Mr. Yu Miyawaki Profile

Yu Miyawaki

at Univ of Tokyo

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Proceedings Article | 9 March 2022 Presentation

Stimulated Raman scattering spectroscopy with quantum-enhanced balanced detection scheme

Kenichi Oguchi, Zicong Xu, Yoshitaka Taguchi, Yuki Sano, Yu Miyawaki, Kazuhiro Katoh, Yasuyuki Ozeki

Proceedings Volume PC12016, PC120163D (2022) https://doi.org/10.1117/12.2608735

KEYWORDS: Spectroscopy, Raman spectroscopy, Raman scattering, Signal to noise ratio, Imaging spectroscopy, Molecular spectroscopy, Laser scanners, 3D scanning, Waveguides, Picosecond phenomena

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Quantum-enhanced stimulated Raman scattering (QE-SRS) becomes a powerful method for high-sensitivity molecular vibrational spectroscopy and imaging by breaking the shot-noise-limited sensitivity of classical SRS. However, it’s still challenging to achieve quantum-enhancement with typical pulse power (<10-mW) for SRS. Although amplitude-squeezing technique was utilized in the previous QE-SRS, it limits the available optical power by its deamplification or optical loss at asymmetric beamsplitter. To circumvent this problem, we propose and demonstrate SRS spectroscopy with quantum-enhanced balanced detection (QE-BD) scheme, where squeezed vacuum (SQV) is combined with a strong local oscillator (LO) to enhance the sensitivity of SRS. We generated SQV at the central wavelength of 844-nm, using a periodically-poled stoichiometric LiTaO3 waveguide. Picosecond LO light is modulated by a spatial light modulator to achieve spatial matching with SQV , and resultant high squeezing level. At each photodiode, LO has ~10-mW optical power, and –3.1-dB squeezing level was observed. To obtain the QE-SRS spectrum of dimethyl sulfoxide-d6 (d-DMSO), we scanned the wavelength of Stokes laser by a high-speed spectral scanner composed of a grating and galvanometric scanner . The QE-SRS spectrum in the wavenumber range of 1950-2300-cm-1 was acquired with 2.1-dB signal-to-noise ratio (SNR) improvement compared with classical shot-noise-limited SRS under balanced-detection. The proposed QE-BD SRS paves the way for QE-SRS with high-power pulses, and shows a potential to exceed the SNR of state-of-the-art classical SRS system without quantum enhancement

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