| Autor: |
Zicong Xu, Kenichi Oguchi, Yoshitaka Taguchi, Yuki Sano, Yu Miyawaki, Donguk Cheon, Kazuhiro Katoh, Yasuyuki Ozeki |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Optics express. 30(11) |
| ISSN: |
1094-4087 |
| Popis: |
Quantum-enhanced stimulated Raman scattering (QE-SRS) is a promising technique for highly sensitive molecular vibrational imaging and spectroscopy surpassing the shot noise limit. However, the previous demonstrations of QE-SRS utilized rather weak optical power which hinders from competing with the sensitivity of state-of-the-art SRS microscopy and spectroscopy using relatively high-power optical pulses. Here, we demonstrate SRS spectroscopy with quantum-enhanced balanced detection (QE-BD) scheme, which works even when using high-power optical pulses. We used 4-ps pulses to generate pulsed squeezed vacuum at a wavelength of 844 nm with a squeezing level of −3.28 ± 0.12 dB generated from a periodically-poled stoichiometric LiTaO3 waveguide. The squeezed vacuum was introduced to an SRS spectrometer employing a high-speed spectral scanner to acquire QE-SRS spectrum in the wavenumber range of 2000–2280 cm-1 within 50 ms. Using SRS pump pulses with an average power of 11.3 mW, we successfully obtained QE-SRS spectrum whose SNR was better than classical SRS with balanced-detection by 2.27 dB. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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