The technology
Hybrid fs/ps CARS diagnostics.
Coherent Anti-Stokes Raman Spectroscopy (CARS) is the gold-standard non-intrusive technique for measuring temperature and species in reacting and high-energy flows. Our hybrid femtosecond/picosecond implementation pushes it further — faster, brighter, and quantitative.
How it works
- 01 A femtosecond pump and Stokes pulse pair coherently excite molecular vibrations.
- 02 A time-delayed picosecond probe scatters off the prepared coherence.
- 03 The anti-Stokes signal is collected and spectrally resolved single-shot.
- 04 Spectral fitting yields temperature and species concentration directly.
Why hybrid fs/ps
Suppressed background
Picosecond probe delay rejects non-resonant background, leaving a clean resonant signal.
Single-shot at 1 kHz+
Each laser shot yields a full spectrum — capturing turbulent dynamics in real time.
Sub-millimeter probe volume
Localized measurements with no probe interference in the flow.
Calibration-free
Quantitative output from first principles, traceable to molecular physics.
Broad species coverage
H₂, N₂, O₂, CO, CO₂, CH₄ and other Raman-active molecules.
20 K to 3000 K+
From cryogenic propellants to detonations — one platform.
Repetition rate
1 – 5 kHz
Probe volume
~100 μm × 1 mm
Temperature range
20 – 3000 K
Precision
< 1 %