Gas slab laser
A microwave excited gas slab laser comprising a waveguide wherein the electrodes are covered with multi-layered stripes either forming a photonic band-gap or having a refractive index lower than 1.
1. An MW excited gas slab laser comprising: a laser head comprising a MW cavity comprising a hollow slab waveguide that includes dielectric layers between which electric discharge in a lasing gas takes place, wherein an optical gain medium formed by said electrical discharge is confined within said hollow slab waveguide, and wherein said dielectric layers form a photonic band-gap structure at a laser gain wavelength, or wherein said dielectric layers have refractive indices lower than 1 at the laser gain wavelength; where the width of the hollow slab between the dielectric layers is equal to or smaller than 0.5 mm; wherein said photonic band gap structure forming the dielectric layers is made of alternating layers of Ge and Al2O3.
2. The laser according to claim 1 , wherein said electric discharge is excited by a high power MW source in the frequency range of 1 GHz-5 GHz.
3. The laser according to claim 2 , where said MW source is a magnetron.
4. The laser according to claim 1 , where the lasing gas within which the electric discharge takes place is a mixture of CO 2 laser made of He, N 2 , CO 2 and Xe.
5. The laser according to claim 1 , where the lasing gas within which the electric discharge takes place, is a mixture of CO laser made of He, N 2 , CO and Xe.
6. The laser according to claim 1 , wherein said dielectric layers comprise Al 2 O 3 .
7. The laser according to claim 1 , wherein said dielectric layers comprise BeO.
8. The laser according to claim 1 , wherein said electric discharge is excited by an MW source, and a stub tuner is provided for impedance matching between the laser head and the MW source.
9. The laser according to claim 1 , wherein said electric discharge is excited by an MW source, and an E-H tuner is provided for impedance matching between the laser head and the MW source.
10. The laser according to claim 1 , wherein said waveguide is comprises within a ridge waveguide.
11. The laser according to claim 10 , wherein the MW energy stored within the said MW cavity is coupled to said electric discharge embedded within said ridge waveguide by a coupling slit between said MW cavity and said ridge waveguide.
12. The laser according to claim 10 , wherein the MW energy stored within the said MW cavity is coupled to said electric discharge embedded within said ridge waveguide, where the said ridge waveguide is comprised within the MW cavity.
13. The laser according to claim 10 , wherein Q-Factor of structure including the MW cavity and the ridge waveguide without laser plasma is higher than Q-Factor of the structure including the MW cavity and the ridge waveguide with laser plasma.
14. The laser according to claim 13 , comprising laser mirrors that form a stable laser cavity configuration.
15. The laser according to claim 13 , comprising laser mirrors that form a hybrid stable and unstable laser cavity configuration, where the stable cavity is formed at a narrow dimension and the unstable cavity is formed at the wide dimension.
16. The laser according to claim 1 , where the laser cavity is formed by laser mirrors placed at both ends of the ridge waveguide, encompassing the said gain medium created by the said electric discharge.
17. The laser according to claim 1 , where the spacing between said dielectric layers is adiabatically tapered up at waveguide ends for avoiding out-coupling losses.