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Questions related to Optics
In remote sensing field, passive sensors are used to measure emitted radiation which is converted to temperature via the Placks Law of black body radiation. In natural conditions the reflected...
04 February 2021 4,546 2 View
When first order paraxial optics is expanded to third order optics (i.e. sin x~ x-x3/3! instead of sin x~x) , these 5 optical aberrations result in. What is the rigorous mathematical proof that,...
27 January 2021 9,187 4 View
Dear researchers It's well-known that the maximum light absorption of any structure can not be greater than 50%. Is it possible that the single-pass absorption exceeds 50%? How?
18 January 2021 2,829 7 View
Dear colleagues, We have observed large fluctuations in laser power in our setup and traced them down to fluctuations in laser beam polarisation. Attached is a schematic of the relevant part of...
15 January 2021 8,032 4 View
At the Monte Carlo casino, I saw an unusual advertising image. It rotated around a vertical axis and seemed suspended in the air; there was no screen behind it. The image was bright and colorful....
04 January 2021 9,491 5 View
Good day everyone currently I'm using Rsoft CAD as simulation tool for a Y-splitter, and I have a case when the launch field TE1 and the patway monitors the launch power, byeond the split point,...
29 December 2020 2,281 1 View
Hello everyone. For my experiment, I have a need of moving a ~20 mg optical element (prism) at frequencies of ~2 MHz with amplitudes of ~0.5 μm. I couldn't find any proper device which can fit...
08 November 2020 7,289 4 View
I am interested to know if in a materials which has no absorbance at a wavelength "L", but with strong Mie resonance at this wavelength "L" due to adequate surface structuring, where does the...
26 October 2020 7,830 5 View
Sorry for the naivety of my question. I am looking forward to estimating the maximum power capacity of an optical waveguide, typically, Silicon (Si) or Silicon Nitride (SiN) waveguide. Is there...
20 October 2020 5,318 5 View
Can any one give me clear information how to implement division in xilinx system generator when both numerator and denominator are signals which may be the case we encounter for example in input...
28 September 2020 5,638 0 View
Does B represent the total magnetic field= mu_0*(H+M) or only mu_0*M ? (We apply the external magnetic field as Bo_x, Bo_y in the MHD module) and what does F_x, F_y represent? Body force per unit...
17 July 2020 9,577 0 View
I am using following laser for microscopy. https://www.picotronic.de/picopage/en/product/detail/id/672 Although it is already low power pointer laser I still need to reduce its intensity. I...
14 July 2020 5,120 18 View
I want to place 2 camera lenses (eg Thorlabs MVL12M23 and MVL50M1) inside the inner vacuum can of an Oxford Kelvinox MX250 dilution cryostat. The camera lenses will be thermally connected to the...
19 June 2020 6,391 1 View
Obviously, the spatial light modulator (SLM) and digital micromirror device (DMD) is diffration gratings. Therefore there would be multiple diffraction orders of the created images. Here I want...
07 May 2020 932 8 View
Hello! I need to conduct an experiment, where I should measure thicknesses of different thin films (oil on the water surface, soap bubble etc.). Due to quarantine I have no opportunity to use any...
21 April 2020 9,901 2 View
I have been search for UVC LEDs recently. However, finding an LED with a peak wavelength below 240nm is becoming difficult. Can suggest a way to obtain an easy solution for this. I am aware of...
13 April 2020 867 5 View
Hello, Can anyone comment on the carrier mobility of SOI wafers? I would presume that given the right process, e.g. wafer bonding, it shouldn't differ much from the mobility of bulk Si. However,...
14 March 2020 9,209 1 View
Mostly, CCD camera is used for speckle measurements. I am interested to do measurements with cmos camera, are there any characteristics of cmos camera which can effect my measurements? e.g a...
02 March 2020 4,034 6 View
I am trying to create some pattern with a DMD (digital micromirror device) and I want to configure a FPGA to drive the DMD but I'm running into some problems.
16 February 2020 9,999 3 View
I have a satellite image covering a large geographical area. Its current projection is Geographic (WGS 84). I want to re-project the image into UTM WGS 84. The area is in two UTM zones. I tried to...
07 February 2020 7,057 8 View
I have three collimated optical beams with 1cm separation between the adjacent one. I want to shift one of the three beam laterally so that it goes closer towards or farther away from the adjacent...
01 January 2020 8,067 8 View
Please does anyone have an experience in implementing Decision Trees on FPGAs? I have read a couple of papers and emailed a couple of people but i haven't received very good feedback on how to go...
31 December 2019 3,207 3 View
Hi folks, I am working on the FPGA implementation of neurons. I want to save the time of spikes and few events on a readable file to be examined externally. Do you have any suggestions, please? I...
03 December 2019 8,599 3 View
I am making a polar moke setup and need a non-polarising beam splitter which splits the reflected light but not the incoming one. I would be grateful for any suggestion regarding model number/...
15 November 2019 6,259 3 View