All Questions
Tagged with optical-materials spectroscopy
7 questions
2
votes
0
answers
159
views
What is difference between Electromagnetically induced transparency (EIT) and Coherent population trapping (CPT)?
EIT: Electromagnetically induced transparency
CPT: Coherent population trapping
When two resonant light fields (probe field and strong coupling field) are incident on an opaque material whose atoms ...
- 43
0
votes
0
answers
36
views
How to get rid of unnecessary signal in Photoluminescence Spectroscopy?
I am having some issues figuring out have to get rid of laser residues (might be) or scattering from the setup itself (please see attached pic).
In the lab, we have AUREA PIXEA 405nm laser, Horiba ...
1
vote
0
answers
33
views
Is there a UV-VIS spectral database for common materials?
Looking for a database of spectral data in the ultraviolet to visible range (interested in roughly 200 to 800 nm) for common materials found in homes, vehicles, mass transportation, factories, etc. ...
- 123
0
votes
0
answers
38
views
How to measure thickness of a sunscreen film(nano meters)?
I want to measure the thickness of a sunscreen film. In the current method, I measure the volume of the film and use the area of the substrate to calculate the thickness. But I need a more reliable ...
- 11
1
vote
1
answer
43
views
How can we measure thickness of a wet film without destroying it's surface?
I have an opaque(wet) material thin film on a glass plate. How can I measure the thickness of the film without destroying the surface?
I am thinking that I might be able to use a spectroscopic ...
- 11
1
vote
1
answer
73
views
Which transparent material alters light the least?
I am making a spectrometer as my school project. It's main application will be analyzing the light emitted by various light sources. It measures visible, near IR and UVA/UVB radiation. I need it to be ...
4
votes
1
answer
294
views
Why does the refractive index not mirror the Lorentzian peak shape of the absorption index?
In the characterization of materials, there are many methods used: One of them is infrared spectroscopy. In a lab we saw the indices of refraction and absorption of a certain (semiconductor) solid ...
- 51