Generation of multicycle terahertz pulses via optical rectification in periodically inverted GaAs structures

Lee, Yun-Shik; Hurlbut, Walter C.; Vodopyanov, Konstantin L.; Fejer, M. M.; Kozlov, V. G.

doi:10.1063/1.2367661

Cited by 34 publications

(21 citation statements)

References 13 publications

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“…Concerning excitation by sub-50 fs light pulses, there seems to be no fundamental reason why the AC-bias emission cannot reach into the 10's of THz range. Further studies using ultrabroadband detection (including interferometric correlation measurements with a thermal detector [79]) should be employed to accurately quantify the full emission bandwidth. To our knowledge, only limited reports exist for > 1 mJ pump pulses [26], and the impact of different focusing and SHG conditions is still to be studied in detail.…”

Section: Discussionmentioning

confidence: 99%

Broadband THz emission from gas plasmas induced by femtosecond optical pulses: From fundamentals to applications

Roskos¹,

Thomson

Kreß

et al. 2007

Laser & Photonics Reviews

439

196

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We review the generation of broadband THz radiation from femtosecond photo-induced gas plasmas, with an emphasis on the highly efficient "AC-bias" case where the plasma is generated and driven by a superposition of fundamental and second-harmonic optical fields. The dependence on experimental parameters such as pulse energy, air pressure, polarization and focusing are presented, and compared to the predictions from semi-quantitative models for the THz generation process, namely (i) a microscopic photocurrent model and (ii) a fourwave mixing model. We also employ these models to the case of few-cycle pulses, where the observed THz emission is related directly to the carrier-envelope phase of the pulses, and hence provides a mechanism with which to measure this phase. +THz generation in a photoinduced plasma using both fundamental and second-harmonic optical fields.

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Section: Discussionmentioning

confidence: 99%

Broadband THz emission from gas plasmas induced by femtosecond optical pulses: From fundamentals to applications

Roskos¹,

Thomson

Kreß

et al. 2007

Laser & Photonics Reviews

439

196

View full text Add to dashboard Cite

show abstract

“…For separation of difference frequency radiation from pumping radiation at 1.98 µm, it is necessary to transmit the z-polarized radiation from output of nonlinear crystal through a silicon or germanium filter1 3 . In numerical simulations the zpolarized pulse is filtered at the crystal output by a low-frequency filter with the coefficient of transmission 1/(1+(ν/ν s0 ) 6 ) where ν s0 =108.18 THz (λ s0 =2.77 µm). So, the filter transmits only the difference-frequency radiation.…”

Section: Computation Results and Discussionmentioning

confidence: 99%

“…Periodically polarized ferroelectric with regular onedimensional domain structure are the most promising 4,5 . For generation of difference frequency radiation an isotropic GaAs crystal with periodic domain structure is often [6][7][8] , which has a transparency band 0.9 17 µm and the coefficient of absorption 9 in the frequency range up to 3 THz lower than 5 cm -1 . The coefficient of nonlinear susceptibility of GaAs is sufficiently high and comparable with corresponding values for such crystals as ZnTe, GaP, and GaSe, which also are used for difference frequency generation.…”

Section: Introductionmentioning

confidence: 99%

GENERATION OF DIFFERENCE FREQUENCY RADIATION IN THE FIELD OF FEW-CYCLE LASER PULSE PROPAGATING IN GaAs CRYSTAL WITH PERIODIC AND APERIODIC DOMAIN STRUCTURE

Hovhannisyan

Chaltikyan

Hovhannisyan

2012

Int. J. Mod. Phys. Conf. Ser.

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We consider process of generation of difference frequency in a GaAs crystal with periodic domain structure during propagation of a few-cycle laser pulse in the crystal in the regime when chromatic dispersion is expressed weakly. Method of lines is used to obtain numerical solution to the system of coupled nonlinear differential equations in partial derivatives describing the evolution of the electric field of a few-cycle laser pulse in GaAs crystal both with periodic and aperiodic domain structure. Time-frequency distribution is obtained, with use of Wigner transformation, for linearlypolarized femtosecond laser pulse and for orthogonally polarized difference-frequency pulse generated via filtration of the orthogonally-polarized pulse at the crystal output.

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“…THz generation by nonlinear optical frequency downconversion in processes such as optical rectification (OR) and difference frequency generation (DFG) are less than 8.7 × 10 -4 . [1] The application of resonant cavity enhancement to the optical pulses using an optical parametric oscillator (OPO) to do intracavity DFG to produce THz waves is an obvious solution as each photon makes multiple passes through the nonlinear crystal improving overall efficiency. Previous work [2] at Stanford University demonstrated efficient THz generation using quasi-phase-matched (QPM) GaAs crystals to do intracavity DFG between the signal and idler waves in a type-II-phase-matched PPLN OPO.…”

Section: Introductionmentioning

confidence: 99%

THz-wave generation inside a high-finesse ring-cavity OPO pumped by a fiber laser

Hurlbut

Kozlov

Vodopyanov

2010

Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications IX

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Substantial improvement in the efficiency of photonic THz-wave generation via frequency downconversion results from resonant cavity enhancement. Previously, efficient THz wave generation was demonstrated at 2.8 THz by difference frequency mixing between resonating signal and idler waves of the linear-cavity type-II-phase-matched PPLN optical parametric oscillator (OPO). We present a new, simplified approach to resonantly-enhanced THz-wave generation in periodic GaAs, featuring (i) ring, instead of linear, OPO cavity with much higher finesse, (ii) type-0, instead of type-IIphase-matched PPLN crystal as a gain medium, resulting in much lower OPO threshold, (iii) a compact picosecond 1064-nm fiber laser as a pump source, and (iv) the use of a thin intracavity etalon with a free spectral range equal to the desired THz output frequency. 2.1 μm anti-reflection coated stacks of optically contacted GaAs wafers (OC-GaAs) and diffusion bonded GaAs wafers (DB-GaAs) with periodic-inversion were placed in the second OPO focal plane for intracavity THz generation. Narrowband output in the range 1.4 -3 THz was produced with more than 130 microwatts of average power at 1.5 THz using 6.6 W of average pump power. The demonstrated approach can be extended to generate 1-10 mW of THz output in a compact setup by optimizing the OPO PPLN crystal length and optimizing spectral characteristics of the fiber pump laser and OPO.

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Generation of multicycle terahertz pulses via optical rectification in periodically inverted GaAs structures

Cited by 34 publications

References 13 publications

Broadband THz emission from gas plasmas induced by femtosecond optical pulses: From fundamentals to applications

Broadband THz emission from gas plasmas induced by femtosecond optical pulses: From fundamentals to applications

GENERATION OF DIFFERENCE FREQUENCY RADIATION IN THE FIELD OF FEW-CYCLE LASER PULSE PROPAGATING IN GaAs CRYSTAL WITH PERIODIC AND APERIODIC DOMAIN STRUCTURE

THz-wave generation inside a high-finesse ring-cavity OPO pumped by a fiber laser

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