We present an integrated repetition rate tunable Yb-fiber laser system delivering microjoule pulses with compressed pulse duration below 350 fs. The system uses a chirped fiber Bragg grating as fiber stretcher, which is specially designed to match the second and third order dispersion of transmission grating pair compressor with a groove density of 1740 l/mm. 1 μJ pulse in 266 fs and 10 μJ pulse in 325 fs pulse duration are obtained at rep-rate of 2 MHz and 200 kHz, respectively. The pulse rep-rate can be tuned from 200 kHz to 2 MHz while maintaining ⪅350 fs microjoule pulses output. This rep-rate tunable, μJ-level fiber laser source is built for applications in ophthalmology, such as cornea flap cutting and tissue vaporization.
In this work, we experimentally demonstrated a high-power ultrafast fiber laser system, constructed in a monolithic fiber configuration. The chirped pulse was boosted in power through a single large-mode-area (LMA) fiber power amplifier. A maximum average power of 1593 W was generated at the central wavelength of 1050 nm. Thanks to the help of a fiber bandpass filter placed ahead, the Stimulated Raman Scattering (SRS) spectra excited at 1100 nm were under good suppression, which exhibited more than 40 dB lower in power. Grating pair compressor were used to de-chirped pulse, and 450-fs pulse width was obtained at the output power of 154 W. We are continuing to work on pulse compression at full power.
We report the use of an optoacoustically mode-locked fiber laser to create hundreds of temporal trapping potentials in parallel, within each of which multiple optical solitons can be isolated and manipulated to interact using a variety of control methods. Using these parallel “reactors”, we achieved on-demand synthesis and dissociation of soliton molecules both globally and individually and unfolded a novel panorama of stochastic soliton dynamics. Moreover, statistical analysis based on the massive dynamic events has revealed matter-light analogy on a collective level, suggesting that the soliton molecule dynamics follow classical theory of chemical kinetics.
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