Terahertz Time-Domain Polarimetry for Principal Optical Axes of Anisotropic Crystals

Mamrashev, A. A.; Minakov, Fedor; Nikolaev, Nazar; Анцыгин, В. Д.

doi:10.3390/photonics8060213

Cited by 11 publications

(4 citation statements)

References 33 publications

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“…The refractive index for the extraordinary wave showed more noticeable changes of ~0.08, which were frequency-independent within the measurement accuracy. These temperature changes were quite small in comparison to the LBO crystal, in which the refractive index of the x-axis n x changed by ~0.24 upon cooling [19].…”

Section: Optical Properties In the Thz Rangementioning

confidence: 82%

“…In this study, the experimental setup included two smaller diaphragms with apertures of 5 mm due to the small dimensions of the samples under investigation. Additionally, a newly developed measurement procedure described in [19] was applied. This allowed us to measure the absorption coefficient and the refractive index of the crystals for both ordinary and extraordinary waves during one cryostat cooling cycle (without warming up and changing the position of the sample) under nearly the same conditions.…”

Section: Methodsmentioning

confidence: 99%

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Potential of Sub-THz-Wave Generation in Li2B4O7 Nonlinear Crystal at Room and Cryogenic Temperatures

et al. 2021

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Due to their high optical damage threshold, borate crystals can be used for the efficient nonlinear down-conversion of terawatt laser radiation into the terahertz (THz) frequency range of the electromagnetic spectrum. In this work, we carried out a thorough study of the terahertz optical properties of the lithium tetraborate crystal (Li2B4O7; LB4) at 295 and 77 K. Approximating the terahertz refractive index in the form of Sellmeier’s equations, we assessed the possibility of converting the radiation of widespread high-power laser sources with wavelengths of 1064 and 800 nm, as well as their second and third harmonics, into the THz range. It was found that four out of eight types of three-wave mixing processes are possible. The conditions for collinear phase matching were fulfilled only for the o − e → o type of interaction, while cooling the crystal to 77 K did not practically affect the phase-matching curves. However, a noticeable increase of birefringence in the THz range with cooling (from 0.12 to 0.16) led to an increase in the coherence length for o − o → e and e − e → e types of interaction, which are potentially attractive for the down-conversion of ultrashort laser pulses.

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Section: Optical Properties In the Thz Rangementioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Potential of Sub-THz-Wave Generation in Li2B4O7 Nonlinear Crystal at Room and Cryogenic Temperatures

et al. 2021

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“…It allows us to find the minimum transmission at different frequencies and estimate the relative dispersion of the angle between the crystallographic and dielectric axes. High-performance polarizers (aluminum grid on polypropylene film) with an extinction ratio of more than 40 dB were used in our setup [2].…”

Section: Terahertz Frequency-domain Spectroscopy Of the Samplesmentioning

confidence: 99%

Characterization of the new semiorganic nonlinear crystal of guanylurea hydrogen phosphite in the terahertz range

Nikolaev,

Sinko,

Bychkova

et al. 2023

Infrared, Millimeter-Wave, and Terahertz Technologies X

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Recently, the semiorganic crystal of guanylurea hydrogen phosphite was revealed as an extremely efficient narrow-band terahertz radiation source. It is proposed that the emission is closely connected with the excitement of high-quality phonon oscillations, which in turn necessitates a detailed characterization of the optical properties of the crystal in this range. The extreme dispersion of the angle between dielectric and crystallographic coordinates, permitted by the monoclinic syngony of the crystal, was estimated to be 2.3° per 100 GHz. The dielectric susceptibility of the crystal measured by means of time-domain spectroscopy is determined by the high-Q phonon at 1.45 THz for ETHz||x, which is responsible for the efficient terahertz generation. Also, two modes were found at 1.02 and 0.92 THz for ETHz||z and ETHz||y, respectively. All three components of the refractive index were measured in the range of 0.4–2 THz. We believe that modification of the crystal structure will allow tuning the characteristics of the narrowband terahertz source based on it.

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“…The optical properties of two principal dielectric axes of the BIBO samples were measured without rotating and replacing the sample, following the procedure described in [37]. According to this technique, the sample understudy was installed at an approximately 45 • angle relative to the initial polarization of the THz field.…”

Section: Temperature-dependent Thz Polarimetrymentioning

confidence: 99%

Temperature-Dependent Optical Properties of Bismuth Triborate Crystal in the Terahertz Range: Simulation of Terahertz Generation by Collinear Three-Wave Mixing in the Main Crystal Planes

Ezhov,

Nikolaev,

Antsygin

et al. 2023

Photonics

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Terahertz (THz) frequency generation via nonlinear optical techniques is of particular interest due to the immense potential of this type of radiation in various scientific fields, ranging from medicine to telecommunications. Selecting suitable nonlinear media for laser frequency down-conversion presents a challenging task. Considering an approach that uses nonlinear crystals with high radiation resistance, pumped by intense laser pulses near their damage threshold, we suggest the crystal of bismuth triborate (BiB3O6, BIBO). Compared to other borate-class crystals, BIBO exhibits relatively high coefficients of quadratic susceptibility. In this paper, we have studied the optical properties of BIBO samples in a wide spectral range from 0.1 to 2.1 THz at temperatures of 473, 383, 295, and 77 K using Terahertz Time-Domain Spectroscopy (THz-TDS). Furthermore, we simulated collinear three-wave interactions with nonzero efficiency for difference frequency generation (DFG) in the THz range. For the pump wavelengths of about 800 nm, we determined phase-matching (PM) conditions and compared the generation efficiency for different crystal cuts. The potential of utilizing BIBO crystal for terahertz frequency generation is discussed.

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Terahertz Time-Domain Polarimetry for Principal Optical Axes of Anisotropic Crystals

Cited by 11 publications

References 33 publications

Potential of Sub-THz-Wave Generation in Li2B4O7 Nonlinear Crystal at Room and Cryogenic Temperatures

Potential of Sub-THz-Wave Generation in Li2B4O7 Nonlinear Crystal at Room and Cryogenic Temperatures

Characterization of the new semiorganic nonlinear crystal of guanylurea hydrogen phosphite in the terahertz range

Temperature-Dependent Optical Properties of Bismuth Triborate Crystal in the Terahertz Range: Simulation of Terahertz Generation by Collinear Three-Wave Mixing in the Main Crystal Planes

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