Enhanced Cherenkov phase matching terahertz wave generation via a magnesium oxide doped lithium niobate ridged waveguide crystal

Takeya, Kei; Minami, Tsubasa; Okano, Hiroaki; Tripathi, Saroj R.; Kawase, Kodo

doi:10.1063/1.4968043

Cited by 40 publications

(37 citation statements)

References 26 publications

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“…A breakthrough came that the optical damage resistance of LiNbO 3 could be improved at least two orders of magnitude when 4.6 mol.% MgO was doped into 11 , 12 . From then on, MgO-doped LiNbO 3 (Mg:LN) has become the often used material in frequency conversion, optical waveguide, optical parametric oscillation and terahertz source 13 – 17 . But for infrared-to-visible nonlinear frequency conversion, the phase-matching temperature is usually above 100 °C, so a precise temperature-controlled stove is needed.…”

Section: Introductionmentioning

confidence: 99%

Room temperature 90° phase-matching in zirconium and magnesium co-doped lithium niobate crystals

Kong

Liu

et al. 2018

Sci Rep

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Laser has been widely used in many aspects, by now it is difficult to get each frequency that we want, and frequency conversion is an effective way to obtain different frequency laser through a nonlinear optical crystal. MgO-doped LiNbO3 (Mg:LN) crystal has usually been used for second harmonic generation (SHG) through temperature-matching configuration with a stove, till now a room temperature 90° phase-matching is still lacking. Here we find that the SHG of Nd:YAG laser is achieved at 26.1 °C while the optical damage resistance is higher than 6.5 MW/cm2 in the ZrO2 and MgO co-doped LiNbO3 (Zr,Mg:LN) crystal. Moreover, the monotonic decrease of phase-matching temperature is firstly found with the increase of doping concentration. These unusual properties may be attributed to the formation of + defect pairs. Our work suggests that Zr,Mg:LN crystal may be an attractive candidate for nonlinear optical applications.

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Section: Introductionmentioning

confidence: 99%

Room temperature 90° phase-matching in zirconium and magnesium co-doped lithium niobate crystals

Kong

Liu

et al. 2018

Sci Rep

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“…The generated power scales with the product of the intensities of the two pump beams; as a consequence, the emitted THz power can be also enhanced by confining the THz radiation in a small space. To this purpose, ridged [87] and implanted (Garcia Lopez et al, submitted for publication) waveguides have been realized, achieving efficiencies of 10 −9 in the THz generation.…”

Section: Frequency Down-conversion Of Visible/infrared Light In Non-lmentioning

confidence: 99%

Terahertz Frequency Metrology for Spectroscopic Applications: a Review

Consolino

Bartalini

Natale

2017

J Infrared Milli Terahz Waves

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We provide an overview on terahertz (THz) frequency metrology, starting from the nowadays available continuous wave THz sources, discussing their main features such as tunability, spectral purity, and frequency referencing to the primary frequency standards. A comparison on the achieved results in high-precision molecular spectroscopy is given and discussed, and finally, a special emphasis poses on the future developments of this upcoming field.

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“…3 A cryogenically cooled LN crystal can further enhance the THz-generation efficiency. [4][5][6] To obtain high power THz waves with the desirable bandwidth, the specific design of LN crystals such as MgO-doped LN ridged waveguide 7 and transversely patterned periodically poled LN (PPLN) 8,9 has also been demonstrated. These intense THz electric fields can introduce intriguing nonlinear properties in various materials such as THz-field-induced photovoltaic effects, phase transitions, electron tunneling, and anharmonic vibrations of ferroelectric soft modes.…”

Section: Introductionmentioning

confidence: 99%

Anharmonic phonon-polariton dynamics in ferroelectric LiNbO3 studied with single-shot pump-probe imaging spectroscopy

Kuribayashi

Motoyama

Arashida

et al. 2018

Journal of Applied Physics

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We demonstrate that single-shot pump-probe imaging spectroscopy with an echelon mirror enables us to disclose the ferroelectric phonon-polariton dynamics across a wide temperature range from 10 K to 375 K while avoiding the photorefractive effects that appear prominently at low temperatures. The E-mode phonon-polaritons corresponding to the two transverse optical modes, TO 1 and TO 3 , up to $7 THz were induced in LiNbO 3 through an impulsive stimulated Raman scattering process. Subsequently, using single-shot pump-probe imaging spectroscopy over a minimal cumulative time, we successfully visualized the phonon-polariton dynamics in time-wavelength space even at low temperatures. We found that the phase-matching condition significantly affected the observed temperature-dependent phonon-polariton frequency shift. The anharmonicity of the TO 1 and TO 3 modes was then evaluated based on an anharmonic model involving higher-order interactions with acoustic phonons while eliminating the influence of the frequency shift due to the phase-matching condition. The observed wavenumber-dependent damping rate was analyzed by considering the bilinear coupling of the TO 1 or TO 3 modes with the thermally activated relaxation mode. We found that the phonon-polariton with a higher frequency and wavenumber had a higher damping rate at high temperatures because of its frequent interaction with the thermally activated relaxation mode and acoustic phonons. The TO 3 mode displayed greater bilinear coupling than the TO 1 mode, which may also have contributed to the observed high damping rate. Thus, using our unique single-shot spectroscopy technique, we could reveal the overall anharmonic characteristics of the E-mode phonon-polaritons arising from both the acoustic phonons and the relaxation mode.

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Enhanced Cherenkov phase matching terahertz wave generation via a magnesium oxide doped lithium niobate ridged waveguide crystal

Cited by 40 publications

References 26 publications

Room temperature 90° phase-matching in zirconium and magnesium co-doped lithium niobate crystals

Room temperature 90° phase-matching in zirconium and magnesium co-doped lithium niobate crystals

Terahertz Frequency Metrology for Spectroscopic Applications: a Review

Anharmonic phonon-polariton dynamics in ferroelectric LiNbO3 studied with single-shot pump-probe imaging spectroscopy

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