Title:
METHOD TO GENERATE TERAHERTZ RADIATION AND TERAHERTZ RADIATION SOURCE
Document Type and Number:
WIPO Patent Application WO/2017/081501
Kind Code:
A3
Abstract:
The present invention relates to a method for generating terahertz radiation, wherein a pump pulse is subjected to pulse front tilting, the thus obtained pump pulse having tilted pulse front is coupled into a nonlinear optical medium and THz pulse is generated by means of the optical medium in nonlinear optical processes, particularly by means of optical rectification by the pump pulse. The invention also relates to a terahertz radiation source (100), comprising a pump source (10) for emitting a pump pulse and a nonlinear optical medium for generating THz pulse. The pump source (10) and the nonlinear optical medium define together a light path, said light path is arranged to guide the pump pulse from the pump source (10) to the nonlinear optical medium. A first optical element (20) having angular-dispersion-inducing property and an imaging optics (30) are disposed in the light path after each other in the propagation direction of the pump pulse. The core of the method according to the invention is that the pulse front tilt of the pump pulse required to satisfy velocity matching condition of v cos(/) = vTHrf is induced as a sum of a plurality of pulse front tilts, each pulse front tilt is induced separately as a partial pulse front tilt of the pump pulse in subsequent steps, wherein vp;cs is the group velocity of the pump pulse, vr¾/is the phase velocity of the THz pulse, and γ is the angle formed between the pulse front and the phase front of said pump pulse. The radiation source (100) according to the invention also comprises at least one further optical element with angular-dispersion-inducing property is provided within said light path, said further optical element located after both the first optical element (20) having angular-dispersion-inducing property and the imaging optics (30) in the propagation direction of said pump pulse.
Inventors:
ALMÁSI GÁBOR (HU)
FÜLÖP JÓZSEF ANDRÁS (HU)
HEBLING JÁNOS (HU)
OLLMANN ZOLTÁN (HU)
PÁLFALVI LÁSZLÓ (HU)
FÜLÖP JÓZSEF ANDRÁS (HU)
HEBLING JÁNOS (HU)
OLLMANN ZOLTÁN (HU)
PÁLFALVI LÁSZLÓ (HU)
Application Number:
PCT/HU2016/050046
Publication Date:
July 13, 2017
Filing Date:
September 30, 2016
Export Citation:
Assignee:
PÉCSI TUDOMÁNYEGYETEM (HU)
International Classes:
G02F1/35
Foreign References:
| JP2014044365A | 2014-03-13 |
Other References:
MICHAEL I. BAKUNOV ET AL: "Terahertz generation with tilted-front laser pulses in a contact-grating scheme", JOURNAL OF THE OPTICAL SOCIETY OF AMERICA - B., vol. 31, no. 11, 1 November 2014 (2014-11-01), US, pages 2549, XP055375492, ISSN: 0740-3224, DOI: 10.1364/JOSAB.31.002549
L. PÁLFALVI ET AL: "Hybrid tilted-pulse-front excitation scheme for efficient generation of high-energy terahertz pulses", OPTICS EXPRESS, vol. 24, no. 8, 6 April 2016 (2016-04-06), pages 8156, XP055375597, DOI: 10.1364/OE.24.008156
L. PÁLFALVI ET AL: "Hybrid tilted-pulse-front excitation scheme for efficient generation of high-energy terahertz pulses", OPTICS EXPRESS, vol. 24, no. 8, 6 April 2016 (2016-04-06), pages 8156, XP055375597, DOI: 10.1364/OE.24.008156
Attorney, Agent or Firm:
DANUBIA PATENT & LAW OFFICE LLC (HU)
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