Prospects of semiconductor terahertz pulse sources

Polónyi, Gyula; Monoszlai, B.; Mechler, Mátyás; Hebling, J.; Fülöp, J. A.

doi:10.1109/cleoe-eqec.2017.8086422

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…The attempts to mitigate this problem by using contacting grating [7], stair-step echelons [8,9], and its combination with reflecting grating [10]) still do not result in the THz generation with energy or efficiency close to the abovementioned values. It is well established [11,12] that effective interaction length in the semiconductor materials such as ZnTe, GaP, and GaAs, can be significantly larger due to operation ability at smaller tilt angles < 30 and lower THz-wave absorption at room temperature. However, to escape 2nd-and 3rd-order multiphoton pump absorption (MPA), these materials have to be pumped at longer wavelengths p  1.7 m, where it is still relatively challenging to obtain femtosecond laser pulses with required high power.…”

Section: Introductionmentioning

confidence: 99%

Nearly Single-Cycle Terahertz Pulse Generation in Aperiodically Poled Lithium Niobate

Avetisyan¹,

Tonouchi²

2018

Preprint

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In present work an opportunity of nearly single-cycle THz pulse generation in aperiodically poled lithium niobate (APPLN) crystal is studied. A radiating antenna model is used to simulate the THz generation from chirped APPLN crystal pumped by a sequence of femtosecond laser pulses with chirped delays m (m = 1, 2, 3 …) between adjacent pulses. It is shown that by appropriative choosing m it is possible to obtain temporally overlap of all THz pulses generated from positive (or negative) domains. It results in the formation of a nearly single-cycle THz pulse, if the chirp rate of domain length  in the crystal is sufficiently large. In opposite case, a few cycle THz pulses are generated with the number of the cycles depending on . The closed form expression for THz pulse form is obtained. The peak THz electric field strength of 0.3 MV/cm is predicted for APPLN crystal pumped by the sequence of laser pulses with peak intensity of the separate pulse in the sequence about 20 GW/cm2. By focusing the THz beam and by increasing the pump power the field strength can reach values of an order of few MV/cm.

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Section: Introductionmentioning

confidence: 99%

Nearly Single-Cycle Terahertz Pulse Generation in Aperiodically Poled Lithium Niobate

Avetisyan¹,

Tonouchi²

2018

Preprint

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“…Lithium tantalate (LT), having similarly good optical properties, is a good alternative at shorter (800 nm) pump wavelengths [10], where one has to take care for avoiding the three-photon absorption. Recent results show that semiconductors, such as ZnTe [11] or GaP [12] can be applied for efficient THz generation, too if longer pump wavelengths are used in order to reduce low order multiphoton absorption. For such long wavelength pumping there is significant refractive index difference between the optical and the THz region in these cases as well.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of a scalable setup for efficient terahertz generation using a segmented tilted-pulse-front excitation

et al. 2017

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A hybrid-type terahertz pulse source is proposed for high energy terahertz pulse generation. It is the combination of the conventional tilted-pulse-front setup and a transmission stair-step echelon-faced nonlinear crystal with a period falling in the hundred-micrometer range. The most important advantage of the setup is the possibility of using plane parallel nonlinear optical crystal for producing good-quality, symmetric terahertz beam. Another advantage of the proposed setup is the significant reduction of imaging errors, which is important in the case of wide pump beams that are used in high energy experiments. A one dimensional model was developed for determining the terahertz generation efficiency, and it was used for quantitative comparison between the proposed new hybrid setup and previously introduced terahertz sources. With lithium niobate nonlinear material, calculations predict an approximately ten-fold increase in the efficiency of the presently described hybrid terahertz pulse source with respect to that of the earlier proposed setup, which utilizes a reflective stair-step echelon and a prism shaped nonlinear optical crystal. By using pump pulses of 50 mJ pulse energy, 500 fs pulse length and 8 mm beam spot radius, approximately 1% conversion efficiency and 0.5 mJ terahertz pulse energy can be reached with the newly proposed setup.

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“…This issue may be alleviated using a superposition of beamlets [31][32][33] and variants thereof [34,35]. Alternatively, attempts to eliminate the drawbacks of tilted pulse fronts in lithium niobate by utilizing smaller pulse-front tilt angles are being pursued [36,37].…”

mentioning

confidence: 99%

Simultaneous generation and compression of broadband terahertz pulses in aperiodically poled crystals

Ravi¹,

Kärtner²

2019

Opt. Express

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We introduce a technique to generate compressed broadband terahertz pulses based on cascaded difference-frequency generation. The approach employs a non-uniform sequence of pump pulses in aperiodically poled crystals. The pump-pulse format and poling of crystals conceived are such that the emergent terahertz pulse is already compressed. The method circumvents pump-pulse distortions that result from non-collinear approaches and the need for external compression. While capable of generating even single-cycle pulses, it is particularly efficient for the generation of pulses with few to tens-of-cycles duration. For instance, calculations accounting for cascading effects predict conversion efficiencies in the few percent range for cryogenically-cooled lithium niobate. The focused electric fields are 100 MV/m in free space.

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Prospects of semiconductor terahertz pulse sources

Cited by 3 publications

References 5 publications

Nearly Single-Cycle Terahertz Pulse Generation in Aperiodically Poled Lithium Niobate

Nearly Single-Cycle Terahertz Pulse Generation in Aperiodically Poled Lithium Niobate

Numerical investigation of a scalable setup for efficient terahertz generation using a segmented tilted-pulse-front excitation

Simultaneous generation and compression of broadband terahertz pulses in aperiodically poled crystals

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