ADJUSTABLE REFERENCE MIRROR -- D-644Model D-644 Adjustable Reference Mirrors are used as transfer mirrors when two or more surfaces are too far apart to be aligned and observed through a single autocollimator with reasonable aperture size.
Cost of an autocollimator with an aperture large enough to cover a comparable area would be extremely high, but the function can be performed inexpensively by aligning one moderately priced autocollimator to the large Model D-644 Adjustable Reference Mirror. By sharing the aperture of the autocollimator using the Model D-644 Adjustable Reference Mirror as a reference, any number of optical surfaces can be aligned within 1 arc second by repositioning the autocollimator. These rectangular mirrors are also used where space is too limited for the larger base and diameter of a round mirror. The Model D-644 Adjustable Reference Mirror works on a base less than 4 inches square. Exceptionally fine 120 threads per inch azimuth and elevation screws provide precise adjustment in either position. |
Detailed Specifications for all Models:
| Flatness | ¼ fringe, maximum 1 arc second transfer deviation along entire length. | |
| Surface Quality | 80/50 per MIL-O-13830 | |
| Material | Mirror | Pyrex Glass or Zerodur |
| Mount | Aluminum | |
| Coating | Aluminum with protective overcoat per MIL-M-13508 | |
| Mirror Dimensions | Height | 3" |
| Width | 9" | |
| Thickness | 1½" | |
| Overall Dimensions | Height | 4" |
| Width | 10½" | |
| Depth | 4" | |
| Finish | Ivory Enamel | |
| Mirror Weight | 6 pounds | |
| Shipping Weight | 15 pounds | |
Model D-644-101 is front surface only.
Model D-644-106 has both sides coated and is plane parallel to 1 arc second or better.
Davidson Optronics, Inc.
Phone: (626) 962-5181
Fax: (626) 962-5188
E-mail: sales@davidsonoptronics.com
