High beam quality in a HyBrID copper laser operating with an unstable resonator made of a concave mirror and a plano-convex BK7 lens

This paper presents a very simple unstable resonator, made of a concave mirror (total reflector) and a bare plane–convex BK7 lens working as a convex coupling mirror, which is quite efficient for HyBrID copper laser. In addition to a good quality factor ( M 2 = 4.9 ) , experimental results showed th...

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Bibliographic Details
Published in:Optics and laser technology 2006-10, Vol.38 (7), p.523-527
Main Authors: Gião, Madalena Alice Priante, Miyakawa, Walter, Rodrigues, Nicolau André Silveira, Maria Zezell, Denise, Riva, Rudimar, Geraldo Destro, Marcelo, Tsutomu Watanuki, Jaime, Schwab, Carlos
Format: Article
Language:English
Subjects:
Beam characteristics: profile, intensity, and power
spatial pattern formation
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
HyBrID copper laser
Laser beam quality
Laser optical systems: design and operation
Lenses, prisms, and mirrors
Optical elements, devices, and systems
Optics
Physics
Reflectors, beam splitters, and deflectors
Unstable resonator
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Summary:This paper presents a very simple unstable resonator, made of a concave mirror (total reflector) and a bare plane–convex BK7 lens working as a convex coupling mirror, which is quite efficient for HyBrID copper laser. In addition to a good quality factor ( M 2 = 4.9 ) , experimental results showed that it is possible to control the laser output power by introducing a variable aperture iris inside the cavity, close to the coupling lens, without spoiling beam quality. A rough theoretical model helped to explain these results as a combined effect of unstable resonator plus radial gain distribution.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2004.11.025