Yonggen Xu et al 2009 J. Opt. A: Pure Appl. Opt. 11 125410 doi:10.1088/1464-4258/11/12/125410
Yonggen Xu1, Yude Li, Ting Feng and Yi Qiu
Show affiliationsThe principle of phase-locking of an axisymmetric fold combination cavity CO2 laser, fulfilled by the reflection–injection of the back surface of the output-mirror, has been studied in detail. Variation of the equiphase surface and the influence of some characteristic parameters on phase-locking are analyzed—for example, phase error, changes in the cavity length and curvature radius, line-width and temperature. It is shown that the injected beam can excite a stable mode in the cavities, and the value of the energy coupling coefficient directly reflects the degree of phase-locking. Therefore, the output beams have a fixed phase relation between each other, and good coherent beams can be obtained by using the phase-locking method.
42.55.Lt Gas lasers including excimer and metal-vapor lasers
42.60.Da Resonators, cavities, amplifiers, arrays, and rings
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
Issue 12 (December 2009)
Received 3 May 2009, accepted for publication 8 September 2009
Published 30 September 2009
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