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Questions related to Optics
If two or more beams are overlapped or combined at a point in space, what will be the resultant spot size at the point of combination?
17 August 2017 9,349 2 View
Q-factor= 20*log10(sqrt(2)*(erfcinv(2*(BER)))); I have searched a lot but unfortunately I only found the equation above that calculate the Q from BER ,but the Q will be infinity when the BER is 0....
15 August 2017 497 3 View
According to ASHRAE the values of tb and td for Atlantic, I want their values according to cities or latitude and longitude Thanks
04 August 2017 5,679 4 View
It is obvious that solar radiation can be concentrated using any optical concentrator such as lenses or parabolic mirrors. This is possible because the solar rays are parallel as they are coming...
19 July 2017 10,015 3 View
I am reading about the Diffuse Correlation Spectroscopy for non-invasive, micro-vascular cerebral blood flow measurament.The device used for the topic is a combination of DCS+NIRS/DOS. The system...
12 July 2017 5,893 4 View
Required little help to explain Resonant (leading to Kerr, Kerr-quintic nonlinearities) and nonresonant (leading to the transitions in quantum levels) optical nonlinearities.
11 July 2017 8,816 2 View
How to settings the adsorption and refractive index for measuring particle size in suspended using a Malvern Mastersizer 3000 E?
10 July 2017 8,511 4 View
When I expand the phase mismatch (for three signals interacting nonlinearly in optical fiber delta-beta with dispersion slope (dB = B(f1) + B(f2) - B(f3) - B(f1+f2-f3) , where B (Propagation...
09 July 2017 6,938 3 View
When simulating light pipes, will the choice of a source (collimated beam vs angular beam) make any difference on the efficiency of the light pipe to channel light from source on one end to the...
05 July 2017 3,653 3 View
Hi, Any advice on how to track stem cells in vivo for
29 June 2017 6,902 3 View
I have a bulk quasi-phase matched non-linear crystal with waveguide dimension of 5um*4.5um, as provide in this link http://www.hcphotonics.com/products2.asp?area=1670&cat=1751&sn=938. Is...
25 June 2017 5,458 2 View
Hi everyone, What configuration of lenses is utilized to make light sheets for imaging purposes?
19 June 2017 6,526 3 View
Is there a concept of optical oscillators (like an electronic LC oscillator) or a tunable laser can be used as an oscillator?
09 June 2017 1,903 3 View
I am looking for a high power LED with a central wavelength of around 488 nm. I know Thorlabs sells one at 490 nm that supplies 216 mW of optical power at 488 nm. However, I need at least 1 W at...
02 June 2017 4,566 3 View
"One of the most fascinating predictions of the theory of general relativity is the effect of gravitational lensing, the bending of light in close proximity to massive stellar objects. Recently,...
31 May 2017 9,024 3 View
I have removed Fresnel lens from rear projection TV but it is plane/smooth/without grooves/without Newton rings. It concentrate the solar radiations to some extent. The Fresnel lens with grooves...
30 May 2017 497 3 View
Is it possible that there is a kind of amplifying mechanism, that just like EDFA to amplify 1550 nm optical light, to amplify ultrasound signal?
22 May 2017 9,089 3 View
I see that many papers based on film random lasers (like polymer films) show very low lasing threshold compared to colloidal random lasers (like rhodamine6G based ones). Is this true in every...
12 May 2017 1,157 3 View
Hi I am trying to figure out a technique (other than GFC/SEC/FPLC), to track the oligomerisation of my protrein complex of interest. Something which is fast and acceptable. Any biophysical...
12 May 2017 2,782 6 View
I need an answer on that question
06 May 2017 1,941 3 View
I am trying to simulate an aperture type FSS, but during oblique incidence, i am getting discontinuity at an offset of the resonance frequency. Can anyone explain the reason?
03 May 2017 2,488 3 View
Considering a Hermite-Gaussian (HG) Beam as a perfectly plane wave and ignoring the phase due to curvature(exp(ik(x^2+y^2/2R)), the phase of lobes is pi phase shifted from its neighbor. When we...
01 May 2017 4,740 5 View
I am trying to express and purify a bacterial membrane protein in E.coli Rosseta, after trying different conditions I've got an expression but the protein is insoluable but it seems that it doeas...
30 April 2017 8,416 4 View
I would like to video-record insects under IR light (850nm) in a way to see insects white on a dark background. However, a black material is prohibited because it impact the behavior I would like...
27 April 2017 9,614 7 View