Parametric cascade downconverter for intense ultrafast mid-infrared generation beyond the Manley-Rowe limit

Fraser, James M.; Ventalon, Cathie

doi:10.1364/ao.45.004109

Cited by 12 publications

(11 citation statements)

References 13 publications

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“…In the OR process, however, the red-shifted pump photon can be reused for the generation of a second THz photon, and the cascaded OR processes can give conversion efficiency much higher than the Manley-Rowe limit [19]. For DFG of two narrow band light fields, possibility of achieving high conversion efficiency using cascaded DFG processes has been analyzed [23,24].…”

Section: Introductionmentioning

confidence: 99%

Simulation study on cascaded terahertz pulse generation in electro-optic crystals

Hattori¹,

Takeuchi²

2007

Opt. Express

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We studied cascaded optical rectification processes for intense terahertz (THz) pulse generation in electro-optic crystals using simulations based on one-dimensional coupled propagation equations of THz and optical fields. We found that under ideal conditions of perfect phase matching and no absorption, cascaded optical rectification processes produce intense THz pulses with efficiencies exceeding the Manley-Rowe limit. Large red shifting of the pump light spectrum was observed. Effects of finite optical and THz absorption, phase mismatches, and pulse width were examined using parameters of a ZnTe crystal pumped by 800 nm pulses. THz field enhancement by multiple pulse pumping was also studied.

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Section: Introductionmentioning

confidence: 99%

Simulation study on cascaded terahertz pulse generation in electro-optic crystals

Hattori¹,

Takeuchi²

2007

Opt. Express

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“…When the output value (absolute) of equation (15) approaches to minimum (i.e. zero), it is corresponding to the phase match condition for the highest THz conversion efficiency.…”

Section: More Discussion Regarding To Thz Generation Using Chirp Drimentioning

confidence: 99%

“…Numerous novel ideas and delicate experimental techniques are proposed and established to generate and detect THz waves [9][10][11]. Among them, the optical rectification has been demonstrated to create THz pulses most efficiently, through applying the ultrafast laser to induce different frequency generation (DFG) in the THz photonic crystal [12][13][14][15][16]. In recent years, lithium niobate (LN), either in its stoichiometric or congruent crystalline form, turns into preferable THz generation media due to its large optical-to-THz conversion efficiency, compared to many others, e.g.…”

Section: Introductionmentioning

confidence: 99%

Chromatic effect in a novel THz generation scheme

Zhang

Liu

et al. 2017

New J. Phys.

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Deriving single or few cycle terahertz (THz) pulse by an intense femtosecond laser through cascaded optical rectification is a crucial technique in cutting-edge time-resolved spectroscopy to characterize micro-scale structures and ultrafast dynamics. Due to the broadband nature of the ultrafast driving laser, the chromatic effect limits the THz conversion efficiency in optical rectification crystals, especially for those implementing the pulse-front tilt scheme, e.g. lithium niobate (LN) crystal, has been prevalently used in the past decade. In this research we developed a brand new type of LN crystal utilizing Brewster coupling, and conducted systematically experimental and simulative investigation for the chromatic effect and multi-dimensionally entangled parameters in THz generation, predicting that an extreme conversion efficiency of ∼10% would be potentially achievable at the THz absorption coefficient of ∼0.5 cm −1. Moreover, we first discovered that the chirp of the driving laser plays a decisive role in the pulse-front tilt scheme, and the THz generation efficiency could be enhanced tremendously by applying an appropriate chirp.

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“…This amplified signal is then thrown away. Typical photon recycling schemes [27,28] or parametric cascaded downconverters [29] to surpass the Manley-Rowe limit cannot be invoked in terahertz systems due to the high terahertz absorption in the nonlinear crystals. However, the residual pump beams may be used (or recycled) to drive subsequent nonlinear mixing processes in a cascaded parametric process to further enhance conversion efficiency.…”

Section: Terahertz System Enhancementsmentioning

confidence: 99%

Compact fiber pumped terahertz source

et al. 2007

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Converting near infrared signals in a nonlinear medium is an attractive way to generate terahertz radiation due to the availability of near-IR lasers and nonlinear materials. However, these terahertz generation schemes are typically inefficient and are often cumbersome, which may limit their use in certain applications. We have developed and demonstrated a compact, fiber pumped optical terahertz source based difference frequency mixing (DFM) of nanosecond pulses in zinc germanium phosphide (ZGP). With this setup, we have successfully generated 2mW of average power terahertz radiation at 2.45THz. This has enabled us to perform active, real-time terahertz imaging experiments using an uncooled microbolometer array. In performing these experiments, we have also developed a theoretical model for terahertz generation based on DFM of IR pump signals. In this paper, we discuss our compact fiber pumped terahertz source technology, imaging system, model, and how we intend to overcome some of the common issues associated with optical terahertz generation.

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Parametric cascade downconverter for intense ultrafast mid-infrared generation beyond the Manley-Rowe limit

Cited by 12 publications

References 13 publications

Simulation study on cascaded terahertz pulse generation in electro-optic crystals

Simulation study on cascaded terahertz pulse generation in electro-optic crystals

Chromatic effect in a novel THz generation scheme

Compact fiber pumped terahertz source

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