Journal
APPLIED PHYSICS EXPRESS
Volume 14, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.35848/1882-0786/abdef4
Keywords
terahertz; ultrafast measurement; nonlinear optics; coherent detection; infrared spectroscopy; solid state optics
Categories
Funding
- KAKENHI [17K05084, 20K05372]
- MEXT of Japan
- Grants-in-Aid for Scientific Research [20K05372, 17K05084] Funding Source: KAKEN
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Using a biased single crystal of diamond as a nonlinear medium, ultrabroadband infrared pulses generated through two-color pumped air plasma were coherently detected in a spectral range of 1-100 THz. The sensitivity was increased significantly compared to traditional air detection methods, even at higher probe pulse energy levels.
We coherently detected ultrabroadband infrared pulses generated through two-color pumped air plasma produced by hollow-fiber compressed 10 fs pulses in a spectral range of 1-100 THz using a biased single crystal of diamond as a nonlinear medium. The sensitivity was enhanced by two-orders of magnitude compared with the case of air in the probe energy range where saturation did not occur. Even when the probe pulse energy was 100 nJ, the spectral range reached 80 THz. Thus, diamond has reduced the energy of pulses required for realizing broadband coherent detection without sacrificing the advantage of gapless detection.
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