Abstract:
In this research, the Macleod software which meet the requirements
of the most sophisticated designer and the fastest solution of various
i
design problems was used to design and
analyze
the optical
specifications of multilayered (thin films ) that can be used as resonator
for Nd-YAG Laser (1064 nm). The different film optical filters were
used to control the transmittance and reflectance. Different samples of
dielectric materials composed of HgS / Na3AlF6, HgS / MgF2, CdS/
Na3AlF6, CdS/ MgF2, ZnS/MgF2 and ZnS/Na3AlF6 and oxide materials
of ZnO/ Na3AlF6, ZnO/ MgF2, HfO2/ Y2O3, TiO2 / Y2O3, SiO2 / Y2O3,
Sc2O3 / MgO, Al2O3 /SiO2,T iO2 /SiO2,Ta2O5/SiO2, ZrO2/SiO2 and Ta2O5
/TiO2 were used and compared with each other in transmittance,
reflectance, physical thickness, optical thickness, geometric thickness,
full width at half maximum ( FWHM ) and incidence angle by the
Macleod software. It was found that the dielectric material ZnS+ Na3AlF6
with 2007.47 nm physical thickness and 2.50000/1.38030 refractive
index at range of 875- 1000 nm was the best in transmittances,
reflectance, physical thickness, optical thickness, geometric thickness,
full width at half maximum (FWHM) and incidence angle compared
to other materials so it is suitable as an output coupler with high
transmittance of 95.74% for
Also the
Nd :YAG ( 1064 nm ) Laser.
dielectric materials (Ta2O5 / TiO2 ) with 8697.78 nm
physical thickness and 2.10000/2.2500 refractive index at wavelength
range of
800 -2000 nm
was the best
ii
in all characteristics for
transmittances, reflectance, physical thicknesses, optical thickness,
geometric thickness, full width at half maximum (FWHM) and
incidence angle compared with other materials. So it is suitable as
a back mirror with high reflectance of 98.91 % for Nd:YAG (1094
nm) Laser. For more improvement, Ta2O5/TiO2
glass substrate was
replaced by Ag substrate. It was found that with Ag substrate the change
in reflectivity (%) was very simple with the change in the incidence
angles. Also the number of layers and the thickness of the sample
were less than the glass substrate . Therefore, Ag substrate was much
better than the glass substrate and is recommended for
use in Laser
mirrors. Thus the major obstacle for improving the output of high-
power Nd:YAG laser systems is resolved. Among the chosen materials,
one can conclude that a resonator can be fabricated from Ta2O3/TiO2 with
66 Layers as back mirror
and of ZnS+ Na3AlF6 with 13 layers as anoutput coupler
