Efficient Broadband Terahertz Generation from Organic Crystal BNA Using Near Infrared Pump

Zhao, Hang; Wu, Tong; Tan, Yong; Steinfeld, Gunther; Zhang, Yan; Zhang, Cunlin; zhang, Liangliang; Shalaby, Mostafa

doi:10.1109/irmmw-thz.2019.8873868

Cited by 7 publications

(14 citation statements)

References 23 publications

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“…Crystalline N-benzyl-2-methyl-4-nitroaniline (BNA) is another interesting molecular crystal because it features weaker phonon absorptions in the THz region (compared to DAST, DSTMS, and OH1). Initially designed to improve the crystallization behavior of NLO MNA crystals, BNA has been tested for THz generation [6,7]. THz pulses with spectral content from 0 to 3 THz were obtained via optical rectification using an 800-nm pump wavelength; however, ZnTe was used as an electro-optic (EO) detection crystal, which may have unnecessarily limited the detection bandwidth [6].…”

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confidence: 99%

Comprehensive characterization of terahertz generation with the organic crystal BNA

et al. 2021

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We characterize the THz generation of N-benzyl-2-methyl-4-nitroaniline (BNA), with crystals ranging in thickness from 123-700 μm. We compare excitation using 1250-1500-nm and 800-nm wavelengths. Pumping BNA with both 800-nm wavelengths and longer near-infrared wavelengths results in a broad spectrum, producing out to 6 THz using a 100-fs pump, provided the BNA sample is thin enough. ~200 μm or thinner crystals are required to produce a broad spectrum with an 800-nm pump, whereas ~300 μm crystals are optimal for broadband THz generation using the longer wavelengths. We report the favorable THz generation and optical characteristics of our BNA crystals that make them attractive for broadband, highfield THz generation, and we also find significant differences to BNA results reported in other works.

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confidence: 99%

Comprehensive characterization of terahertz generation with the organic crystal BNA

et al. 2021

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“…The detected bandwidth spans up to 6 THz with a large dynamic range of >50 dB. In previously published work using BNA pumped with 800 nm [26] and with wavelengths between 1150 nm and 1500 nm [22,26] a significant dip in the THz spectrum was observed at 2 THz. This effect is greatly reduced in this work due to the different phase matching situation caused by different pumping wavelengths of 1030 nm which results in a broader, smooth THz spectrum from 0 to 6 THz.…”

Section: Highest Thz Average Power With Diamond-heatsinked Bnamentioning

confidence: 84%

“…Using a 800 nm pump wavelength and an adjustable repetition rate between 10 Hz to 100 Hz [21], an optical-to-THz conversion efficiency of 0.2% with peak to peak electric field of ~4 MV/cm has been obtained. In [22], a 1150-1550 nm near infrared pump at moderate repetition rate of 1 kHz was used to achieve a high optical-to-THz conversion efficiency of 0.8% and record strong fields of 10 MV/cm. However, the THz generation properties of BNA crystal and its potential to generate high average power THz radiation in MHz repetition rate range at 1030 nm driving wavelength were so far still unknown.…”

Section: Introductionmentioning

confidence: 99%

Milliwatt average power, MHz-repetition rate, broadband THz generation in organic crystal BNA with diamond substrate

Mansourzadeh

Vogel

Shalaby³

et al. 2021

Opt. Express

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We demonstrate a 13.3 MHz repetition rate, broadband THz source with milliwattaverage power, obtained by collinear optical rectification of a high-power Yb-doped thin-disk laser in the organic crystal BNA (N-benzyl-2-methyl-4-nitroaniline). Our source reaches a maximum THz average power of 0.95 mW with an optical-to-THz efficiency of 4×10 -4 and a spectral bandwidth spanning up to 6 THz at -50 dB, driven by 2.4 W average power (after an optical chopper with duty cycle of 10%), 85 fs-pulses. This high average power excitation was possible without damaging the crystal by using a diamond-heatsinked crystal with significantly improved thermal properties. To the best of our knowledge, this result represents the highest THz average power reported so far using the commercially available organic crystal BNA, showing the potential of these crystals for high average power, high repetition rate femtosecond excitation. The combination of high power, high dynamic range, high repetition rate and broadband spectrum makes the demonstrated THz source highly attractive to improve various time-domain spectroscopy applications. Furthermore, we present a first exploration of the thermal behavior of BNA in this excitation regime, showing that thermal effects are the main limitation in average power scaling in these crystals.

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“…The bandwidth is less than 1 THz and the maximum pulse energy is 1.9 mJ, resulting in a peak electric field of 3.7 MV/cm [55]. Pumped with 1150-1550 nm infrared pules, the BNA crystal can generate THz pules with a spectrum extending up to 7 THz and a peak electric field of 10 MV/cm [56].…”

Section: Optical Rectificationmentioning

confidence: 99%

Intense terahertz radiation: generation and application

Zhang

Zhao

2020

Front. Optoelectron.

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Strong terahertz (THz) radiation provides a powerful tool to manipulate and control complex condensed matter systems. This review provides an overview of progress in the generation, detection, and applications of intense THz radiation. The tabletop intense THz sources based on Ti:sapphire laser are reviewed, including photoconductive antennas (PCAs), optical rectification sources, plasma-based THz sources, and some novel techniques for THz generations, such as topological insulators, spintronic materials, and metasurfaces. The coherent THz detection methods are summarized, and their limitations for intense THz detection are analyzed. Applications of intense THz radiation are introduced, including applications in spectroscopy detection, nonlinear effects, and switching of coherent magnons. The review is concluded with a short perspective on the generation and applications of intense THz radiation.

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Efficient Broadband Terahertz Generation from Organic Crystal BNA Using Near Infrared Pump

Cited by 7 publications

References 23 publications

Comprehensive characterization of terahertz generation with the organic crystal BNA

Comprehensive characterization of terahertz generation with the organic crystal BNA

Milliwatt average power, MHz-repetition rate, broadband THz generation in organic crystal BNA with diamond substrate

Intense terahertz radiation: generation and application

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