Under the enlighten of experimental results, we found that the transverse feedback from the side wall of sample tube played an important role in the miniature OPFIRL. A new theoretical model of OPFIRL including transverse feedback was proposed. By using new model, the calculated optimum operating gas pressure was in good agreement with experimental value as shown in Fig.10. Sets of theoretical curves for the design of miniature OPFIRL were given.
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Yao Li, "Transverse feedback enhancement in miniature OPFIRI," Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 15145Y (1 December 1990);