Rapidly Tunable Laser System for NH2 Measurements
Author Information
Author(s): Sean Clees, Spencer C. Barnes, Taylor M. Rault, Christopher L. Strand, Ronald K. Hanson
Primary Institution: Stanford University
Hypothesis
Can a rapidly tunable laser system effectively measure NH2 radicals at 597 nm behind reflected shock waves?
Conclusion
The developed laser system successfully measured NH2 concentrations during NH3 pyrolysis in shock tube experiments.
Supporting Evidence
- The laser system achieved a second-harmonic generation efficiency of 109%/W.
- It demonstrated rapid-tuning capabilities with a scan rate of up to 900 kHz.
- The system maintained optical frequency and power stability within standard deviations of 48 MHz and 0.4% over 20 minutes.
- Measurements were conducted using four different laser absorption spectroscopy techniques.
Takeaway
Scientists built a special laser that can quickly change colors to measure a gas called NH2, which is important for understanding how ammonia breaks down.
Methodology
The system used a distributed feedback diode laser, an optical amplifier, and a periodically poled lithium niobate waveguide for second-harmonic generation.
Limitations
The study was limited to specific temperature and pressure ranges during the shock tube experiments.
Digital Object Identifier (DOI)
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