Efficient stimulated anti-Stokes Raman scattering has been observed in silica microspherical resonators pumped by CW laser. This process is observed in the normal dispersion regime. The lack of correlation between stimulated anti-Stokes and Stokes scattering spectra indicates that the signal has to be resonant with the cavity.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.39.005993 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Spectroscopic study of energy transfer in collisions between vibrational excited H2 and CO2.
J Chem Phys
December 2024
Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830017, China.
The collisional energy transfer between vibrational excited H2(1, 7) and CO2 was investigated by exciting H2 to a vibrational excited state of v = 1, J = 7 by the stimulated Raman scattering technique. The coherent anti-Stokes Raman spectroscopy (CARS) technique determined that H2 was excited to the H2(1, 7) state. Varying the cuvette temperature, the number of H2(1, 7) particles was found to increase with the increase in H2 molar ratio α by scanning the intensity of the CARS spectrum, with peaks at different α at a temperature of 363 ± 15 K, but the peak temperature was not sensitive to α.
View Article and Find Full Text PDFMultiple coherent radiations are achieved in a water-3-aminopropanol (3AP) mixed solution through cascaded four-wave mixing (C-FWM) and cascaded Stokes (C-Stokes) processes, both driven by stimulated Raman scattering (SRS) in this work. The O-H vibration peak from water is replaced by the emergence of the -NH symmetric stretching Raman peaks from 3AP, with intensity approaching that of the -CH symmetric stretching peak. The dual-wavelength SRS signals for the -NH and -CH stretching vibrations have a relatively small frequency interval of about 400 cm (16 nm).
View Article and Find Full Text PDFWe present a scalar, time-dependent, plane-wave model for stimulated Brillouin scattering (SBS) within a fiber amplifier having a seed linewidth comparable to, or greater than, the Brillouin frequency shift. The broadband model introduces the existence of a backward anti-Stokes wave, in addition to the Stokes wave present in the narrowband model. The model also incorporates a Fresnel reflection within the fiber or at the exit face.
View Article and Find Full Text PDFInsights into pharmaceutical co-crystallization using coherent Raman microscopy.
J Pharm Sci
January 2025
Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Viikinkaari 5E, 00790 Helsinki, Finland. Electronic address:
Article Synopsis
- This study focuses on the process of creating co-crystals of active pharmaceutical ingredients (APIs) and highlights the importance of understanding co-crystallization behaviors under different conditions.
- The researchers utilized two advanced imaging techniques, narrowband CARS and hyperspectral SRS, to observe co-crystallization in real-time, revealing key differences in component identification and overall co-crystal formation.
- The findings provide new insights into the co-crystallization process, including unexpected trace forms and the influence of ethanol content on co-crystal stability during milling.
Advancing cerumen analysis: exploring innovative vibrational spectroscopy techniques with respect to their potential as new point-of-care diagnostic tools.
Analyst
November 2024
Institute of Physical Chemistry (IPC) and Abbe Center of Photonics (ACP), Friedrich Schiller University Jena, Member of the Leibniz Centre for Photonics in Infection Research (LPI), Helmholtzweg 4, 07743 Jena, Germany.
Article Synopsis
- Cerumen, or earwax, is made up of secretions from ceruminous glands, primarily consisting of lipids and proteins, but its diagnostic potential is largely untapped.
- * Researchers utilized several advanced vibrational spectroscopy techniques, like Raman and optical photothermal infrared (OPTIR) spectroscopy, to analyze cerumen and identify its main components.
- * The study highlights how these modern methods can enhance the detection of important molecular details in cerumen, potentially leading to new diagnostic tools and treatments in healthcare.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!