Operating characteristics of a tunable diode laser absorption spectrometer using short-external-cavity and DFB laser diodes.

Second harmonic detection at audio frequencies of isolated absorption lines with a laser absorption spectrometer employing AlGaAs and InGaAsP diode lasers, short external cavity (SXC) AlGaAs and InGaAsP diode lasers, and InGaAsP distributed feedback (DFB) diode lasers was investigated and compared. Noise levels equivalent to line center absorptions of ~3 x 10(-6) were achieved with each source. Single mode tuning ranges of 20-50 cm(-1) were …