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Combined wavelength and frequency modulation spectroscopy: a novel diagnostic tool for materials processing.

H C Sun, E A Whittaker, Y W Bae

|August 31, 2010

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A Multimodal Wide-Field Fourier-Transform Raman Microscope

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Area of Science:

Analytical Chemistry
Laser Spectroscopy
Chemical Engineering

Background:

Gas-phase chemical analysis is crucial for industrial processes.
Traditional methods can suffer from interference and limited sensitivity.
Developing robust, high-bandwidth diagnostic tools is essential for real-time monitoring.

Purpose of the Study:

To develop a sensitive, high-bandwidth chemical diagnostic tool for gas-phase environments.
To utilize laser diode modulation techniques for enhanced detection.
To demonstrate the tool's applicability in plasma etching and chemical vapor deposition.

Main Methods:

Applying low-frequency wavelength modulation and high-frequency phase modulation to a laser diode.
Identifying and monitoring specific chemical species via their infrared absorption spectra.
Achieving sensitive detection free from interference fringes.

Main Results:

Demonstrated a sensitive, high-bandwidth chemical diagnostic tool.
Achieved absorbance limits of 5.3 x 10(-8) for AlGaAs diode lasers and 1.9 x 10(-7) for lead-salt diode lasers.
Showcased applicability in environments like plasma etching and chemical vapor deposition.

Conclusions:

The developed laser diode modulation technique offers a sensitive and robust method for gas-phase chemical diagnostics.
The tool effectively minimizes interference, enabling accurate monitoring in complex processing environments.
This technology has significant potential for real-time process control and analysis in various industrial applications.