Multiwavelength lasing in the random distributed feedback fiber laser is demonstrated by employing an all fiber Lyot filter. Stable multiwavelength generation is obtained, with each line exhibiting sub-nanometer line-widths. A flat power distribution over multiple lines is obtained, which indicates that the power between lines is redistributed in nonlinear mixing processes. The multiwavelength generation is observed both in first and second Stokes waves.
We have realized supercontinuum source based on the silica-cladding fiber with the germanate-glass-core pumped by Q-switched Er-doped fiber laser. The long-wavelength edge of the spectrum obtained is located at 2.7 μm. To our best knowledge it is the longest wavelength for the silica based fiber. Average output power as high as 0.49 W was measured. Intensity variation in the range of 1.6 -2.7 μm was much less than one decade. The fibers with different lengths were tested.
For the first time to our best knowledge we have used Ho-doped fiber amplifier to get supercontinuum in the mid-IR range using all-fiber scheme. To pump the source Q-switched Er-doped fiber was used. The observed spectrum covers the spectral range from 2000 to 2500 nm with the power variation less than two decades. Average power of 0.4 W and pulse energy of 0.1 mJ was measured.
For the first time to the best of our knowledge we have realized all-fiber tunable Ho-doped laser utilizing the compressed Bragg grating reflector. The emission wavelength was tuned from 2.1 to 2.045 µm. The maximum output power was measured as 2 W at 2.1 µm. The variation of the output power in the obtained spectral range was of 7.5%.
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