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Axicon based conical resonators with high power copper vapor laser

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4 Author(s)
Singh, Bijendra ; Laser System Engineering Division, Raja Ramanna Center for Advanced Technology, Indore 452013, India ; Subramaniam, V.V. ; Daultabad, S.R. ; Chakraborty, Ashim

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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.

Published in:

Review of Scientific Instruments  (Volume:81 ,  Issue: 7 )