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Rapid-Tuning Infrared Laser System

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Leland Stanford Junior University Stanford United States

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We have acquired a rapid-wavelength-tunable, continuous-wave, narrow-linewidth external-cavity quantum cascade laser system to enable the measurement of the full fundamental rovibrational absorption band of nitric oxide NO and other mid-infrared active molecular species in high-temperature and high-pressure conditions. We previously were able to measure the fundamental rovibrational bands of NO and other species over only a limited set of wavelengths at moderate wavelength-tuning rates the acquisition of this laser system will now enable the creation of a comprehensive high-temperature and high-pressure spectral database that will increase the range of applicability of NO absorption sensing to infer the temperature of high-enthalpy flows in ground-test facilities used to evaluate new propulsion concepts. This equipment will also be used in the training and education of the next generation of graduate students in mechanical engineering in the areas of interest to the Air Force hypersonics, laser diagnostics, and shock tube methods.

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Technical Report,15 Jun 2018,14 Jun 2019



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Approved For Public Release;

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