+ Dr. Jeff Balla + Dr. Greg Herring
		Publication List: Dr. Herring + Download

Stimulated Raman Scattering (SRS)

• No seeding required – laser directly detects N2 molecules in Air
  
  
• Two versions:
  
  1. Stimulated Raman Gain Spectroscopy (SRGS) – present method
  
  2. Inverse Raman Spectroscopy (IRS)

SRGS Summary:

What is SRGS?

• Nonintrusive laser-based flow diagnostic
• Close cousin of CARS
• Based on Doppler shifts and Raman line- shape analysis

What does SRGS do?

• Measures velocity, static pressure, & translational temperature -simultaneously from same sample volume
• ~ 1-cm resolution

Energy Level Diagrams for Spontaneous Raman and Four Stimulated-Raman Interactions

Schematic of Spontaneous & Crossed-Beam Geometry for Four Stimulated Raman Processes