Hello! My name is Innokenty Khvan. I study laser technology and it is very hard to find optical constants for the wavelengthes of lasers. I found your site amazing and wish you to add to your list of wavelenghthes the wavelengthes of the most popular lasers. For example: YAG:Nd laser 1,06 μm C02 laser 10,6 μm He-Ne laser 632.8 nm
Hi Innokenty! I am using refractive index data from different sources. In some of them refractive index is given as a table of values at certain wavelengths, which rarely coincide with laser wavelengths. You can try to do some sort of interpolation in order to determine the constant of interest at a particular wavelength in this case. Very often, however, an empirical formula for refractive index as a function of wavelength is known (for example http://refractiveindex.info/?group=CRYSTALS Option "Handbook of optics" ), and in this case you can easily get the refractive index value at any wavelength in the formula validity range (just type the laser wavelength in microns in "Wavelength" field and hit "Enter") Many materials have several "Options": that is for different sources of data or for different conditions.
Working on the database. No plans for off-line software. Sorry... Come on, this is an Internet age now. So many applications moving online instead. Look at Google docs etc.!
Thank you for providing this awesome website. However, I must inform you that you have an error on one of your pages. I have noticed that the Sellmeier formula as reported on your webpage for potassium titanyl phosphate (KTiOPO4 or KTP) is incorrect. The formula on the webpage is missing a factor of (lambda)² in the numerator of the second term (see: Fan et al., 1987, which is the publication referenced for KTP in Hndbk. of Optics II). I haven't checked the formulas of any of the other materials that you list.
That said, I wish you continued success in developing this website!
I really like the way you have manged to compile all this information with spectra. I realize there is a lot of work involved in this, but it would also be nice to have the imaginary part of the refractive index too (absorptivity), as this is often even harder to find than the real part of the refractive index.
First thanks for providing this really useful webpage. I'm working a lot with semiconductors and I was interested in refractive index for different wavelengths. First comment: I think you include the wrong file from Sopra n-k database for AlGaAs 41.9% Al content. Its the same like AlGaAs for 0% Al. Perhaps you can check sometime.
I downloaded the n-k database from Sopra on my own. Can you tell me how to get the wavelength information? This file has only n and k included but no energy axis? Can you help me? I would like to generate out of these data some approximation for AlGaAs at different Al content and also Temperature..
I just finished checking some of your data. It seems that your files for GaAs (same as AlGaAs f0r 0% Al) is already for 10K. So some suggestion for improvement: note the temperature at least for semiconductors, where the refractive indices are valid..
AlGaAs 41.9% Al data is fixed. Thanks for reporting the bug! I can't see the problem with GaAs... Could you please provide more detailed explanation? Thanks!
with GaAs is all right. If you choose e.g. GaAs one has the chance to download the refractive index for different temperatures. If one choose AlGaAs one can chosse different Ga content but not the temperature anymore. I had the problem, that I didn't know for whcih temperature the refractive index for AlGaAs are valid. After checking the curves I found out that they are valid for low temperature (around 10K). I wanted to suggest to mention the temperature for AlGaAs. Best would be for sure to have AlGaAs also at diffenrent temperature..
the AlGaAs data is for room temperature (see the cited paper by Aspnes et al.). In general, if temperature is not specified it is assumed to be room temperature. How did you get 10K?
I was thinking a lot about this suggestion... well, this is not very difficult to include a matlab code generator. The thing is I don't think that this feature will be really used much: you don't need to plot n(λ) every time especially when this plot is already present in the site. Those few people who need this can easily write a couple of standard lines of code and copy-paste formula there. Of course, I can change my mind in future, but now I would prefer to avoid overloading the site with features and concentrate on updating and expanding the database. Anyway, thanks for the idea! And as I said I can change my mind if many users will requests this feature.
ok... the original data is 80 years old, but anyway: C1 = 0.452505 (error introduced in the 3rd edition) apart from that: C4 = 0.000150 (both 2nd and 3rd editions have 0.00150) and range: 0.495-0.670 (not 0.490-0.670)
Home
Discussions