Received: from jeans.ifa.hawaii.edu (jeans [128.171.79.127]) by duke.ifa.hawaii.edu (8.9.0/8.9.0) with ESMTP id NAA22907 for ; Tue, 16 Jan 2001 13:26:51 -1000 (HST) Received: from hale.IfA.Hawaii.Edu (hale [128.171.2.6]) by jeans.ifa.hawaii.edu (8.9.0/8.9.0) with ESMTP id NAA09146 for ; Tue, 16 Jan 2001 13:26:50 -1000 (HST) Received: from smtppop3pub.verizon.net (smtppop3pub.gte.net [206.46.170.22]) by hale.IfA.Hawaii.Edu (8.9.3+Sun/8.9.1) with ESMTP id NAA14716; Tue, 16 Jan 2001 13:26:45 -1000 (HST) Received: from verizon.net (1Cust29.tnt2.hilo.hi.da.uu.net [63.10.189.29]) by smtppop3pub.verizon.net with ESMTP ; id RAA97192746 Tue, 16 Jan 2001 17:22:09 -0600 (CST) Message-ID: <3A64D8BC.7F089559@verizon.net> Date: Tue, 16 Jan 2001 13:26:52 -1000 From: Chris Shelton Reply-To: shelton@mtwilson.edu X-Mailer: Mozilla 4.76 [en] (WinNT; U) X-Accept-Language: en MIME-Version: 1.0 To: Doug Toomey CC: Vern Stahlberger , graves@ifa.hawaii.edu, northcott@ifa.hawaii.edu, doc@ifa.hawaii.edu Subject: Re: IRTF WFS 2000 Sep 1 References: <39B07AF5.26C0F843@mtwilson.edu> <39C6835E.470A0BAA@mtwilson.edu> Content-Type: multipart/mixed; boundary="------------26919901719A7C0979149593" X-UIDL: 7fa43f90e7ddc48b280231db912064eb This is a multi-part message in MIME format. --------------26919901719A7C0979149593 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Doug, Yes, there is a mistake in the email describing the optics for the IRTF WFS. The zemax and igs files are fine. Part 2, the WFS Collimating Mirror, does not really have the same radius of curvature as the Camera Mirror; the correct radius is -1035 mm (concave). As near as I can tell, the rest of the text is ok. Here are some new numbers, for baffle sizes. The first three are my readings on the baffles inside the dewar between the window and the dichroic -- this is just a cross check. Surface 17 53.6 mm square 18 69.8 mm diameter 19 69.6 mm diameter These baffles are in the WFS: Baffle 1, on the steering mirror face: 14 mm diameter. This is the pupil stop for the WFS. If it isn't there, the WFS will see past the secondary to the sky. Baffle 2, 300 mm downstream from the steering mirror: 18 mm diameter. This baffle catches the rest of the field outside the region that you have steered to. If you do "visible science", this baffle should be resized to accommodate the size of your visible science field. If you put the splitter for the visible science field just before the membrane mirror, as we talked about today, the visible science field will always be centered on the guide object, and not steer with the IR field. Besides the baffles just mentioned, there is also a field stop assembly just before the membrane mirror that provides the adjustable field stop for the AO. You mentioned on the phone that you were looking for the zemax file for the AO relay. I've attached relay2000sep1a.zip, which contains relay2000sep1a.zmx. Regards, Chris S Chris Shelton wrote: > > Doug, > > Here is the final optical design package for the wavefront sensor (WFS) > for the IRTF telescope. > > The zemax and iges files have not changed since September 1, but I am > attaching them anyway to provide a complete documentation package in > one place. They are: > > wfs2000sep1.igs.gz > wfs2000sep1c.zmx.gz > > In this final version, all mirrors are flat or concave spheres. > > The design successfully matches the astigmatism of the WFS to that of the > science instrument closely enough to get high strehl ratios with all > spherical optics. For this to work, the astigmatism direction as well > as magnitude is matched. Cancellation is perfect at a dichroic thickness > of 11.4 mm, giving an effective on-axis strehl of 0.999. With the design > thickness of CaF2 of 6.5 mm, the on-axis strehl is still 0.97, with no > software offsets. This is at 0.85 micron. > > The off-axis strehl ratio, at the four corners of the 80 arcsecond square > field, is 0.95, 0.81, 0.78, 0.80, for 0.85 microns and a 6.5 mm dichroic. > > The prescription for the clear aperture of the mirrors was chosen to give > an instantaneous field of view of the WFS of 8.1 arcsec diameter, > steerable over a square field 80 arcseconds on an edge. > > The surface flatness spec allows a combined strehl degradation of 10% at > 633 nm from the four mirrors before the membrane mirror. This not > unnecessarily tight, as the bulk of the non-common-path OPD error budget > will need to go to the dewar optics. > > All the sizes given are minimum sizes to give 80% clear aperture. > A larger part can of course be used if it fits and is a catalog item. > > The thicknesses are for a 6:1 thickness to width ratio. > > *** Prescriptions for the optics *** > > All parts are mirrors, with > Pyrex or equivalent substrates, > Enhanced aluminum coating, > To be used over 0.5-1.0 micron, > 60-40 scratch-dig. > > 1. WFS Fold mirror > Flat, rectangular, > 58 x 82 mm minimum (10% margin all around clear aperture), > 14 mm thick, min., > 51.6 x 73.4 mm clear aperture, > 1/20 wave PV surface accuracy at 633 nm over the clear aperture. > The clearance between this part and the rays returning from > the collimating mirror is tight, so attention should be given to > having a small polishing margin on one of the long sides. > The vendor may want to make this size part of silica or zerodur > in order to meet the flatness spec. > > 2. WFS Collimating mirror > Concave sphere, round, > 1620 mm radius of curvature +/- 0.5%, [This is a typo, the correct radius is -1034.56 mm] > 4.00 inch diameter, > 17 mm center thickness, min., > 80% clear aperture, > 1/20 wave PV surface accuracy at 633 nm over the clear aperture. > The vendor may want to make this size part of silica or zerodur > in order to meet the flatness spec. > > 3. WFS Steering mirror > Flat, round, > 1.0 inch diameter, > 5 mm thick, min., > 55% clear aperture (only central 14 mm diam. is used), > 1/20 wave PV surface accuracy at 633 nm over the clear aperture. > > 4. WFS Camera mirror > Concave sphere, round, > 1620 mm radius of curvature +/- 0.5%, > 1.0 inch diameter > 5 mm center thickness, min., > 80% clear aperture, > 1/20 wave PV surface accuracy at 633 nm over the clear aperture. > > 5. WFS Lenslet mirror 1 > Concave sphere, round, > 3119 mm radius of curvature +/- 1%, > 1.0 inch diameter, > 5 mm center thickness, min., > 80% clear aperture, > 1/4 wave PV surface accuracy at 633 nm over the clear aperture. > > 6. WFS Lenslet mirror 2 > Concave sphere, round, > 4990 mm radius of curvature +/- 1%, > 1.0 inch diameter, > 5 mm center thickness, min., > 80% clear aperture, > 1/4 wave PV surface accuracy at 633 nm over the clear aperture. > > > > This should finish Phase II of the IRTF AO optical design. Please > let me know if there is anything else needed, or if we can declare > victory for this round and move on. > > Regards, > > Chris S > > ------------------------------------------------------------------------------ > Name: wfs2000sep1c.zmx.gz > wfs2000sep1c.zmx.gz Type: application/x-gzip > Encoding: base64 > > Name: wfs2000sep1.igs.gz > wfs2000sep1.igs.gz Type: application/x-gzip > Encoding: base64 --------------26919901719A7C0979149593 Content-Type: application/x-zip-compressed; name="relay2000sep1a.zip" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="relay2000sep1a.zip" UEsDBBQAAAAIAOkYISmI3X6YEgkAAFNKAAAmAAAAQ0FSUEUvaXJ0Zi9yYXl0cmFjZS9yZWxh eTIwMDBzZXAxYS5aTVjVW9ty2zgSfXeV/gE/AAzul0daF0c7kqiRZDuZN29iz7g2a2/ZzsP+ /TZJkaDuhEGyapWKDFAQGn36crrh5G68WiPLtEKMOjW4WiTzMZquNhOUjJLlZno3Rin8GK7h o3QzRgwtXj8e3wkh2wccoe1IZKPbxXSD5vPB1WSWJoOr5e1yhKwWRhGOBKWMGDu4upkkQ0QR hdEw2aDpYrJKVuPR4GqVTOeIETrGFiRlf/JVy9v1l2xUzNajeQIjBjI235bZk1UKUjismw6v s+dfJ7MRrMCUUAYvVP7cfzC4+lasPLkQVysn9zcblK+gR94HV/fJ3QzGFjC8z5fCceBZ/jOd rXNVturczABzeD5MJws0TJPNdHFDRskGVLtdTbIVCIFmY7TeJItRshplD4a3qzuPAULrWXKN OM+Go+n6zwzEKWD/rXiQzCu0si1ZvkM6n6PlajpPVt9Oi8CaKMmVM5xJ8ItHTKnalyoqqdhQ DvbiShidC7mZJWs0n65W6ar4FqCTvY4NdhbQ+rA47mKKMKv0YYoLYoU2rqYYrxRbj+ELo61q 6026PKNiLsgoJqwSWhuzr5+s9OtcPSKY1NxkT5Z/3i7BRTArjlIozTlilbaiuWcIV+lAjx2c EVWcSgafPD+YEsRJp6ywNWvI6nzDNF2Nrle/+/OR7Z7Z3+qUzOaKJ6s52mqdj3ltLGpjWRur 2ljXxqY2tiWSJQoHgaGqE19PM4sMv1YnZkRr67hxzGmpsjgwZQCXp9f9nr4rG6oaIDrUhPEW hAmMZeX4kSY1lQYXg4RVW4GhCWSEA2g0r+1sm+/s8zJXlAhFbbW1VERAVqGyvrULhV0Ewi4N KGQc1ZLRIr+1GEUsf5yn4Uk6G7HmOMndndtLr4UVJXGUCs5FJfSPZAnGRUKXR/eHbYi8ikc+ 83iJ3M4GoZbAUK9xYuHNCe9cO1bhoapFJTQFtR1lzgnKpPRZIcKrPN01PH/o8bEkhjvnjLaK Cm/YlqIiN3YVFd4aF6PC7O7cdt4XnEio+E1R+JSn9VTYUeY/hnYRCUxEhcIJ+IOpjIeGdv3I WGW1nIOSmSlteJACFihBCkgRxdfyOjBvf5ixhCnBjyuYu8nWv4YBSVdXgpmDmlprLg313CfA v7SSmsq6ME9+TZPJKYri2oAjeIQEdBHEZS9jleXWs9PpioldxNQRARoYKpU7AZ+r4EuTJYPR bHYaw6Jn4JoxxyyF0GF8D1Vbicb7srtrigRT0FErxUx5luEMGI4inRs5vR5ljTauIC+aJhpq S3fClPjQlqfiIyykMYdYIpaZ47bjwazNvJzTsY29y7bfanDfqyYpGs0rDcZ340WyXn6pNLBE GQXErrSVmmWdh93vPLz/7xuEQF9rjKCOgavCdwvF7+Bz1L6Z8lHLRRtXBMLMCVUVbVuXhg9M iWVAJ8zt+ePGsml5XlpnU+5b4YPG8uCA/+dt5HEAgssJ5t3zYoRm3iwgC+ysjAGGcyMI1dRV WtG6MuGlhDmhTFcJ8yLdcV8tAN1xNEx8BvoE2zHfufVMd0wpKLHKwzShu/DS5VQheITvgkuX y7bEsBeUYOU15L4hg+8Kgm/ZsGy7FxJbc257oZCbTNbxTaam4L7QkIjKp4pLAo2kKE8fXG5w D04Y5Mu8IeJxdwNCacKF5FzW7p12zOFrkUn6290/UDKb3izm48UmVNHQe6jPK3XCsUSlySZd onQCiW2GrtOvlSIBd1DcOOKDTnLimHPW1i/qRPAdd5Om0q/pACFVIXQ/XYzS++bI+EZRk2Kb PPiGyYS3EnoCutsSlTzo4AHNsqlVtWGph25+8L0LlJPCWP5WCvA3x5FtEWQU63MuVC0+tgV4 0O5Nd4zFfdNO678mspXF138QdJ1MJrNxc/CY398oIk0dQUGZ0UbvZEpIVqLkWuGb6mCx/jZe 16xmwA0U5fvNgCzdQtLPS/S39NLnSaEJgwQqnNwTmelWiAzvPpukyTrrtp8GpE/5o+nwyyqd DgOQ8jlSkw4SgaQ7kclNftzi3CGlgjoCwrm9w39heaqux4L4jwSS9YiXrL2Ilyes65N8cBT4 /ljWLgEl0cooyex+FNhSpP68SF/SKc+3QhAnLKVyP9ZF2fZL82mR3EPoJBF1odRIpXy0F14i 84apkOrT6eS3LAeizWQZINnnNW+7/I7VUsXqtYV0Le86mk/WCMG4+Ft7tTkdXF3PFr+j9cfD 2wd6fUI/Hp8efv38QP9+fHv+QE+/Xr5/PL++kO2yxWu14OH5DX38/fz9Xy+P7+/on6+/Xn48 vP0XfX99ef94e3h++Xg/8qW/fj7A4mZfS//z+Pbw8uMdPb2+oafnx58/IFMNrtLl6OtWD3Ze tfyNMJ1dsQopiyl31AjhrDhcDKkCPrVQMmY3CaFyhBIgRjhWTDXjwnAp9OFikCO1kpyxrB4N lQOturNcGVFMLVMGYl2qw8WR+ghlGNXWXFwcJ8fQTIyxlxfH4eYkc1qxY0DtTeP0qfsb7snf cE/+hrvyN9wTbrgn3HB/uPk45UQZqpyWIvvNwXGFIgT5QIW+gkkpubCnBUUg5yPVEM6grZda dqJRL9SAe6IG/HlqOEW3/JBu8V7CPpg2xZSTUn7+j1TDBTUFNSuFC0A/KagpqvEaNWTcaEFN KTcauqacG61RU/Jo1evOsUerXneOPuI0CuDdaEH9QBfAvPEaNaXeaEmNuTcavMbk26rjdccU AfTbquMFMcUpAhZH+t2QVBgD60VBbcF6UVBbBHxZo5YI+KKgnekZQdHQtUXAQV4XwyJBXhfD IkFeF8Mi5wW1SMAXBfUDXYsEfFmjtgj4oiQ/jSTgi5JaI+Agx0N9OR7qy/FQGwQsL3bAh0VB R3XNoaCO6ppDQR11wEc06qYDPl+4nRMUDV1HHfB5r4thkSCvi2GRIK+LYZHzgnBf0OG+oMM9 QtdVB3xu2m4HfDjtqgM+73jdMQXuiylwBwSsLnbAh4mjo7rmUFBHdc2hoI464CMaddMBHwra mZ4RFA1dRx3wea/DfXldDIsEeV0Mi5wXhPuCDvcFHe4Ruq464HOZvt0O+FBSVx3wecfrjilw X0yBI5hivridZ/8x939QSwECFAAUAAAACADpGCEpiN1+mBIJAABTSgAAJgAAAAAAAAABACAA toEAAAAAQ0FSUEUvaXJ0Zi9yYXl0cmFjZS9yZWxheTIwMDBzZXAxYS5aTVhQSwUGAAAAAAEA AQBUAAAAVgkAAAAA --------------26919901719A7C0979149593--