From Jean.C.Shelton@jpl.nasa.gov Wed Oct 10 14:29:23 2007 Date: Wed, 20 Jun 2007 17:57:56 -0700 From: Chris Shelton To: Jenny Roberts Cc: Antonin Bouchez , Ed Kibblewhite , Renu Tripathi , FANG SHI Subject: laser zemax files Hi Jenny, Antonin, Ed, Renu, Fang, Here is a zip of laser zemax files, plus a spreadsheet summarizing the useful eigenmode solutions.  These should all go on the Twiki site. Most of the zemax files solve for anisotropic eigenmodes of the laser cavity.    This is done with the optimizer.   The merit function is set up to force a beam waist, which in general will have different values for x- and y-radius, at the outcoupler (OC), and to force a match of the gaussian mode radius of curvature to that of the high-reflectivity (HR) mirror, again, for both x- and y- gaussian mode propagation.  The HR radius is currently 5m. The slabs (actually pass one and pass two of the same slab) are set up with a y parabolic index gradient, meant to model the thermally generated index gradient.  The internal bounces in the slab are not modeled, hence pass one and pass two do not overlay in the layout plot, and the slab passes do not look rectangular.  It is assumed that the internal bounces suppress the effective x gradient completely. There is a paraxialXY lens between the two retro mirrors that models the pair of physical cylinder lenses that tune out the thermal gradient and make the output beam round. The gradient can be an input parameter and the cylinder lens the thing solved for, or the other way around, by the usual zemax method of tagging the variables to optimize. The files --   user2007.agf - A user glass catalog containing "YAG".  This must go in \program files\zemax\glasscat.  It has an index vs wavelength model.   test.zmx   - test of a basic 2 mirror laser, to cross check with Ed's existing code.   slab.zmx - a test of the YAG glass, also gives internal slab angles.   slab_nrc.zmx - Non-sequential version of above, shows all possible internal bounces in 3D.  Take it for a spin.   laser_2007_06_14e.zmx and .ses  - Full laser model, showing the first set of eigenmode solutions, for y power of -0.2 to +1.0 diopter   laser_2007_06_14f.zmx and .ses - Full laser model, showing the second set of eigenmode solutions, for y power of +2 to +5 diopter.  These are not desired solutions. In the spreadsheet, the variable "y power" turns the power of the paraxialXY lens up and down, thus corresponding to Ed's existing analysis.  The gradient power is kept at zero. Chris