We experimentally demonstrate an all-fiber single-polarization dual-wavelength Yb-doped fiber laser passively mode-locked with a 45°-tilted fiber grating for the first time. Stable dual-wavelength operation exhibits double-rectangular spectral profile centered at 1033 and 1053 nm, respectively. The 3 dB bandwidth of each rectangular optical spectrum is estimated as 10 nm. The separation of two fundamental repetition rates is 6 kHz. By employing the 45° TFG with the polarization-dependent loss of 33 dB, output pulses with 27 dB polarization extinction ratio are implemented in the experiment. The single pulse centered at 1053 nm is researched by using a filter at the output port of the laser, and the experimental results denote that the output ps pulses are highly chirped. The formation mechanism of dual-wavelength operation is investigated.
Bibliographical note© 2015 Astro Ltd
Funding: Qualified Personnel Foundation of Taiyuan University of Technology (Grant No. tyutrc201387a), National Natural Science Foundation of China (Grant No. 61227016), the National Science and Technology Infrastructure Program of Science and Technology of Shanxi Province, China (Grant No. 2013091021).
- fiber grating
- fiber lasers