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Multiwavelength highly transient stimulated Raman scattering on dual Raman modes in Sr(MoO4)0.8(WO4)0.2 and
Optics Letters
|October 1, 2024
Summary
This study investigates multicolor two-photon imaging using stimulated Raman scattering (SRS) in novel solid solutions. Optimized chirped pulse durations enhance SRS efficiency for biological tissue imaging.
Area of Science:
- Nonlinear Optics
- Materials Science
- Biomedical Imaging
Background:
- Stimulated Raman scattering (SRS) is crucial for molecular imaging.
- Developing efficient SRS sources in the biological transparency window (1000-1300 nm) is essential for in vivo imaging.
- Strontium molybdate (SrMoO4) and tungstate (SrWO4) solid solutions offer tunable optical properties.
Purpose of the Study:
- To comparatively investigate multiwavelength SRS in Sr(MoO4)0.8(WO4)0.2 and Sr(MoO4)0.4(WO4)0.6 solid solutions.
- To optimize SRS conversion efficiency for multicolor two-photon imaging of living tissues.
- To explore the effect of chirped pulse durations and negative chirp on SRS generation.
Main Methods:
- Ultrafast chirped pulse laser pumping.
- Single-pass stimulated Raman scattering.
- Investigation of dual Raman modes (stretching and bending).
- Analysis of SRS conversion efficiency across a range of pump pulse durations (0.25-5 ps).
Main Results:
- Wider optimal chirped pump pulse duration range (1-5 ps) for solid solutions compared to SrMoO4.
- Higher SRS conversion efficiency achieved with negative chirp compensation, reaching up to 49% for Sr(MoO4)0.4(WO4)0.6.
- Generation of up to five Stokes components within the 1000-1300 nm biological transparency window.
- Sr(MoO4)0.4(WO4)0.6 demonstrated superior performance due to comparable Raman mode intensities.
Conclusions:
- The investigated Sr(MoO4)-SrWO4 solid solutions are promising for efficient multiwavelength SRS generation.
- Optimized chirped pulse SRS offers a viable route for multicolor two-photon imaging in living tissues.
- Negative chirp plays a critical role in enhancing SRS efficiency in these materials.
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