A multipoint gas sensing scheme based on photoacoustic spectroscopy was proposed. Multiple photoacoustic spectroscopy (PAS) gas cells (resonant frequency f=5.0  kHz) were connected in series for the multipoint gas sensing with wavelength modulation technique. The PAS signal was excited by modulating the tunable distributed feedback laser diode wavelength at f/2 using a changing driving current. The gas concentration of each gas cell was obtained by the PAS signal, which was demodulated by the lock-in amplifier. A multipoint PAS experiment to detect the water vapor at 1368.597 nm was implemented to verify the scheme we presented. With the three PAS gas cells, the linear response to the water vapor concentration of our sensors achieved 0.9978, 0.99591, and 0.99617, and their minimum detection limits were 479, 662, and 630 ppb, respectively.

Polycrystalline film has been grown on fused silica by pulsed laser deposition at . The wavelength dependence of the transmittance of the film was determined. We first obtained the band gap . Favourable optical waveguiding properties have been demonstrated by observation of sharp m lines from the TE and TM multimodes. The surface and cross sectional morphology of the film was studied by scanning electron microscopy (SEM).