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Copyright 2008. Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited There are many applications in which...
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... if the modes are coherently coupled, then large intensity oscillations could be expected across the beam. Techniques exist to generate flat-top beams external to the cavity, but this is usually at the expense of energy, and almost always requires very precise input beam parameters. A traditional laser resonator configuration is depicted in Fig. 1. It consists of a gain medium inside an optical cavity which is supplied with energy. Usually the cavity consists of two mirrors aligned such that the light passes through the gain medium several times, while traveling between the two mirrors. One of the two mirrors is made partially transparent, and the laser beam is emitted through ...
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... optical cavity In the case depicted in Fig. 1 the back reflector, which would usually be a spherical curvature mirror, is shown as a non- conventional diffractive optical element (DOE). If the phase profile of this element is chosen so as to differ from spherical curvature, then it is possible to select transverse modes other than the conventional Helmhotz-Gauss and Laguerre-Gauss ...
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... k = 2π/λ is the wavenumber of the laser beam, λ is the wavelength, and ψ(x) and φ(x) are the amplitude and phase of the electric field respectively. The action of a DOE in the form of a phase-only micro-optical mirror (as depicted in Fig. 1) is to transform the phase φ 1 (x) of an incoming field to a new phase φ 2 (x) of an outgoing field according ...
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Citations
... This paper sees the culmination of several theoretical and experimental studies over the past few years for the generation and application of intra-cavity flat-top beams [5][6][7][8] . A designed axisymmetric DOE mirror is shown in Fig. 1(a), with associate output intensity given by Fig. 1(b). ...
Copyright 2009. Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited In this paper the researchers present results on improved paint stripping performance with an intra-cavity generated Flattened Gaussian Beam (FGB). A resonator with suitable diffractive optical elements was designed in order to produce a single mode flat–top like laser beam as the output. The design was implemented in a TEA CO2 laser outputting more than 5 J per pulse in the desired mode. The FGB showed improved performance in a paint stripping application due to its uniformity of intensity, and high energy extraction from the cavity.
Piezoelectric bimorph- or unimorph-type deformable mirrors are commonly used in adaptive optics to correct for time-dependent phase aberrations. In the optics community, the surface deformations that deformable mirrors are required to achieve, are routinely and conveniently described using Zernike polynomials. A Rayleigh-Ritz structural model, which uses Zernike polynomials directly to describe the displacements, is proposed in this paper. The proposed formulation produces a numerically inexpensive model that predicts deformations with remarkable accuracy. Since design variables, such as electrode layout, material properties, and mirror dimensions, are represented analytically, the model is well suited to optimization or sensitivity analysis applications. Furthermore, since the numerical implementation is very efficient, it could be employed in closed-loop control applications. Results achieved with the proposed model compare well with results from a traditional finite element analysis as well as experimental results of a representative design.
In this paper we outline new approaches to old problems, namely understanding the transverse modes in Porro prism resonators, and creating methods to select Gaussian beams by phase-only intra-cavity elements. In the process we outline some of the recent research that has taken place within the Mathematical Optics research group.
