scholarly journals Simultaneous Generation of Two Orthogonally Polarized Terahertz Waves by Stimulated Polariton Scattering with a Periodically Poled LiNbO3 Crystal

Crystals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 304 ◽  
Author(s):  
Zhongyang Li ◽  
Silei Wang ◽  
Mengtao Wang ◽  
Bin Yuan ◽  
Pibin Bing
Keyword(s):  
Photon Flux ◽  
Phase Matching ◽  
Type I ◽  
Linbo3 Crystal ◽  
Periodically Poled ◽  
Simultaneous Generation ◽  
Thz Wave ◽  
Ppln Crystal ◽  
Coupled Wave Equations ◽  
Thz Waves

We present a theoretical investigation of the simultaneous generation of two orthogonally polarized terahertz (THz) waves by stimulated polariton scattering (SPS) with a periodically poled LiNbO3 (PPLN) crystal. The two orthogonally polarized THz waves are generated from SPS with A1 and E symmetric transverse optical (TO) modes in a LiNbO3 crystal, respectively. The parallel polarized THz wave is generated from A1 symmetric TO modes with type-0 phase-matching of e = e + e, and the perpendicular polarized THz wave is generated from E symmetric TO modes with type-I phase-matching of e = o + o. The two types of phase-matching of e = e + e and e = o + o can be almost satisfied simultaneously by accurately selecting the poling period of the PPLN crystal. We calculate the photon flux density of the two orthogonally polarized THz waves by solving the coupled wave equations. The calculation results indicate that the two orthogonally polarized THz waves can be efficiently generated, and the relative intensities between the two orthogonally polarized THz waves can be modulated.

scholarly journals Simultaneous Generation of Two Pairs of Stokes and Terahertz Waves from Coupled Optical Parametric Oscillations with Quasi-Phase-Matching

Crystals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 323 ◽  
Author(s):  
Zhongyang Li ◽  
Lian Tan ◽  
Yongjun Li ◽  
Bin Yuan ◽  
Silei Wang ◽  
...  
Keyword(s):  
Wave Equations ◽  
Photon Flux ◽  
Phase Matching ◽  
Terahertz Waves ◽  
Simultaneous Generation ◽  
Optical Parametric ◽  
Coupled Wave Equations ◽  
Quasi Phase Matching ◽  
Parametric Oscillations ◽  
Thz Waves

We present a theoretical investigation on simultaneous generation of two pairs of Stokes and terahertz (THz) waves from coupled optical parametric oscillations (OPOs) with a quasi-phase-matching (QPM) scheme. The two pairs of Stokes and THz waves are generated by stimulated polariton scattering (SPS) from periodically-inverted GaP. By analyzing the QPM conditions of coupled OPOs we find that the two THz waves with any frequency below the transverse optical (TO) mode frequency of GaP can be simultaneously generated with a suitable pump wavelength. We calculate the photon flux densities of the two THz waves by solving the coupled wave equations. The calculation results indicate that the two THz waves can be efficiently generated with high pump intensities, particularly in lower THz frequency band.

Investigation on terahertz parametric oscillators using quasi-phase-matching GaP crystal

2015 ◽  
Vol 29 (01) ◽  
pp. 1450258
Author(s):  
Z. Y. Li ◽  
P. B. Bing ◽  
S. Yuan ◽  
D. G. Xu ◽  
J. Q. Yao
Keyword(s):  
Frequency Tuning ◽  
Grating Period ◽  
Gain Medium ◽  
Terahertz Wave ◽  
Phase Matching ◽  
Periodically Poled ◽  
Parametric Oscillators ◽  
Thz Wave ◽  
Quasi Phase Matching ◽  
Absorption Characteristics

Terahertz parametric oscillator (TPO) using periodically inverted GaP stacks (PIGaPS) as gain medium with a quasi-phase-matching scheme is investigated. The frequency tuning characteristics of terahertz wave (THz-wave) are analyzed by varying the grating period of PIGaPS and the pump wavelength. Gain and absorption characteristics of THz-wave are also investigated. The characteristics of PIGaPS and periodically poled LiNbO 3 (PPLN) are compared when the two crystals used as gain medium for TPO. The analyses indicate that PIGaPS is more suitable than PPLN are used as the gain medium for TPO.

BANDWIDTH ENHANCEMENT METHODS OF TELECOM-REGION ENTANGLED TWIN PHOTONS VIA QUASI-PHASE-MATCHED SPONTANEOUS PARAMETRIC DOWN-CONVERSION

2006 ◽  
Vol 15 (04) ◽  
pp. 513-521 ◽  
Author(s):  
SHIMING GAO ◽  
CHANGXI YANG ◽  
DARU CHEN ◽  
SHAN QIN ◽  
YING GAO
Keyword(s):  
Type I ◽  
Periodically Poled ◽  
Bandwidth Enhancement ◽  
Broad Bandwidth ◽  
Wavelength Division ◽  
Periodically Poled Lithium Niobate ◽  
Wavelength Division Multiplexed ◽  
Ppln Crystal ◽  
Parametric Down Conversion ◽  
Down Conversion

We theoretically present the bandwidth enhancement methods of the telecom-region entangled twin photons generated by quasi-phase-matched (QPM) spontaneous parametric down-conversion (SPDC) in periodically poled lithium niobate (PPLN) crystals. By using type I (e → e + e) SPDC, the degenerate entangled twin photons will have a broad bandwidth and it can be further enhanced by shortening the crystal length, detuning the pump wavelength or adjusting the working temperature of the PPLN crystal. This principle provides the possibility to introduce wavelength-division-multiplexed technique into quantum information systems.

scholarly journals Numerical Investigation of High-Purity Entangled Photon-Pair Generation in Ba3Mg3(BO3)3F3 Crystals

Crystals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1164
Author(s):  
Donghwa Lee ◽  
Ilhwan Kim ◽  
Kwang Jo Lee
Keyword(s):  
High Purity ◽  
Photon Pair ◽  
Phase Matching ◽  
Type I ◽  
Type Ii ◽  
Periodically Poled ◽  
Extended Phase ◽  
Photon Pairs ◽  
Pair Generation ◽  
Spectral Ranges

We investigate the high-purity entangled photon pair generation in a recently developed borate crystal, Ba3Mg3(BO3)3F3. The technique is based on the spontaneous parametric down-conversion under the extended phase matching (EPM), where the phase matching and the group velocity matching between the interacting photons are satisfied simultaneously in bulk crystals with point symmetry of orthorhombic mm2 (thus showing biaxial birefringence). We will discuss all the theoretical aspects required for the generation of photon pairs in mm2 biaxial crystals, which are much more complex than the cases of uniaxial crystals (e.g., β-BaB2O4 and LiNbO3) and periodically poled crystals that are widely used in the field. Our study includes theoretical and numerical investigations of two types of EPM and their corresponding effective nonlinearities and spatial walk-offs. The results show that two types of EPM are satisfied over the specific range in the direction of pump wave vector, corresponding to its spectral ranges of 876.15–1052.77 nm for Type I and 883.92–914.33 nm for Type II. The joint spectral analyses show that photon-pairs can be generated with high purities of 0.997 with a proper pump filtering (for Type II), and 0.833 even without pump filtering (for Type I).

Blue 473-nm solid state diode pumped Nd:YAG/BiBO microchip laser

2010 ◽  
Vol 18 (1) ◽  
Author(s):  
A. Antończak ◽  
J. Sotor ◽  
M. Matysiak ◽  
K. Abramski
Keyword(s):  
Blue Light ◽  
Second Harmonic ◽  
Nonlinear Crystal ◽  
Phase Matching ◽  
Type I ◽  
Pumping Power ◽  
Diode Pumped ◽  
Light Generation ◽  
Power Diode ◽  
Matching Type

AbstractIn this paper we present a design of a compact, low power diode-pumped CW Nd:YAG laser operating at 946 nm with intracavity blue light generation at 473 nm for battery operated applications. The nonlinear crystal used in the experiment is a BiBO crystal cut for phase-matching type I. Using 0.8 W of pumping power, 20-mW stabile output power of blue light was achieved. The second harmonic generation conversion efficiency was 2.5%.

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