Title :
Modes of resonators with conical reflectors
Author :
Parkhomenko, Yurij N. ; Spektor, Boris ; Shamir, Joseph
Author_Institution :
Dept. of Electr. Eng., Technion - Israel Inst. of Technol., Haifa, Israel
Abstract :
Shaping of the oscillating mode within a laser resonator is useful for generation of special beam structures for applications such as metrology, particle manipulation, lithography, and energy delivery. It can also increase the power efficiency of the laser. Here we numerically study laser mode structures imposed by replacing one resonator mirror with a conical reflector. In the region with positive cone angles, the resonator radiates a flat top mode with enlarged mode volume inside the cavity that is capable to increase the power efficiency of the laser by a factor of 4-5. Pure oscillation on two azimuth modes can be obtained with a conical reflector of negative angle. Laser beams from such resonators are applicable for singular beam metrology and particle manipulation. Optimal parameters for generating these modes are derived. The best performance can be obtained in resonators with a configuration close to concentric.
Keywords :
laser beams; laser cavity resonators; laser mirrors; laser modes; azimuth modes; conical reflectors; laser beam structures; laser mode structures; laser oscillation modes; laser power efficiency; laser resonator mirror; particle manipulation; positive cone angles; singular beam metrology; Azimuth; Chromium; Equations; Laser beams; Laser modes; Lithography; Metrology; Mirrors; Particle beams; Power lasers; beam shaping; conical reflector; laser resonator; mode selection;
Conference_Titel :
Electrical and Electronics Engineers in Israel, 2008. IEEEI 2008. IEEE 25th Convention of
Conference_Location :
Eilat
Print_ISBN :
978-1-4244-2481-8
Electronic_ISBN :
978-1-4244-2482-5
DOI :
10.1109/EEEI.2008.4736713
