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Our IR emitters are almost exclusively used in chemical analysis. There is a distinction to be made between broadband and narrow-band emitters. Planck’s emitters are broadbanded, whereas IR lasers are narrow banded.
Continuous-wave and pulsable IR emitters are available, both of which are based on metal alloys.
Spectroscopic DFB laser diodes are used in analyzers based on tunable diode laser absorption spectroscopy (TDLAS).