The flatness of an optical stage usually refers to the variation of the actual surface to be measured relative to its ideal plane within the unit area. Usually, the flatness index of foreign optical stages is ±0.1mm/600mm×600mm, but our optical stages are improved to 0.02 ～ 0.05mm/600mm×600mm through the precision grinding process.
Strictly speaking, however, the flatness of the optical stage has no influence on the vibration isolation performance, and the vibration isolation performance of the optical stage is often sacrificed in pursuit of high flatness for the following reasons.
1. The optical platform table, in order to achieve high flatness, usually needs to be ground repeatedly, in the processing process, multiple grinding is easy to make the material deformation, in order to reduce deformation, usually need to thicken the table, but we already know through the instructions of the vibration recovery time, the thickening quality of the table, the vibration recovery time of the platform often doubles (or even several times) increase, in many precision optical experiments, this is unacceptable. of.
2. For the optical components on the optical stage, the height difference caused by flatness is usually negligible, but if it is necessary to take height difference into account, it can be achieved by means of a precision-adjusted displacement table. In summary, the flatness of the optical stage is not related to the vibration isolation performance of the optical stage, but can only be used as an auxiliary index of the optical stage for reference.
3.Optical platform grinding is a limit, the processing limit is generally in ± 0.01mm/600mm×600mm, converted into square meters is about: ± 0.03mm/m2, but the flatness, and marble platform flatness is far from. Marble platform according to the flatness index is generally divided into: 000 level (flatness ≤ 3μm/m2), 00 level (flatness ≤ 5μm/m2), 0 level (flatness ≤ 10μm/m2). In other words, the flatness of the best optical platform is several times or even an order of magnitude worse than the flatness of the lowest grade marble platform, so if you need a high flatness countertop, it is highly recommended that you buy a marble platform.
4. let's take an absolutely flat table surface (actually impossible), if the length×width×thickness is 2000×1000×200mm, usually when adjusting the level, the minimum scale of the level meter is ±30′, if we assume that during the actual process, the adjustment accuracy of the level direction is 5′, and the length direction is 2000mm, then, the height difference between the two ends of the table length direction = 2000×tan（5 (′) 2.9mm, that is to say, even if the table is absolutely flat, after adjusting the level, the height difference between the two ends of the length direction of the table is likely to reach 3mm, so the index of flatness is not very meaningful in the actual use of the case.
Optical platforms offer high performance at an economical price. These all-steel optical stages are also ideal laboratory platforms for optical and laser experiments with industry-leading designers who have a tight grasp of product design and machining precision.
We have experienced and skilled master assemblers on staff. Our products are controlled in all directions from the design concept to processing and assembly technology. We provide high quality products to our customers. If you want to get more information about good quality optical stages, please contact us.
