Raman spectroscopy system for measurement of intramolecular vibrational coupling signal

A method comprising:

• producing three or more beams of light, wherein the three or more beams of light have a first pump-Stokes frequency offset Ω1 and a second pump-Stokes frequency offset Ω2 different from the first frequency offset;
• directing the beams of light to a sample, wherein the three or more beams of light are configured to interact with a particular material in the sample via intramolecular vibrational coupling (IVC) to produce an IVC signal at an IVC frequency;
• and
• measuring the IVC signal, comprising:
• producing a probe beam of light at a probe frequency;
• coherently mixing the IVC signal with the probe beam of light to produce a photocurrent signal;
• and
• producing an electronic output signal corresponding to the photocurrent signal.

One or more computer-readable non-transitory storage media embodying software that is operable when executed to:

• produce three or more beams of light, wherein the three or more beams of light have a first pump-Stokes frequency offset Ω1 and a second pump-Stokes frequency offset Ω2 different from the first frequency offset;
• direct the beams of light to a sample, wherein the three or more beams of light are configured to interact with a particular material in the sample via intramolecular vibrational coupling (IVC) to produce an IVC signal at an IVC frequency;
• and
• measure the IVC signal, comprising:
• produce a probe beam of light at a probe frequency;
• coherently mix the IVC signal with the probe beam of light to produce a photocurrent signal;
• and
• produce an electronic output signal corresponding to the photocurrent signal.