Ultrafast waveform synthesis and characterization using coherent Raman sidebands in a reflection scheme

Area of Science:

• Ultrafast optics
• Nonlinear spectroscopy

Background:

• Coherent Raman sidebands are generated by nonlinear interaction of multi-color femtosecond laser pulses in Raman-active media.
• These sidebands hold potential for creating single-cycle pulses, crucial for ultrafast waveform synthesis.

Purpose of the Study:

• To develop a method for generating and controlling coherent Raman sidebands.
• To demonstrate the synthesis of ultrafast waveforms using these sidebands.

Main Methods:

• Two-color femtosecond laser pulses were crossed in a Raman-active crystal to generate coherent Raman sidebands.
• A reflection scheme with spherical mirrors was employed to combine the generated sidebands.
• Spectral phases were retrieved using an interferogram based on nonlinear Raman interaction.
• A deformable mirror was used to actively adjust spectral phases.

Main Results:

• Coherent Raman sidebands were successfully generated and combined.
• Relative spectral phases were retrieved from interferograms.
• The setup demonstrated the capability of synthesizing ultrafast waveforms by manipulating spectral phases.

Conclusions:

• The developed reflection scheme effectively combines coherent Raman sidebands.
• Active control over spectral phases enables the synthesis of tailored ultrafast waveforms.
• This technique offers a promising route towards generating single-cycle pulses and advancing ultrafast optics.