Abstract

Broadband $\sim 2\mathrm{\mu m}$ amplified spontaneous emissions with a full width at half-maximum (FWHM) varying from $\sim 206$ to $\sim 234\mathrm{nm}$ 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 $\sim 118\mathrm{ps}$, and the repetition rate is $\sim 9.5\mathrm{MHz}$. Limited by the bandwidth of the fiber grating used in the laser cavity, the mode-locking spectrum has a relatively narrow FWHM of $\sim 0.09\mathrm{nm}$. 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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