Suppression of mid-infrared light absorption in undoped congruent lithium niobate crystals

Schwesyg, Judith R.; Phillips, Colin R.; Ioakeimidi, K.; Kajiyama, Maria Claudia C.; Falk, Matthias; Jundt, D. H.; Buse, K.; Fejer, M. M.

doi:10.1364/ol.35.001070

Cited by 26 publications

(19 citation statements)

References 11 publications

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“…It is the overtone of a known OH − absorption band, centered at 2871 nm. 15 Towards higher wavelengths, the value drops to its minimum of 10 −4 cm −1 between 1700 and 2100 nm, before rising again beyond 2100 nm. The known peaks here at 2255 nm, 2310 nm and 2487 nm result from mixed OH − stretching and libration transitions 16 and can be partially seen in the produced spectra.…”

Section: Extinction Spectramentioning

confidence: 95%

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Highly sensitive absorption measurements in lithium niobate using whispering gallery resonators

2015

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The absorption coefficient of undoped, congruently grown lithium niobate (LiNbO3) for ordinarily and extraordinarily polarized light is measured in the wavelength range from 390 to 2600 nm using whispering gallery resonators (WGRs). These monolithic cavities guide light by total internal reflection. Their high Q-factor provides several hundred meters of propagation for the coupled light in millimetre size resonators allowing for the measurement of absorption coefficients below 10-2 cm-1, where standard methods such as Fourier-transform or grating spectroscopy meet their limit. In this work the lowest measured value is 10-4 cm-1 at 1700 nm wavelength. Furthermore, the known OH-overtone at 1470 nm wavelength can be resolved clearly

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Section: Extinction Spectramentioning

confidence: 95%

“…For supression the OH − bands beyond 2100 nm, annealing is proposed in Ref. 15. For reduction of the absorption caused by Fe 2+ , thermo-electric oxidization is possible.…”

Section: Extinction Spectramentioning

confidence: 99%

Highly sensitive absorption measurements in lithium niobate using whispering gallery resonators

2015

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“…As a matter of fact, to achieve Cherenkov phase-matching, it is crucial that the pump fields propagate in the nonlinear medium faster than the THz light, as in the case of infrared pumps and LN crystals. Because of this latter feature and of the strong nonlinearities [46,47], combined with the high photorefractive damage threshold [48,49] and the low absorption coefficient, in the order of 10 −4 cm −1 in the infrared spectral region [50], 5% MgO-doped LN is widely used for THz experiments.…”

Section: Waveguided Cherenkov Nonlinear Generationmentioning

confidence: 99%

Room-Temperature Continuous-Wave Frequency-Referenced Spectrometer up to 7.5 THz

et al. 2018

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The lack of coherent room-temperature sources in the whole terahertz spectral window (0.3-10 THz) has significantly hampered the growth of scientific and technological applications in this range. Among them, highprecision frequency measurements of molecular transitions play a central role but remain an open challenge. Here, room-temperature generation and detection of continuous-wave, broadly tunable, narrow-linewidth THz radiation are presented, and their application to high-resolution spectroscopy in the broad 1-7.5 THz spectral range is demonstrated. This result has been achieved by implementing a Cherenkov phase-matching scheme into a channel waveguide in a nonlinear crystal. This simple approach, entirely based on robust telecom technology, unprecedently merges in a single source an ultra-broad continuous wave spectral coverage and a state-of-the-art accuracy (∼ 10 −9 ) in molecular transition center determination.

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“…As the absorption here is larger than 10 −2 cm −1 , the edges can be resolved easily by standard methods, such as GS and FTIR. Published absorption spectra for undoped LiNbO 3 also exist only for the edges of the transparency window [9,10]. In the range from 800 to 2000 nm the absorption coefficient is still not known, as GS and FTIR reach their detection limit (see Fig.…”

Section: Sample Preparation and Characteristicsmentioning

confidence: 99%

Comparative study on three highly sensitive absorption measurement techniques characterizing lithium niobate over its entire transparent spectral range

Leidinger¹,

Fieberg²,

Waasem³

et al. 2015

Opt. Express

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121

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We employ three highly sensitive spectrometers: a photoacoustic spectrometer, a photothermal common-path interferometer and a whispering-gallery-resonator-based absorption spectrometer, for a comparative study of measuring the absorption coefficient of nominally transparent undoped, congruently grown lithium niobate for ordinarily and extraordinarily polarized light in the wavelength range from 390 to 3800 nm. The absorption coefficient ranges from below 10(-4) cm(-1) up to 2 cm(-1). Furthermore, we measure the absorption at the Urbach tail as well as the multiphonon edge of the material by a standard grating spectrometer and a Fourier-transform infrared spectrometer, providing for the first time an absorption spectrum of the whole transparency window of lithium niobate. The absorption coefficients obtained by the three highly sensitive and independent methods show good agreement.

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Suppression of mid-infrared light absorption in undoped congruent lithium niobate crystals

Cited by 26 publications

References 11 publications

Highly sensitive absorption measurements in lithium niobate using whispering gallery resonators

Highly sensitive absorption measurements in lithium niobate using whispering gallery resonators

Room-Temperature Continuous-Wave Frequency-Referenced Spectrometer up to 7.5 THz

Comparative study on three highly sensitive absorption measurement techniques characterizing lithium niobate over its entire transparent spectral range

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