Multiwavelength diode-laser absorption spectroscopy using external intensity modulation by semiconductor optical amplifiers.

@article{Karagiannopoulos2012MultiwavelengthDA,
  title={Multiwavelength diode-laser absorption spectroscopy using external intensity modulation by semiconductor optical amplifiers.},
  author={Solon Karagiannopoulos and Edward M Cheadle and Paul Wright and Stylianos Tsekenis and Hugh McCann},
  journal={Applied optics},
  year={2012},
  volume={51 34},
  pages={8057-67}
}
A novel opto-electronic scheme for line-of-sight Near-IR gas absorption measurement based on direct absorption spectroscopy (DAS) is reported. A diode-laser-based, multiwavelength system is designed for future application in nonintrusive, high temporal resolution tomographic imaging of H2O in internal combustion engines. DAS is implemented with semiconductor optical amplifiers (SOAs) to enable wavelength multiplexing and to induce external intensity modulation for phase-sensitive detection. Two… CONTINUE READING