Masamori Endo et al 2001 J. Phys. D: Appl. Phys. 34 68 doi:10.1088/0022-3727/34/1/312
Masamori Endo1, Shigeru Yamaguchi1, Taro Uchiyama2 and Tomoo Fujioka1
Show affiliationsThe numerical simulation of the optical resonator for a coaxial slab CO2 laser is conducted. The resonator consists of a toric mirror, a w-axicon, and a plane output coupler. To hold the two slabs coaxially, struts exist in the annular gap region. The effects of the struts on the output power and beam quality for the given resonator are discussed. It is found that varying the vertex of the toric mirror can control the oscillation mode between the E00 fundamental mode and the E01 first azimuthal mode. It is revealed that the resonator loss of the fundamental mode can be smaller than the first azimuthal mode by shifting the vertex inward, and this results in single-mode oscillation at the E00 fundamental mode. On the other hand, the maximum output is obtained under conditions where the resonator oscillates at the E01 mode, because the nodes of the mode coincide with the position of the struts. Loss measurement of each eigenmode well describes the aforementioned phenomena.
42.55.Lt Gas lasers including excimer and metal-vapor lasers
42.79.Gn Optical waveguides and couplers
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.79.Bh Lenses, prisms and mirrors
Issue 1 (7 January 2001)
Received 27 April 2000
Masamori Endo et al 2001 J. Phys. D: Appl. Phys. 34 68
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