Abstract
We report a wavelength-switchable single-polarization dissipative soliton (DS) mode-locked fiber laser using a chirped fiber Bragg grating (FBG) for spectral filtering. The chirped FBG, when inserted into the ring cavity, provides a stopband from 1045 nm to 1057 nm, which is used for spectral filtering in this all-normal-dispersion mode-locked Yb-doped fiber laser. The combination of the chirped FBG and the Yb gain profile help the formation of the DS. The laser delivers wavelength-switchable and polarized (28 dB) DS of 6.1 nJ and 29 ps at 1032 nm, and 4.3 nJ and 24 ps at 1068 nm, respectively. To the best of our knowledge, this is the direct proof that a bandpass filter is not indispensible to achieve stable DS in ps fiber lasers.
Highlights
Dissipative soliton (DS) mode-locked fiber lasers have been extensively investigated owing to their high pulse energy and linearly chirped pulse, which can be further compressed
Several fiber-based bandpass filters have been reported for realizing stable dissipative soliton (DS) mode-locked output, e.g., fused wavelength division multiplexer [2], [3], Lyot filter [4], sagnac loop filter [5], and multimode interference filter [6]
We demonstrate a wavelength switchable DS mode locking in an all-normal dispersion Yb-doped fiber laser based on nonlinear polarization evolution (NPE)
Summary
Dissipative soliton (DS) mode-locked fiber lasers have been extensively investigated owing to their high pulse energy and linearly chirped pulse, which can be further compressed. Several fiber-based bandpass filters have been reported for realizing stable DS mode-locked output, e.g., fused wavelength division multiplexer [2], [3], Lyot filter [4], sagnac loop filter [5], and multimode interference filter [6]. The important role of the filter in all-normal-dispersion mode-locked fiber laser resulted in many interesting publications, especially in different DS operations. Yue et al observed dual-wavelength DS in a mode-locked figure-eight fiber laser operating in the net-normal dispersion regime [11]. The Lyot filter with a periodic transmission spectrum in the ring cavity is easy to implement [4]. Utilizing its periodic transmission spectrum, Fedotov et al reported pulsewidth and wavelength-switchable all-fiber mode-locked Yb laser with SWCNT [13]. We demonstrate a wavelength switchable DS mode locking in an all-normal dispersion Yb-doped fiber laser based on nonlinear polarization evolution (NPE). This work provided clear evidence that a bandpass filter is not indispensible to achieve stable DS mode locking
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