Increase in modification strength induced by ultrafast laser writing at high scanning speed in silica glass is demonstrated. Counterintuitively, despite lower energy density, stronger modification is produced, which is beneficial for 5D optical data storage.
Using multiplexed broadband ptychography (MBP), we characterize the EUV light in high-order harmonic generation (HHG). MBP can measure spectrally resolved complex beam profiles for different harmonic outputs without spectral dispersion. Through a simple change to the experimental setup, we also characterize the driving laser for the process. The experimentally measured driving laser profile is used in an SFA+ with dipole approximation simulation of high harmonic generation. The simulated results are compared to the experimentally measured high harmonics produced with the characterized driving laser. By characterizing the input and output in HHG we can further understand the generation mechanics to better control the process. We also can investigate how control of the fundamental laser can lead to control of the output harmonics.
The development of a 20.6 W radially polarized Ho:YAG laser is reported, which has been actively Q-switched in order to generate 0.52 mJ pulses with a 210 ns full-width half-maximum duration. By utilizing a laser-written spatially-variant birefringent waveplate (S-waveplate) with ultra-low scattering losses inside the cavity, the linearly polarized beam exiting the acousto-optic modulator is transformed into radial polarization with very high conversion efficiency. The excellent radial polarization purity (49:1) and beam quality (M2 of 2.14) highlight this approach as a very suitable platform for high power operation, assisted by the large damage threshold and customizability of the S-waveplate.
We have demonstrated for the first time, to the best of our knowledge, the successful direct amplification of a cylindrical-vector beams with axially symmetric polarization and doughnut-shaped intensity profile in picosecond MOPA system based on a double-clad ytterbium-doped spun tapered fiber with a ring-shaped active core. The output radially polarized beam with absolute contrast between bright and dark zones carries 10 ps pulses at 1030 nm with a 14.5 W average power level, 91 kW peak power and 0.97 μJ pulse energy.
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