Abstract

Broadband 2μm amplified spontaneous emissions with a full width at half-maximum (FWHM) varying from 206 to 234nm were obtained from the Ho/Cr/Tm:yttrium aluminum garnet (YAG) crystal derived fibers, which were drawn using a molten core method. The core-cladding structure of the as-drawn fibers was preserved completely, and the core was found to be amorphous. What is more, an all-fiber-integrated passively mode-locked laser based on an 8 cm long Ho/Cr/Tm:YAG crystal derived all-glass fiber was built which, to the best of our knowledge, is the first demonstration of a mode-locked fiber laser in a similar YAG derived fiber. The mode-locked pulses operate at 1.95 μm with duration of 118ps, and the repetition rate is 9.5MHz. Limited by the bandwidth of the fiber grating used in the laser cavity, the mode-locking spectrum has a relatively narrow FWHM of 0.09nm. These results suggest that the broadband YAG crystal derived all-glass fibers are promising for ultrafast fiber lasers applications.

© 2019 Optical Society of America

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