Pulse compression by Stimulated Brillouin scattering
Methods of pulse stretching and compression are easily implemented with fs pulses using chirped mirrors, prisms and gratings. Chirped pulse amplification is used to reach PW peak powers in fs pulses. There is however a need for methods to generate and amplify pulses in the picosecond to nanosecond range. One method that we developed is to compress and amplify pulses by stimulated Brillouin scattering, leading to 170 ps pulses at 266 nm of 300 mJ [1, 2].
References
[15] Chengyong Feng, Xiaozhen Xu, and Jean-Claude Diels. Generation of 300 ps laser pulse with 1.2 J energy by stimulated Brillouin scattering in water at 532 nm. Opt. Lett., 39(12):3367-3370, (2014).
[16] Chengyong Feng, Xiaozhen Xu, and Jean-Claude Diels. High-energy sub-phonon lifetime pulse compression based on stimulated Brillouin scattering in liquids. Optics Express., 25:12421-12434, (2017).
Pulse compression, bandwidth broadening by harmonic generation
In new physics involving saturated harmonic up and down conversion, a field sometimes referred to as "nonlinear-nonlinear optics", a factor 60 compression was achieved through second harmonic generation in long crystals [1, 2]. More generally, the giant dispersion associated with the narrow phase matching bandwidth of long crystals can be exploited for large pulse bandwidth broadening and temporal compression [1]. This technique is being applied to the construction of a picosecond source at 355 nm, with adjustable chirp for the remote initiation of filaments.
References
[1] Xuan Luo, Ning Hsu, Jens Biegert, and Ladan Arissian. Pulse compression in parametric amplification. Cassandra Strickland, editor, Wiley Encyclopedia of Electrical and Electronics Engineering, in press. Wiley, 2018.
[2] J. Biegert and J. C. Diels. Compression of pulses of a few optical cycles through harmonic conversion. Journal of Optical Society B, 18:1218{1226, (2001).
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