A self-seeded discharge-excited ArF excimer laser oscillator using a dual-cavity configuration with long cavity lengths was developed and characterized. Proper designs for effective mode-locking in long cavity-lengths are proposed and demonstrated experimentally, which will significantly improve the energy and monochromaticity. By using the techniques of efficient mode-locking, self-seeded laser outputs with nearly the same linewidths with the seeders and larger energies are obtained. And the mode-locking can be achieved at different laser linewidths and wavelength centers.
A coherence length tunable solid-state laser based on Fabry-Perot (F-P) etalon with high stability is constructed. Principles of the coherence length tuning method by rotating the F-P etalon are theoretically analyzed and experimentally verified. By using Nd:YAG as the gain medium, an all-solid-state 1064 nm laser with 375 mW output power, 0.37% high power stability(RMS), high beam quality, and tunable coherence lengths from 9.37 cm to 20.05 cm is achieved. This method could be extended to multiband center wavelengths for their tuning of coherence length.
The inscription method of FBGs on large-mode-area double-clad fibers (LMA-DCFs) with phase mask technique was
described. A pair of LMA FBGs was prepared and the center wavelengths of them were both around 1076nm with 3 dB
bandwidths of about 0.5nm. The reflectivities of them are 99% and 10% in the fundamental mode, respectively. In order
to be protected and to withstand high-power laser, the FBGs were metally packaged, and then applied to an Yb3+-doped
LMA-DCF laser as the laser cavity. An output power of 314 W centered at 1075.71 nm with a slope efficiency of 60%