Theory of terahertz generation by optical rectification using tilted-pulse-fronts

Ravi, Koustuban; Huang, Wei-Chin; Carbajo, Sergio; Nanni, Emilio A.; Schimpf, Damian N.; Ippen, Erich P.; Kärtner, Franz X.

doi:10.1364/oe.23.005253

Cited by 67 publications

(54 citation statements)

References 38 publications

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“…Minimal Fresnel-losses can be achieved by perpendicular output hence the exit surface has to make an angle of d2 δ γ θ = − with the entrance surface. This δ wedge angle has to be as low as possible, since large δ limits the possible beam sizes because of the formation of an asymmetric THz beam profile [23]. In order to get high THz generation efficiency under given pump conditions (wavelength, transform limited pulse length, pulse energy, beam width) the pump pulse broadening caused by imaging errors has to be low and the diffraction efficiency on the CG has to be large.…”

Section: The Hybrid Tilted-pulse-front Schemementioning

confidence: 99%

Hybrid tilted-pulse-front excitation scheme for efficient generation of high-energy terahertz pulses

Pálfalvi¹,

Ollmann²,

Tokodi³

et al. 2016

Opt. Express

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Conception of a hybrid type tilted-pulse-front pumping scheme for the generation of high-energy terahertz pulses is presented. The proposed setup is the combination of the conventional setup containing imaging optics and the contact grating. The solution was developed for nonlinear materials requiring large pulse-front-tilt angle, like LiNbO₃. Due to the creation of the pulse-front-tilt in two steps the limitations of imaging errors can be significantly reduced. Furthermore the necessary grating constant of the contact grating can be larger compared to the simple contact grating scheme making possible the fabrication of the grating profile with significantly higher precision. A detailed optimization procedure with respect to the diffraction efficiency on the contact grating is given for LiNbO₃. Instructions are also given how to construct the geometry of the setup in order to minimize imaging errors. Examples are given for LiNbO₃ based practically realizable, optimized schemes with reduced imaging errors and high diffraction efficiency on the contact grating.

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Section: The Hybrid Tilted-pulse-front Schemementioning

confidence: 99%

Hybrid tilted-pulse-front excitation scheme for efficient generation of high-energy terahertz pulses

Pálfalvi¹,

Ollmann²,

Tokodi³

et al. 2016

Opt. Express

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show abstract

“…Consequently, this model overestimates the effective length and the conversion efficiency. Later on, in our previous work the interaction between the optical pump and the terahertz pulse is included into the 2D+1 model together with a one lens imaging system by K. Ravi [17]. Compared with the telescope imaging system, the one-lens imaging system, has larger imaging errors and induces more terahertz divergence [23].…”

Section: Introductionmentioning

confidence: 99%

Full 3D + 1 modeling of tilted-pulse-front setups for single-cycle terahertz generation

Wang¹,

Kroh²,

Matlis³

et al. 2020

J. Opt. Soc. Am. B

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The tilted-pulse-front setup utilizing a diffraction grating is one of the most successful methods to generate single-to few-cycle terahertz pulses. However, the generated terahertz pulses have a large spatial inhomogeneity, due to the noncollinear phase matching condition and the asymmetry of the prism-shaped nonlinear crystal geometry, especially when pushing for high optical-to-terahertz conversion efficiency. A 3D+1 (x,y,z,t) numerical model is necessary in order to fully investigate the terahertz generation problem in the tilted-pulse-front scheme. We compare in detail the differences between 1D+1, 2D+1 and 3D+1 models. The simulations show that the size of the optical beam in the pulse-front-tilt plane sensitively affects the spatio-temporal properties of the terahertz electric field. The terahertz electric field is found to have a strong spatial dependence such that a few-cycle pulse is only generated near the apex of the prism. The part of the beam farther from the apex contains a large fraction of the energy but has a waveform that deviates from a few-cycle. This strong spatial dependence must be accounted for when using the terahertz pulses for strong-field physics and carrier-envelope-phase sensitive experiments such as terahertz acceleration, coherent control of antiferromagnetic spin waves and terahertz high-harmonic generation. arXiv:1908.09581v1 [physics.optics]

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“…Although various methods [16] exist to generate THz radiation, laserbased nonlinear optical conversions via difference frequency generation (DFG) or optical rectification (OR) are the only ones suitable for short, high-energy pulses. Both processes allow for THz generation with intrinsic synchronization and high conversion efficiencies above 1% [17][18][19][20][21][22] . Thus, laser pulse energies in the range of 0.1 to 1 J are anticipated for the generation of multi-10-mJ THz pulses.…”

Section: Introductionmentioning

confidence: 99%

Laser system design for table-top X-ray light source

Calendron

Meier

Hemmer

et al. 2018

High Pow Laser Sci Eng

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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 temperature and Yb:YLF at cryogenic temperature, we present amplification modules with available results and concepts of amplifier chains based on these laser media. Their performances are discussed in light of the specifications for the tasks within the table-top light source. Technical and engineering challenges, such as cooling, control, synchronization and diagnostics, are outlined. Three concepts for the laser layout feeding the accelerator are eventually derived and presented.

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Theory of terahertz generation by optical rectification using tilted-pulse-fronts

Cited by 67 publications

References 38 publications

Hybrid tilted-pulse-front excitation scheme for efficient generation of high-energy terahertz pulses

Hybrid tilted-pulse-front excitation scheme for efficient generation of high-energy terahertz pulses

Full 3D + 1 modeling of tilted-pulse-front setups for single-cycle terahertz generation

Laser system design for table-top X-ray light source

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