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A thorough analysis of the shape and strength of Doppler-broadened wavelength-modulated noise-immune cavity-enhanced optical heterodyne molecular spectroscopy signals is presented, and their dependence on modulation frequency, modulation amplitude, and detection phase is investigated in detail. The conditions that maximize the on-resonance signal are identified. The analysis is based on standard frequency modulation spectroscopy formalism and the Fourier description of wavelength modulation spectroscopy and is verified by fits to experimental signals from C2H2 and CO2 measured at 1531 nm. In addition, the line strengths of two CO2 transitions in the ν2→3ν1+ν2+ν3 hot band [Pe(7) and Pe(9)] were found to differ by ~20% from those given in the HITRAN database.
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Foltynowicz et al. (2009) studied this question.
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