High beam quality in a HyBrID copper laser operating with an unstable resonator made of a concave mirror and a plano-convex BK7 lens
✍ Scribed by Madalena Alice Priante Gião; Walter Miyakawa; Nicolau André Silveira Rodrigues; Denise Maria Zezell; Rudimar Riva; Marcelo Geraldo Destro; Jaime Tsutomu Watanuki; Carlos Schwab
- Publisher
- Elsevier Science
- Year
- 2006
- Tongue
- English
- Weight
- 216 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0030-3992
No coin nor oath required. For personal study only.
✦ Synopsis
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 ðM 2 ¼ 4:9Þ; 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.