Study of resonator properties of stable and unstable lasers

الملخص EN

In this work, the stability of optical resonator for two types of lasers are studied which are, He-Ne laser and CO2 laser.

The first type, is a low power laser and 0.6328 μm of wave length and the second type (CO2 laser) is a high power laser and 10.6 μm of wave length .

Theoretical part deals with illustrating the physical meaning of stability factors which are g-factor, Fresnel No.

, Q-factor and diffraction losses , also the mathematical equations of these factors and the geometrical specifications related with optical resonator.

According to the figures which show the relationships between the stability factors, He-Ne laser is more stable than CO2 laser ; it has been verified and this is due to the high difference of photon ,s energy and also to the difference in output powers for the two laser.