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KNOWLEDGE CENTER - FRONT SURFACE MIRROR |
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Does the shape of the first surface mirror matters ???? Optically flat first surface mirror comes in circular, rectangular and square. Which shape to obtain sometime could be a headaches for most beginners. Listed below are some of the factors to be considered, though it might not restricted to those listed below.
Commonly found with a high precise flatness that the most demanding application required. Being circular in shape means that they can be easily mounted to any circular lens holder hence able to share the same piece of holder as the lens if consideration is made initially, thereby cutting down on both cost and complexity of having different holder for various optical parts. Use mainly in transferring/redirecting of light beam. Rectangular Mainly used for diverging of rays 90°. Most come with a design optimization of length to breadth ratio of 1.414, yielding a square aperture when light incident at 45°. Could be easily cut to smaller pieces for cost effectiveness. Square (most popular) Commonly found in commercial grade, this type of front mirror offers an alternative to circular mirrors when precision and accuracy is not necessary. Cost factor is then the main consideration. Flatness accuracy could range from 2 wavelength and above. |
| KNOWLEDGE CENTER - MOUNTING METHOD FOR MIRROR TYPE BEAMSPLITTER |
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Mirror type beamsplitter comes in various forms and sizes. Commonly found are the circular, square and rectangular shape. Being planar in shape, it introduces an additional axis of rotation as compared to the cubic type beamsplitter. As such, the both the x and y-planes of the mirror type beamsplitter have to be aligned. One of our suggestion is to use a circular type of Ø 1" (25.4 mm) or Ø 2" (50.8 mm) with their respective lens mount. This would permit the lens, mirrors and beamsplitter to share one type of mechanical mounting, thereby having a simple and more cost -effective implementation of equipment. |