Abstract:
This work was devoted to design and construct a tunable copper vapor
laser system and to select a single wavelength each time, using a
volume holographic diffraction grating.
Also the work aim to the study of the effect of the discharge current
and pressure inside the laser cavity on the laser lines intensity.
The tuning was accomplished by the rotation of the grating thus
changing the angle of incidence of the laser on the grating and so the
amplification exclusively had done for specific wavelength according'
to Bragg law.
The results showed that different laser wavelengths were recorded and
tuned like 726.47, 665.04, 603.60, 588.07, 558.59, 516.14, 481.61
and 447.84nm, one wavelength each time.
To use the constructed Copper laser, the green and violet lines (516.14,
481.61 run respectively) were used to study the photo-reduction of phenol
in water. The photocatalysis used here to provide electron-hole pair to
attack the phenol molecules, The activity of semiconductors (ZnO and
Ah03) catalyst for photo-degradation of phenol has been investigated, the
dependence of phenol degradation on laser irradiation time, catalyst
concentration was also investigated.
Phenol degradation was achieved and it was affected positively by
exposure time, amount of the catalyst and negatively by the laser
wavelength.
