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Total light output and voltage vs applied current for a DFB laser diode with uncoated facets in cw operation at . The inset shows the laser spectrum acquired at an injection current of 165 mA.
Evolution of the DFB laser emission spectrum with increasing cw drive current at . The intensity is presented on a logarithmic scale (dB) in arbitrary units.
Light intensity vs applied current measured after transmission through HF cell. The measurements were made for laser temperatures from 5 to in steps. (Inset) Variation in absorption dip current with laser diode temperature (symbols). The solid line is a guide for the eye.
Absorption spectra with current obtained for laser temperatures 5 to in steps.
TDLAS Absorption spectrum (symbols) obtained for laser temperature of compared with HiTran spectrum calculated for the same HF concentration and path length (solid line).
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