High-power table-top white-light few-cycle laser generator

Abstract

Abstract.We have achieved experimentally a generation of white-light few-cycle femtosecond laser pulses, using a neon-filled hollow-core fibre. The pulses observed by us are as short as 6.22 fs at the repetition rate of 1 kHz, when the input is characterized by the parameters 2.5 mJ and 33 fs. Pulse compression has been achieved using a supercontinuum produced in a static neon-filled hollow fibre, while a pair of chirped mirrors have compensated the dispersion. Our technique allows for directly tuning the pulse duration via changing the gas pressure, while maintaining near-transform-limited pulses with constant output energies and thus reducing the complications introduced by the chirped pulses. Using the measurements of the optical transmission of the fibre as a function of the gas pressure, we have testified a high enough throughput exceeding 60%. This demonstrates the successful compression that yields few-cycle femtosecond-long pulses, with a wide spectral bandwidth. The technique can be used when simultaneously exciting different states in complex molecules.

High-Power, High-Purity HG0n Hermite–Gaussian Laser Beam Generation in Cascaded Large Aspect Ratio Slabs

“…Meanwhile, by replacing the AO Q-switch with a saturable absorber, the mode-locking can be obtained, and the pulse width can be reduced to several hundred picoseconds. Although previous studies have shown that ultrafast high-power HG mn laser beams are affected by other parameters like self-phase modulation and bandwidth [25,26], the relatively large dimensions of the gain medium, such as a slab with a large aspect ratio, will reduce the effect. Further conversion to vortex LG pl modes can be achieved by using AMC composed of cylindrical lenses, which will be widely used in optical communication, material processing, and many other fields [27][28][29].…”