We report on the development of an all-fiber, 793-nm cladding-pumped tunable Tm-doped fiber laser based on a voltage driven 2-μm, intra-cavity, fiber-coupled, Fabry-Perot tunable filter. Continuous tuning over a 90-nm range has been achieved from 1952 to 2042 nm with a spectral linewidth ≤0.07 nm and an optical signal-to-noise ratio <55 dB. A wavelength stability of ±0.01 nm over a run time of 2 hours has been demonstrated. The desired wavelength from the available 90 nm of tuning range can be selected by the filter with a kHz repetition rate.
We report on the development of an all-fiber, 68-kW-peak-power, 16-ps-pulse-width, narrow-bandwidth, linearly polarized, 1064-nm fiber laser suitable for high-power, picosecond-pulse-width, green-light generation. Our 1064-nm fiber laser delivered an average power of up to 110 W at a repetition of 100- MHz in a narrow bandwidth, with minimal nonlinear distortion. We developed a high-power, picosecond green source at 532 nm through use of single-pass frequency-doubling of our 1064-nm fiber laser in lithium triborate (LBO). Using a 15-mm long LBO crystal, we have generated 30 W of average power in the second harmonic with 73-W of fundamental average power, for a conversion efficiency of 41%.