Axicon based conical resonators with high power copper vapor laser

Singh, Bijendra; Subramaniam, V. V.; Daultabad, S. R.; Chakraborty, Ashim
July 2010
Review of Scientific Instruments;Jul2010, Vol. 81 Issue 7, p073110
Academic Journal
We report for the first time the performance of axicon based conical resonators (ABCRs) in a copper vapor laser, with novel results. The unstable conical resonator comprising of conical mirror (reflecting axicon) with axicon angle ∼π/18, cone angle ∼160°, and a convex mirror of 60 cm radius of curvature was effective in reducing the average beam divergence to ∼0.15 mrad (∼25 fold reduction compared to standard multimode plane-plane cavity) with output power of ∼31 W. Extraction efficiency of ∼50%–60% and beam divergence of <1 mrad was achieved in other stable ABCR configurations using flat and concave mirrors with the axicon. This is a significant improvement compared to 4–5 mrad normally observed in conventional stable resonators in copper vapor lasers. The conical resonators with copper vapor laser provide high misalignment tolerance β∼4–5 mrad where β is the tilt angle of the conical mirror from optimum position responsible for ∼20% decline in laser power. The depth of focus d was ∼three times larger in case of conical resonator as compared to that of standard spherical unstable resonator under similar beam divergence and focusing conditions.


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