Femtosecond 8.5 mu m source based on intrapulse difference-frequency generation of 2.1 mu m pulses

0494107 - FZÚ 2019 RIV US eng J - Článek v odborném periodiku
Novák, Ondřej - Krogen, P.R. - Kroh, T. - Mocek, Tomáš - Kärtner, F.X. - Hong, K.-H.
Femtosecond 8.5 mu m source based on intrapulse difference-frequency generation of 2.1 mu m pulses.
Optics Letters. Roč. 43, č. 6 (2018), s. 1335-1338. ISSN 0146-9592. E-ISSN 1539-4794
Grant CEP: GA MŠMT LO1602; GA ČR GA16-12960S; GA MŠMT EF15_006/0000674
GRANT EU: European Commission(XE) 739573 - HiLASE CoE
Grant ostatní: OP VVV - HiLASE-CoE(XE) CZ.02.1.01/0.0/0.0/15_006/0000674
Institucionální podpora: RVO:68378271
Klíčová slova: Infrared and far-infrared lasers * nonlinear optics * parametric processes * ultrafasrt nonlinear iptics * femtosecomd phenomena * ultafast lasers
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 3.866, rok: 2018

We report on a femtosecond ∼8.5  μm, ∼2  μJ source based on the intrapulse difference-frequency generation (DFG) of 2.1 μm pulses in an AgGaSe2 (AGSe) crystal.Compared to the conventional ∼0.8 or 1 μm near-infrared (IR) pulses,a ∼2  μm driver for intrapulse DFG can provide more efficient conversion into the wavelengths longer than 5 μm due to a lower quantum defect and is more suitable for the non-oxide nonlinear crystals that have a relatively low bandgap energy. Using 26 fs, 2.1 μm pulses for type-II intrapulse DFG,we have generated intrinsically carrier-envelope phase-stable idler pulses with a conversion efficiency of 0.8%,which covers the wavelength range of 7–11 μm.Our simulation study shows that the blueshift of intrapulse DFG is assisted by self-phase modulation of the driving pulses in AGSe.The idler pulses are particularly useful for strong-field experiments in nanostructures,as well as for seeding parametric amplifiers in the long-wavelength IR.

Trvalý link: http://hdl.handle.net/11104/0287352