Generation of narrow-band terahertz radiation via optical rectification of femtosecond pulses in periodically poled lithium niobate

Lee, Y.-S.; Meade, T.; Perlin, V.E.; Winful, Herbert G.; Norris, Theodore B.; Galvanauskas, Almantas

doi:10.1063/1.126390

Cited by 284 publications

(162 citation statements)

References 10 publications

(14 reference statements)

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“…As can be seen in Table 1, the THz refractive index for LN is significantly larger than the optical group index, and therefore no collinear velocity matching is possible. Quasi-phase matching in periodically poled LN can be used to enhance conversion efficiency, resulting in multi-cycle THz pulses [81,68] with a fixed number of cycles. In bulk LN, generation of single cycle THz pulses with high conversion efficiency can 22 be achieved by the tilted-pulse-front pumping technique with noncollinear velocity matching described in the following section.…”

Section: Methodsmentioning

confidence: 99%

Intense ultrashort terahertz pulses: generation and applications

Hoffmann¹,

Fülöp²

2011

J. Phys. D: Appl. Phys.

332

215

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Ultrashort terahertz pulses derived from femtosecond table-top sources have become a valuable tool for time-resolved spectroscopy during the last two decades. Until recently, the pulse energies and field strengths of these pulses have been generally too low to allow for the use as pump pulses or the study of nonlinear effects in the terahertz range. In this review article we will describe methods of generation of intense single cycle terahertz pulses with emphasis on optical rectification using the tilted-pulse-front pumping technique. We will also discuss some applications of these intense pulses in the emerging field of nonlinear terahertz spectroscopy.

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Section: Methodsmentioning

confidence: 99%

Intense ultrashort terahertz pulses: generation and applications

Hoffmann¹,

Fülöp²

2011

J. Phys. D: Appl. Phys.

332

215

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show abstract

“…The narrow-band THz seed pulses are generated by optical rectification of femtosecond laser pulse in a periodically poled lithium niobate (PPLN) crystal. 22,23 Although broad-band THz radiation can be generated in non-poled lithium niobate, 24 there is a large mismatch between the THz phase velocity and the group velocity of the 800 nm femtosecond laser pulses. This prevents efficient THz generation in a collinear geometry.…”

mentioning

confidence: 99%

“…The frequency of the forward (backward) generated wave is inversely proportional to the difference (sum) of the THz and optical group indices. 22,23 The PPLN crystal has multiple periodically poled regions with periodicities ranging from 18.50 to 20.90 lmin increments of 0.30 lm. The dimensions of the PPLN crystal are 5 Â 10 Â 0.5 mm and the dimension of each periodically poled region of the PPLN crystal is 5 Â 0.5 Â 0.5 mm.…”

mentioning

confidence: 99%

Narrow-band injection seeding of a terahertz frequency quantum cascade laser: Selection and suppression of longitudinal modes

Nong

Pal

Markmann

et al. 2014

Applied Physics Letters

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A periodically poled lithium niobate (PPLN) crystal with multiple poling periods is used to generate tunable narrow-bandwidth THz pulses for injection seeding a quantum cascade laser (QCL). We demonstrate that longitudinal modes of the quantum cascade laser close to the gain maximum can be selected or suppressed according to the seed spectrum. The QCL emission spectra obtained by electro-optic sampling from the quantum cascade laser, in the most favorable case, shows high selectivity and amplification of the longitudinal modes that overlap the frequency of the narrow-band seed. Proper selection of the narrow-band THz seed from the PPLN crystal discretely tunes the longitudinal mode emission of the quantum cascade laser. Moreover, the THz wave build-up within the laser cavity is studied as a function of the round-trip time. When the seed frequency is outside the maximum of the gain spectrum the laser emission shifts to the preferential longitudinal mode.

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“…Recently, QPM has been broadened to the THz frequency range via frequency down-conversion from near-IR to THz and has demonstrated the generation of multi-cycle and narrowband THz waves. 9,10) By the fact that the narrowband (<100 GHz) THz waves can interacted and excited not neighboring modes but target single-mode in materials, the QPM-based THz generation scheme is crucial in high-resolution imaging and spectroscopy. 11,12) Moreover, the narrowband THz waves allows to avoid the absorption band in water vapor, being useful in THz wireless communication.…”

mentioning

confidence: 99%

Temperature-dependent Sellmeier equation at terahertz frequency range for 1 mol % MgO-doped stoichiometric lithium tantalate

Lee

2017

Jpn. J. Appl. Phys.

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We first examined a temperature-dependent Sellmeier equation for the extraordinary refractive index of MgO-doped stoichiometric LiTaO 3 (MgO:SLT) crystal via frequency-tunable narrowband terahertz (THz) generation at 0.4-1.8 THz and at a low temperature range of 80-300 K. The mean deviation of Sellmeier equation fit was less than 0.3%, being equivalent with the predicted measurement uncertainty of 0.3%. The temperature effect (dn THz /dT ) was 2.02 ' 10 %3 /K at 1 THz. Moreover, we showed the smaller birefringence for MgO:SLT than MgO-doped stoichiometric LiNbO 3 at 300 K from THz time-domain spectroscopy. This study is crucial for material study itself and THz device engineering.© 2017 The Japan Society of Applied Physics T erahertz (THz) wave spectrum lies between far-IR waves and millimeter waves corresponding to the scientific fields of photonics and electronics, respectively, which has allowed to converged both unfamiliar technologies toward the THz frequency range owing to its various benefits. Recently, THz waves have been actively researched for its applications in nondestructive imaging and spectroscopy: explosive and illegal drug detection, 1) cancer cell diagnostics, 2) pesticide detection, 3) mail screening, 4) and gas sensing. 5) Moreover, THz waves have been highlighted as an alternative source for short-range wireless communication. 6) Lithium tantalate (LiTaO 3 , LT) crystals have been spotlighted as high-power THz wave sources owing to their various benefits for high energy-conversion efficiency and resistance to optical damage. Also quasi-phase-matching (QPM) method, predominantly using periodically poled structures of lithium niobate (LiNbO 3 , LN) and LT crystals, 7,8) has been extensively used for optical frequency conversion owing to its simple and wide tunability and high conversion efficiency. Recently, QPM has been broadened to the THz frequency range via frequency down-conversion from near-IR to THz and has demonstrated the generation of multi-cycle and narrowband THz waves. 9,10) By the fact that the narrowband (<100 GHz) THz waves can interacted and excited not neighboring modes but target single-mode in materials, the QPM-based THz generation scheme is crucial in high-resolution imaging and spectroscopy. 11,12) Moreover, the narrowband THz waves allows to avoid the absorption band in water vapor, being useful in THz wireless communication. 13) However, although the information of material dispersion is crucial in designing optical devices for THz applications, the studies in the optical constants at THz frequency range have still been left behind. Particularly, only a few studies about the temperature dependence of the refractive index and absorption coefficient for LT crystal at THz range have been reported 14,15) in contrast to LN. 14,[16][17][18][19] It has been noted that LT shows better performances for high-power THz generation than LN, such as the higher resistance to optical damage, higher photorefractive damage threshold, and lower green-induced infrared absorption, 20) whic...

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Generation of narrow-band terahertz radiation via optical rectification of femtosecond pulses in periodically poled lithium niobate

Cited by 284 publications

References 10 publications

Intense ultrashort terahertz pulses: generation and applications

Intense ultrashort terahertz pulses: generation and applications

Narrow-band injection seeding of a terahertz frequency quantum cascade laser: Selection and suppression of longitudinal modes

Temperature-dependent Sellmeier equation at terahertz frequency range for 1 mol % MgO-doped stoichiometric lithium tantalate

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