Scaling submillimeter single-cycle transients toward megavolts per centimeter field strength via optical rectification in the organic crystal OH1

Ruchert, Clemens; Vicario, C.; Hauri, Christoph P.

doi:10.1364/ol.37.000899

Cited by 94 publications

(67 citation statements)

References 19 publications

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“…In the past several years, significant progress has occurred utilizing both laser-based and accelerator-based approaches for generating high fields in the 1-10 THz frequency range. Laser-based sources have enabled pulses with peak fields of order 1 MV/cm and energies of ~10-100 μJ at frequencies near 1 THz [1][2][3][4][5][6][7][8][9]. Nevertheless, many field-driven processes remain out of reach at these field strengths, and accelerator based sources, based on coherent radiation from relativistic electron beams, represent an alternative pathway towards the generation of extreme fields, reaching sizable fractions of interatomic fields in matter [10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Below gap optical absorption in GaAs driven by intense, single-cycle coherent transition radiation

et al. 2014

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Ghimire, S.; Chen, F.; Loos, H.; Reis, D. A.; Fisher, A. S.; and Lindenberg, A. M., "Below gap optical absorption in GaAs driven by intense, single-cycle coherent transition radiation" (2014 Abstract: Single-cycle terahertz fields generated by coherent transition radiation from a relativistic electron beam are used to study the high field optical response of single crystal GaAs. Large amplitude changes in the sub-band-gap optical absorption are induced and probed dynamically by measuring the absorption of a broad-band optical beam generated by transition radiation from the same electron bunch, providing an absolutely synchronized pump and probe geometry. This modification of the optical properties is consistent with strong-field-induced electroabsorption. These processes are pertinent to a wide range of nonlinear terahertz-driven lightmatter interactions anticipated at accelerator-based sources. Technol. 71(8), 504-508 (2004).

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Section: Introductionmentioning

confidence: 99%

Below gap optical absorption in GaAs driven by intense, single-cycle coherent transition radiation

et al. 2014

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“…Near-single-cycle THz pulses in the frequency range of 3-9 THz can be generated by two-color photoionization in gases [11] but in this frequency range, the laser-to-THz conversion efficiency is not high enough to provide generation of high-energy THz pulses. Organic crystals have recently been shown to emit efficiently across the 1-10 THz range [12][13][14][15][16][17]. Pumped with a near infrared laser (1.3-1.5 m) excellent phase-matching provides high conversion efficiency (1-2%) and large THz pulse energies (<50 J).…”

Section: Introductionmentioning

confidence: 99%

Tailoring single-cycle electromagnetic pulses in the 2–9 THz frequency range using DAST/SiO_2 multilayer structures pumped at Ti:sapphire wavelength

Степанов¹,

Rogov²,

Bonacina³

et al. 2014

Opt. Express

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Abstract:We present a numerical parametric study of single-cycle electromagnetic pulse generation in a DAST/SiO 2 multilayer structure via collinear optical rectification of 800 nm femtosecond laser pulses. It is shown that modifications of the thicknesses of the DAST and SiO 2 layers allow tuning of the average frequency of the generated THz pulses in the frequency range from 3 to 6 THz. The laser-to-THz energy conversion efficiency in the proposed structures is compared with that in a bulk DAST crystal and a quasi-phase-matching periodically poled DAST crystal and shows significant enhancement. Ito, and T. Sasaki, "Growth of ultrathin and highly efficient organic nonlinear optical crystal 4′-dimethylamino-N-methyl-4-stilbazolium p-chlorobenzenesulfonate for enhanced terahertz efficiency at higher frequencies," Cryst. Growth Des. 13(2), 415−421 (2013). ©2014 Optical Society of America

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“…20 In particular, the SB approach is useful for all collinearly pumped crystals showing saturation of THz emission, for example organic crystals. 21 The experimental implementation of schemes RC and SB is schematically shown in Figs. 1(c) and 1(d), respectively.…”

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Terahertz field enhancement via coherent superposition of the pulse sequences after a single optical-rectification crystal

Sajadi

Wolf

Kampfrath

2014

Applied Physics Letters

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Terahertz electromagnetic pulses are frequently generated by optical rectification of femtosecond laser pulses. In many cases, the efficiency of this process is known to saturate with increasing intensity of the generation beam because of two-photon absorption. Here, we demonstrate two routes to reduce this effect in ZnTe(110) crystals and enhance efficiency, namely by (i) recycling the generation pulses and by (ii) splitting each generation pulse into two pulses before pumping the crystal. In both methods, the second pulse arrives ~1 ns after the first one, sufficiently long for optically generated carriers to relax. Enhancement is achieved by coherently superimposing the two resulting terahertz fields.Over the past two decades, electromagnetic radiation from the terahertz (THz) frequency window has proven to be a highly useful probe of numerous fundamental excitations such as crystal lattice vibrations (in particular in molecular crystals), 1 free or weakly bound electrons, 2,3 spin waves, 4 and spin currents. 5 In addition to such linear THz probing, the availability of intense THz pulses has recently opened the door to applications like nonlinear THz spectroscopy, 6 THz control over matter and light 7,8 and large-area imaging. 9 Table-top sources of strong THz fields generally rely on frequency conversion of intense femtosecond laser pulses in various media, for example, optical rectification (OR) in nonlinear-optical crystals, large-area photoconductive antennas or, in gases, the mixing of the fundamental optical beam and its second harmonic.10 A frequently employed material for OR is the nonlinear-optical crystal ZnTe, because of its relatively large second-order optical nonlinearity, low THz absorption (absorption coefficient 1.3 cm -1 at 1THz) and a relatively large phase-matching coherence length ( >1 mm for 1 to 3 THz and 800 nm). 11One may expect higher OR efficiency in ZnTe by just rising the pump intensity or increasing the thickness of the ZnTe crystal. However, this strategy is severely limited because additional nonlinear optical processes become operative. In particular, two-photon absorption (2PA) of the pump beam results in the loss of pump energy and the generation of free charge carriers that dissipate the THz radiation through Drude-type or free-carrier absorption (FCA).12 Consequently, the generated THz power saturates when the pump power is increased further. 12,13,14,15 The use of thicker crystals is also problematic as it increases the 2PA-related FCA of THz radiation. (For example, if the thickness of the ZnTe crystal is doubled, THz waves generated in the first half slice of the crystal will undergo additional absorption in the second half slice.)To keep the impact of 2PA and, thus, FCA on a tolerable level, ZnTe(110) crystals with larger aperture have been used, resulting in reduced pump intensity (power per area) and increased opticalto-THz conversion efficiency. 16,17 For example, using a ZnTe wafer with a diameter as large as 75 mm and an 800-nm pump pulse with an energy of 48 mJ,...

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Scaling submillimeter single-cycle transients toward megavolts per centimeter field strength via optical rectification in the organic crystal OH1

Cited by 94 publications

References 19 publications

Below gap optical absorption in GaAs driven by intense, single-cycle coherent transition radiation

Below gap optical absorption in GaAs driven by intense, single-cycle coherent transition radiation

Tailoring single-cycle electromagnetic pulses in the 2–9 THz frequency range using DAST/SiO_2 multilayer structures pumped at Ti:sapphire wavelength

Terahertz field enhancement via coherent superposition of the pulse sequences after a single optical-rectification crystal

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