped tunable continuum is tentatively attributed to the seed-dependent Raman amplification.

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