Femtosecond pulse shaper built into a prism compressor

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Acousto-optic modulators (AOMs) are widely used for spectral filtering.
• Traditional pulse shapers often employ gratings, which can be inefficient and introduce dispersion.

Purpose of the Study:

• To develop a novel frequency-domain pulse shaper utilizing Brewster prisms.
• To enhance the efficiency and dispersion compensation capabilities of AOM-based pulse shapers.

Main Methods:

• Implemented a pulse shaper employing Brewster prisms instead of gratings.
• Tested the device across wavelength ranges of 520-660 nm and 840-1170 nm.
• Utilized the shaper to generate sub-50 femtosecond pulses.

Main Results:

• Achieved a three-fold increase in efficiency compared to grating-based systems.
• Successfully compensated for temporal dispersion introduced by the AOM.
• Generated ultrashort pulses (sub-50 fs) in the tested wavelength bands.

Conclusions:

• The Brewster prism-based AOM pulse shaper offers significant efficiency gains.
• This technology enables effective dispersion compensation for ultrashort pulse generation.
• The shaper was successfully applied to characterize semiconducting carbon nanotubes via 2D white-light spectroscopy.