Tunable THz pulse generation by optical rectification of ultrashort laser pulses with tilted pulse fronts

Hebling, J.; Степанов, А. Л.; Almási, Gábor; Bartal, B.; Kühl, J.

doi:10.1007/s00340-004-1469-7

Cited by 235 publications

(121 citation statements)

References 28 publications

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“…As can be seen in Table 1 the materials with the highest FOM (DAST, LN, CdTe) have relatively large absorption in the THz range, which can seriously reduce the output THz energy by restricting the effective material length to only a few mm or less. As indicated for LN [92], cooling down to cryogenic temperatures can significantly reduce the absorption coefficient. On the other hand, longer propagation distance inside the nonlinear medium leads to dispersion in the THz range, causing temporally stretched THz pulses which have a reduced THz peak electric field.…”

Section: 3perspectives and Limitationsmentioning

confidence: 99%

Intense ultrashort terahertz pulses: generation and applications

Hoffmann¹,

Fülöp²

2011

J. Phys. D: Appl. Phys.

332

215

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Ultrashort terahertz pulses derived from femtosecond table-top sources have become a valuable tool for time-resolved spectroscopy during the last two decades. Until recently, the pulse energies and field strengths of these pulses have been generally too low to allow for the use as pump pulses or the study of nonlinear effects in the terahertz range. In this review article we will describe methods of generation of intense single cycle terahertz pulses with emphasis on optical rectification using the tilted-pulse-front pumping technique. We will also discuss some applications of these intense pulses in the emerging field of nonlinear terahertz spectroscopy.

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Section: 3perspectives and Limitationsmentioning

confidence: 99%

Intense ultrashort terahertz pulses: generation and applications

Hoffmann¹,

Fülöp²

2011

J. Phys. D: Appl. Phys.

332

215

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“…184 The strong Mg dopant concentration dependence of THz absorption suggested the use of sLN crystals with the optimal % 0.7 mol. % Mg content 181 It was shown that imaging conditions have to be set in a way that the TPF and the image of the grating become tangential to each other inside the crystal in order to obtain the optimal transform limited pump pulse length values along the TPF.…”

Section: à5mentioning

confidence: 99%

“…The TPF THz generation setups used in experiments [183][184][185][186][189][190][191][192] suffer from imaging errors, leading to local broadening of pump pulses along the tilted pulse front resulting in a limitation for the pump spot size and for the THz pulse energy. 187 In order to exclude this limiting factor, a so called contact-grating setup was proposed, which means that a relief dielectric periodic structure is etched on the crystal surface making the imaging optics superfluous.…”

Section: à5mentioning

confidence: 99%

Growth, defect structure, and THz application of stoichiometric lithium niobate

Lengyel

Péter

Kovács

et al. 2015

Applied Physics Reviews

Self Cite

104

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Owing to the extraordinary richness of its physical properties, congruent lithium niobate has attracted multidecade-long interest both for fundamental science and applications. The combination of ferro-, pyro-, and piezoelectric properties with large electro-optic, acousto-optic, and photoelastic coefficients as well as the strong photorefractive and photovoltaic effects offers a great potential for applications in modern optics. To provide powerful optical components in high energy laser applications, tailoring of key material parameters, especially stoichiometry, is required. This paper reviews the state of the art of growing large stoichiometric LiNbO 3 (sLN) crystals, in particular, the defect engineering of pure and doped sLN with emphasis on optical damage resistant (ODR) dopants (e.g., Mg, Zn, In, Sc, Hf, Zr, Sn). The discussion is focused on crystals grown by the high temperature top seeded solution growth (HTTSSG) technique using alkali oxide fluxing agents. Based on high-temperature phase equilibria studies of the Li 2 O-Nb 2 O 5 -X 2 O ternary systems (X ¼ Na, K, Rb, Cs), the impact of alkali homologue additives on the stoichiometry of the lithium niobate phase will be analyzed, together with a summary of the ultraviolet, infrared, and far-infrared absorption spectroscopic methods developed to characterize the composition of the crystals. It will be shown that using HTTSSG from K 2 O containing flux, crystals closest to the stoichiometric composition can be grown characterized by a UV-edge position of at about 302 nm and a single narrow hydroxyl band in the IR with a linewidth of less than 3 cm À1 at 300 K. The threshold concentrations for ODR dopants depend on crystal stoichiometry and the valence of the dopants; Raman spectra, hydroxyl vibration spectra, and Z-scan measurements prove to be useful to distinguish crystals below and above the photorefractive threshold. Crystals just above the threshold are preferred for most nonlinear optical applications apart holography and have the additional advantage to minimize the absorption even in the far-infrared (THz) range. The review also provides a discussion on the progress made in the characterization of non-stoichiometry related intrinsic and extrinsic defect structures in doped LN crystals, with emphasis on ODR-ion-doped and/or closely stoichiometric systems, based on both spectroscopic measurements and theoretical modelling, including the results of first principles quantum mechanical calculations on hydroxyl defects. It will also be shown that new perspective applications, e.g., the generation of high energy THz pulses with energies on the tens-of-mJ scale, are feasible with ODR-doped sLN crystals if optimal conditions, including the contact grating technique, are applied. V C 2015 AIP Publishing LLC.

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“…With the same pump energy it was possible to increase the THz energy to 100 pJ by using a better quality (Mg-doped stoichiometric) LN crystal (Hebling et al, 2004). A 200-times increase in the pump energy resulted in 2000 times larger THz energy (Stepanov et al, 2005).…”

Section: Generation Of Thz Pulses By Optical Rectificationmentioning

confidence: 99%

“…In order to deal with this problem in THz pulse generation a setup depicted in Fig. 12(a) is used for tilted-pulse-front excitation (Hebling et al 2004). The necessary angular dispersion is introduced by the grating.…”

Section: Generation Of Thz Pulses By Optical Rectificationmentioning

confidence: 99%