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Updated: Oct 2, 2025

Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
Published on: July 25, 2022
Multipass spectral broadening and compression in the green spectral range
Researchers demonstrate efficient multipass spectral broadening and pulse compression around 515 nm. This technique achieves ultrashort pulse generation down to 38 fs using bulk or gaseous media, paving the way for UV applications.
Area of Science:
- Nonlinear Optics
- Ultrafast Lasers
- Spectral Broadening
Background:
- Ultrashort pulse generation is crucial for various scientific applications.
- Existing methods for spectral broadening and pulse compression have limitations.
Purpose of the Study:
- To experimentally demonstrate multipass spectral broadening and pulse compression around 515 nm.
- To achieve efficient generation of ultrashort pulses using nonlinear multipass cells.
Main Methods:
- Utilizing a nonlinear multipass cell with bulk media for pulse compression.
- Employing a multipass cell with gaseous media for bandwidth generation.
- Implementing dispersion management through cell size and nonlinear medium thickness reduction.
Main Results:
- Compressed 250-fs pulses down to 38 fs using bulk media.
- Generated sufficient bandwidth for sub-20-fs pulse generation using gaseous media.
- Achieved over 85% efficiency in both bulk and gaseous media configurations.
Conclusions:
- Multipass spectral broadening and compression are efficient methods for generating ultrashort visible pulses.
- Dispersion management is key to efficient ultrashort pulse generation in the visible range.
- This approach provides a pathway for ultraviolet spectral broadening using multipass cells.
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