Abstract
We present a design for a high-energy single stage mid-IR difference frequency generation adapted to a two-color Ti:sapphire amplifier system. The optimized mixing process is based on chirped pulse difference frequency generation (CP-DFG), allowing for a higher conversion efficiency, larger bandwidth and reduced two photon absorption losses. The numerical start-to-end simulations include stretching, chirped pulse difference frequency generation and pulse compression. Realistic design parameters for commercially available non linear crystals (GaSe, AgGaS2, LiInSe2, LiGaSe2) are considered. Compared to conventional un-chirped DFG directly pumped by Ti:sapphire technology we report a threefold increase of the quantum efficiency. Our CP-DFG scheme provides up to 340 {\mu}J pulse energy directly at 7.2 {\mu}m when pumped with 3 mJ and supports a bandwidth of up to 350 nm. The resulting 240 fs mid-IR pulses are inherently phase stable.
Highlights
Intense laser pulses, tunable in the mid-infrared wavelength range (3–20 lm), are interesting for numerous applications, ranging from investigations of the fingerprint spectral region and semiconductors [1, 2] to the scaling of high-C
We present simulations for a design of a highenergy single-stage mid-IR difference frequency generation adapted to a two-color Ti:sapphire amplifier system
The optimized mixing process is based on chirped pulse difference frequency generation (CP-DFG), allowing for a higher conversion efficiency and reduced two-photon absorption losses
Summary
Tunable in the mid-infrared wavelength range (3–20 lm), are interesting for numerous applications, ranging from investigations of the fingerprint spectral region and semiconductors [1, 2] to the scaling of high-. A prominent approach for accessing this wavelength range is based on a multistage white-light seeded optical parametric amplifier (OPA) system, driven by a femtosecond Ti:sapphire laser system While such BBO-based OPA stages typically provide tunable output between 1.3 and 2.6 lm, the longer wavelength range (3–20 lm) is typically accessed by an additional difference frequency generation (DFG) stage [6,7,8]. We present a different approach based on a single-stage, high-energy difference frequency generation, using chirped phase matching [12] between two intense laser pulses with different colors from a common Ti:sapphire amplifier source (Fig. 1). We performed start-to-end simulations for chirped pulse difference frequency generation (CP-DFG) under realistic conditions, based on the above-mentioned two-color Ti:sapphire laser system. This includes chirping, nonlinear wave mixing, including two-photon absorption and subsequent pulse compression.
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