Damian N. Schimpf
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View article: Highly efficient generation of narrowband terahertz radiation driven by a two-spectral-line laser in PPLN
Highly efficient generation of narrowband terahertz radiation driven by a two-spectral-line laser in PPLN Open
We demonstrate record ∼0.9% efficiencies for optical conversion to narrowband (<1% relative bandwidth) terahertz (THz) radiation by strongly cascaded difference frequency generation. These results are achieved using a novel, to the best of…
View article: Frequency-comb-based laser system producing stable optical beat pulses with picosecond durations suitable for high-precision multi-cycle terahertz-wave generation and rapid detection
Frequency-comb-based laser system producing stable optical beat pulses with picosecond durations suitable for high-precision multi-cycle terahertz-wave generation and rapid detection Open
We generate temporally modulated optical pulses with a beat frequency of 255 GHz, a duration of 360 ps, and a repetition rate of 2 MHz. The temporal envelope, beat frequency, and repetition rate are computer-programmable. A frequency comb …
View article: Cascaded interactions mediated by terahertz radiation
Cascaded interactions mediated by terahertz radiation Open
We investigate a regime of parametric amplification in which the pump and signal waves are spectrally separated by only a few hundreds of GHz frequency - therefore resulting in a sub-THz frequency idler wave. Operating in this regime we fi…
View article: 87-W 1018-nm Yb-fiber ultrafast seeding source for cryogenic Yb: yttrium lithium fluoride amplifier
87-W 1018-nm Yb-fiber ultrafast seeding source for cryogenic Yb: yttrium lithium fluoride amplifier Open
We demonstrate a compact and robust Yb-fiber master-oscillator power-amplifier system operating at 1018 nm with 2.5-nm bandwidth and 1-ns stretched pulse duration. It produces 87-W average power and 4.9-μJ pulse energy, constituting a powe…
View article: Pre-chirp managed, core-pumped nonlinear PM fiber amplifier delivering sub-100-fs and high energy (10 nJ) pulses with low noise
Pre-chirp managed, core-pumped nonlinear PM fiber amplifier delivering sub-100-fs and high energy (10 nJ) pulses with low noise Open
We demonstrate a pre-chirp managed amplification (PCMA) system that is based on two stages of core-pumped, polarization maintaining (PM) fiber amplifiers. It produces output pulses with 10 nJ pulse energy from single-mode fibers. Tailoring…
View article: Acceleration of electrons in THz driven structures for AXSIS
Acceleration of electrons in THz driven structures for AXSIS Open
View article: Laser system design for table-top X-ray light source
Laser system design for table-top X-ray light source Open
We present possible conceptual designs of a laser system for driving table-top free-electron lasers based on terahertz acceleration. After discussing the achievable performances of laser amplifiers with Yb:YAG at cryogenic and room tempera…
View article: Narrowband terahertz generation with chirped-and-delayed laser pulses in periodically poled lithium niobate
Narrowband terahertz generation with chirped-and-delayed laser pulses in periodically poled lithium niobate Open
We generate narrowband terahertz (THz) radiation in periodically poled lithium niobate (PPLN) crystals using two chirped-and-delayed driver pulses from a high-energy Ti:sapphire laser. The generated frequency is determined by the phase-mat…
View article: Pre-chirp managed nonlinear amplification for >100 W ultrafast sources
Pre-chirp managed nonlinear amplification for >100 W ultrafast sources Open
We proposed and demonstrated pre-chirp managed amplification (PCMA), in which the seeding pulse was nonlinearly amplified such that the amplified spectrum was substantially broadened. By properly pre-chirping the seeding pulse, the amplifi…
View article: 87-W, 1018-nm Yb-fiber ultrafast seeding source for cryogenic Yb:YLF amplifier
87-W, 1018-nm Yb-fiber ultrafast seeding source for cryogenic Yb:YLF amplifier Open
We demonstrate a compact Ytterbium-fiber MOPA system operating at 1018 nm, serving as powerful and compatible seed for cryogenically-cooled Yb:YLF amplifier. The output average power reaches 87 W with pulse energy of 4.9 µJ.
View article: Efficient narrowband terahertz generation in cryogenically cooled periodically poled lithium niobate
Efficient narrowband terahertz generation in cryogenically cooled periodically poled lithium niobate Open
We present an efficiency scaling study of optical rectification in cryogenically cooled periodically poled lithium niobate for the generation of narrowband terahertz radiation using ultrashort pulses. The results show an efficiency and bri…
View article: Theory of terahertz generation by optical rectification using tilted-pulse-fronts
Theory of terahertz generation by optical rectification using tilted-pulse-fronts Open
A model for terahertz (THz) generation by optical rectification using tilted-pulse-fronts is developed. It simultaneously accounts for in two spatial dimensions (2-D) (i) the spatio-temporal variations of the optical pump pulse imparted by…