# aluminum reflectivity vs thickness

Mentor added his name as the author and changed the series of authors into alphabetical order, effectively putting my name at the last, What modern innovations have been/are being made for the piano. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. story about man trapped in dream, Using public key cryptography with multiple recipients. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Reflectivity vs Coated Aluminum Thickness. Any help or comment is highly appreciated. Is a software open source if its source code is published by its copyright owner but cannot be used without a commercial license? 2004-01-08. rev 2020.11.24.38066, The best answers are voted up and rise to the top, Physics Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Aluminium nitride (AlN) is a nitride of aluminium. High purity improves electrical conductivity. 2004-01-24. Try asking engineers at II-VI, Anodized aluminium reflectivity at 10.6 um, why the gemstones can be found in all sorts of different colors, http://www.crystran.co.uk/optical-materials/sapphire-al2o3, “Question closed” notifications experiment results and graduation, MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…. Also high electrical conductivity corresponds to high thermal conductivity, and better cooling. 4 and Table 1)[14, 22]. How can you trust that there is no backdoor in your hardware? At 7.5 um, for 0.5 mm thickness, transmission is ~3 %. If a 1 Watt beam reflected beam from a curved surface comes to a focus, it can start a fire. Can be done if I know the values. *Image From: http://www.crystran.co.uk/optical-materials/sapphire-al2o3. Use MathJax to format equations. How to place 7 subfigures properly aligned? To learn more, see our tips on writing great answers. 2004-01-23. Any hint is welcome. David Grove. Refractive Index Reference - Optical constants of crystalline and amorphous semiconductors, Adachi, pg 150. It only takes a minute to sign up. If the file is not available for download, you can request our proprietary file by clicking This is related to their high damping constant, which leads to a short distance crossed by the light. Aluminium lms of speci c di erent thicknesses were deposited on di erent ceramic slide sub-strates in the di usion pump microprocessor vacuum coater Where should small utility programs store their preferences? Many applications in the optics industry require highly reflective surfaces to maintain laser intensity throughout the beam path. 24 452 R.E. By continuing you agree to the use of cookies. How to solve this puzzle of Martin Gardner? Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. I realize now that I did not take surface reflection into account, which is probably responsible for 15 % loss at short wavelengths in your plot: 2 * ((1.75-1)/(1.75+1))^2 = 0.15. Suggestions for future investigations are given. I would like to be able to properly model angular dependence of such a surface reflectivity. Why does reflectivity suddenly change around critical angle? Metals have high reflectivity, reflecting almost all wavelengths in the visible region of the spectrum. algorithm along with addit. Where is this Utah triangle monolith located? HUMMEL (a) Reltectivity vs conductivity Silver has a higher d.c. conductivity than aluminium (Fig. A lens typically has an antireflection coating. Reflectivity with Complex Refractive Index, Reflectivity coefficients at dielectric interface. Scale at λ of 405 nm..... 23 Figure 16 R2 vs. Unfortunately, I was unable to find a lot of data on Sapphire at $10.6\ \mu\text{m}$. Mon-Fri), +1 858-573-9300 Transmission is 3 %. By using this site, you agree to our updated Privacy Policy and our Cookie Policy. These tend to be powerful lasers - 100 Watt beams are not unusual. Can be done if I know the values. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It is shown that: (1) alloying of silver and aluminium reduces the solar-weighted reflectance, (2) solute additions may slightly improve the corrosion resistance of silver but in turn reduce the reflectance, (3) the parameters which affect the reflectance of a pure metal include kind and number of solute atoms, surface reactions, surface conditions, kind of mirror preparation and interband transitions. From your plot. A typical lens is made of ZnSe, with an index of refraction = 2.4 at 10.6 um. Below are files of complete refractive index and extinction coefficients. They look like mirrors in visible light. and extinction coefficient Experimental optical data on alloys that utilize silver and aluminium as base metals are summarized. The reflectivity for aluminium in the visible and IR region is therefore expected to be smaller than that of silver. Its wurtzite phase (w-AlN) is a wide band gap (6.2 eV) semiconductor material, giving it potential application for deep ultraviolet optoelectronics. This can cause problems. 2004-01-24. Nels P Ostrom. 2) Specify a thin layer of corundum on top of a bulk aluminium part in Zemax. However I could not find the dispersion data for Al But the result (huge absorption at >8 um) stays the same. Do you agree with this understanding? However, when we talk about sapphire in optics we are usually referring to the crystalline form, and I'm not sure if your $20\ \mu\text{m}$ coating will be crystalline or not. But the mirrors must still be polished. For λ = 10 um it will be even higher, unless there is a local transmission peak there.