Research on optimization technology of high precision milling equipment for planar optical elements

2021 ◽  
Author(s):  
Jinfeng Bai ◽  
Huiying Zhao ◽  
Shenggen Zhu ◽  
Lingyu Zhao ◽  
Mingchen Cao ◽  
...  
Keyword(s):  
High Precision ◽  
Optical Elements ◽  
Milling Equipment

Diamond Machinable Sol-Gel Silica Based Hybrid Coatings for High Precision Optical Molds

2010 ◽  
Vol 438 ◽  
pp. 65-72 ◽  
Author(s):  
Andreas Mehner ◽  
Ju An Dong ◽  
Timo Hoja ◽  
Torsten Prenzel ◽  
Yildirim Mutlugünes ◽  
...  
Keyword(s):  
Injection Molding ◽  
High Precision ◽  
Sol Gel ◽  
Processing Parameters ◽  
Hybrid Coatings ◽  
Optical Elements ◽  
Optical Components ◽  
New Approach ◽  
Free Silica ◽  
Gel Processing

The demand for high precision optical elements as micro lens arrays for displays increases continually. Economic mass production of such optical elements is done by replication with high precision optical molds. A new approach for manufacturing such molds was realized by diamond machinable and wear resistant sol-gel coatings. Crack free silica based hybrid coatings from base catalyzed sols from tetraethylorthosilicate (TEOS: Si(OC2H5)4) and methyltriethoxysilane (MTES: Si(CH3)(OC2H5)3) precursors were deposited onto pre-machined steel molds by spin coating process followed by a heat treatment at temperatures up to 800°C. Crack-free multilayer coatings with a total thickness of up to 18 µm were achieved. Micro-machining of these coatings was accomplished by high precision fly cutting with diamond tools. Molds with micro-structured coatings were successfully tested for injection molding of PMMA optical components. The wear resistance of the coatings was successfully tested by injection molding of 1000 PMMA lenses. Hardness and elastic modulus of the coatings were measured by nano indentation. The chemical composition was measured by X-ray photo electron spectroscopy (XPS) as a function of the sol-gel processing parameters.

Research on Eliminating Cumulative Errors for Stitching Algorithm of Large Aperture Aspheric Optical Elements

2014 ◽  
Vol 924 ◽  
pp. 377-381
Author(s):  
Yan Ting Zhang ◽  
Xu Yang ◽  
Xin Li ◽  
Yin Biao Guo
Keyword(s):  
High Precision ◽  
Measuring Method ◽  
Transformation Method ◽  
Aspheric Surface ◽  
Optical Elements ◽  
Fast Speed ◽  
Large Aperture ◽  
Precision Measuring ◽  
Surface Optical ◽  
Datum Transformation

The sptitching measuring method applied in large-aperture aspheric surface optical elements can expand the range of precision measuring instrument. And the key point is developing the technique for high precision measuring data processing. To deal with the problem of cumulative errors which existed in the process of multi-section stitching, datum-transformation method was proposed, according to the characteristic of stitching measurement. The stitching measuring experiments were carried out based on Talysurf PGI 1240 profilometer of Taylor Hobson Company to verify the purpose for eliminating cumulative errors. The results show that datum-transformation method is feasible with the characteristic such as fast speed, high precision, and good operability.

Vacuum aspherization of high-precision optical elements of IR facilities

2004 ◽  
Author(s):  
V. G. Kryuchkov ◽  
V. V. Potelov ◽  
B. N. Senik
Keyword(s):  
High Precision ◽  
Optical Elements

Challenges in mold manufacturing for high precision molded diffractive optical elements

2016 ◽  
Author(s):  
Guido Pongs ◽  
Bernd Bresseler ◽  
Klaus Schweizer ◽  
Thomas Bergs
Keyword(s):  
High Precision ◽  
Diffractive Optical Elements ◽  
Optical Elements

A process for shaping high-precision optical components for ground- and space-based electrooptic systems

2019 ◽  
pp. 77-88
Author(s):  
Vladimir A. GORSHKOV ◽  
Alexey S. SAVELYEV ◽  
Artem S. NEVROV ◽  
Aleksandra V. SMIRNOVA
Keyword(s):  
Standard Deviation ◽  
High Precision ◽  
Surface Shape ◽  
Optical Systems ◽  
Optical Elements ◽  
Optical Components ◽  
Earth Remote Sensing ◽  
Aspheric Surfaces ◽  
Shape Precision ◽  
Surface Shaping

The paper reviews advanced process for manufacturing high-precision optical components used in space-based electrooptic systems for scientific research and Earth remote sensing. It presents an integrated process for automatic shaping (TESAF) of aspheric surfaces, including off-axis surfaces, of optical elements for electrooptic systems. This paper discusses various methods for shaping optical parts with virtually any degree of asphericity and various values of the off-axis parameter (off-axis aspherics) achieving surface shape precision to within λ/60…λ/80 (λ = 0.6328 micron) by the standard deviation criteria. The paper also presents the newly developed off-axis collimators, designed to shape a reference wavefront within a broad spectral range from ultraviolet to infrared radiation. In particular, a mirror collimator with an adaptive off-axis mirror that is capable of changing the wavefront that is being formed in order to obtain the response function of the electrooptical system under study. Optical systems built using the TESAF process are already successfully used. Key words: surface shaping, aspheric surface, surface interferogram, standard deviation.

Fabricating and testing complex optical elements with high precision

2011 ◽  
Author(s):  
Hexin Wang ◽  
Volkmar Giggel ◽  
Gerhard Derst ◽  
Thomas Koch
Keyword(s):  
High Precision ◽  
Optical Elements ◽  
Testing Complex
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