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Questions related to Optics
Dear all, I recently meet a problem when I use RCWA codes. In the same structure, it tooks fewer time when using the FDTD solution. I need set a lot of orders to calcuate the structure which can...
03 November 2019 5,056 2 View
Dear Sirs, The setup for the dispersion measurement is as follows. Hg lamp, collimator, goniometer with triangular prism. We measure the light dispersion using the prism. To do so we determine...
26 October 2019 2,875 8 View
I currently work with polycaprolactone, which has a low melting point (~60C), but poor transmittance without heating close to the melting point. Please suggest a low melting point polymer (70%)...
25 October 2019 763 1 View
Core of Rocky planets made of molten metal, as the planets rotates, generates magnetic fields. But how? I have seen induction equation of MHD, (both maxwell's equation and Navier-stokes equation)...
03 October 2019 8,591 1 View
I had this question for years. I frequently (like almost always) find optic designs that expand collimated SMF output into larger diameter beams (something like two achromats after a small...
02 October 2019 8,309 7 View
We have LG10 beam only and we have to get HG(1,0).
01 October 2019 7,871 6 View
Evidence is preferred first, then the speculation. I only have speculation. Bobcats seem to rule out a thermoregulatory reason. The absence of a tail suggests a lack of tighter turns taken and no...
30 September 2019 7,482 11 View
In a camera (photography), the depth of field/view describes a volume within which objects are acceptably in-focus. Can this behaviour be reversed for a projector to allow the same focal setting...
02 August 2019 4,754 3 View
The common conductivity of bulky gold is 45.2e6 S/m. However, in some papers, the value is set as 7e6 S/m, namely, lossy-metal model. (Operating frequency is around 1 THz, thickness of gold film...
31 July 2019 6,108 2 View
I am trying to get output of laser beam from a FOC laser beam with diameter ranging from 100 microns to 1000 microns. The FOC diameter is 200 micron and NA is 0.22. What kind of lens or...
03 July 2019 6,140 3 View
I am trying to understand how the depth information in SD-OCT A-scans is obtained over distances far in excess of the source coherence length. From what I have gathered so far, it seems that the...
11 June 2019 7,128 2 View
Now I am studying k.p theory based on FD method to calculate the energy band structure of semiconductor, but I find that the number of discrete points (dz) has a great influence on the output...
14 April 2019 1,381 0 View
Need to have high efficiency around 600 nm. Thanks!
10 April 2019 3,120 5 View
Hi everyone. I konw Gaussian matrix in is very useful in mathematics. But in some applications, we need to transfer the mathematical formula and implement it into the real world. Talking about...
04 April 2019 8,028 7 View
I understand that the compressed air for the laser optics purge (first step of cleaning) such as mirrors or lenses should be "clean", but does anybody can explain me what really does it mean...
02 April 2019 8,306 5 View
Hello everyone. In my research I have come across the need for a material or coating that has the property that it is transparent for horizontally polarized light, while reflective for vertically...
02 April 2019 7,413 3 View
I need to study the surface of nylon-6 blank fibres with a thickness of nearly 40 micrometre, I work in optics lab with many optical components such as beam splitters, lenses, mirrors ... etc, can...
19 March 2019 541 3 View
I need surface reflectance in Sentinel 2 images, What is the best way to perform atmospheric correction in SNAP? Using Sen2cor plugin?
15 March 2019 9,236 4 View
Hello, I want to very accurately measure the distance between my microscope objective and my substrate using is an optical fiber sensor from Philtec. In order for the fiber optic to work, the...
11 February 2019 2,208 2 View
Hi, Maxwell Stress Tensor (MST) method is usually used to calculate the optical force exerted on an object. However, my question is about the applicability range of this method. When do we use...
29 January 2019 4,522 3 View
I need to understand the concept of bright mode and dark mode completely. I know that by the destructive interference of bright and dark modes we achieve PIT but what is exactly bright and dark mode?
11 January 2019 1,781 3 View
We are a research group working in the field of laser processing. We want to build our own femtosecond (or picosecond laser) for micromachining (fine marking for example). Do your know any low...
24 December 2018 6,229 8 View
Suppose a highly intense laser beam of 10 kW is incident on a mirror and a lens. Which of the two can withstand the power without getting damaged.
18 November 2018 6,807 17 View
I am looking into buying an optical table for high-resolution confocal microscopy and patch-clamp electrophysiology, and I am wondering which brand to go for. The table should be around 1.2m x...
30 October 2018 10,186 9 View