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Questions tagged [optics]

Optics is a branch of physics describing the behaviors and properties of light (electromagnetic waves). Questions regarding the properties of light, it's interactions with matter and the instruments used to detect and deflect (or concentrate) light should be posted here.

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284 views

How can I build a periscope window into a house, maintaining a high quality image at reasonable cost?

My family owns a plot of land on the top of a hill. AT the bottom of the hill is a lake. Between the plot and the lake is a house that completely blocks the lake view. However, it is only 10 or 15 ...
0 votes
0 answers
42 views

How to find the image of an object in case of a tilted spherical mirror?

Problem A lens is used to obtain real image of a point(/small object) at $(75,0)$. This acts as the virtual object for a convex mirror of radius of curvature $100cm$ placed at $(50,0)$ tilted at $30°$ ...
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1 answer
30 views

Fixture to hold and deliver current to crystal cathode in vacuum chamber

At my internship, I have a small crystal (about 5-8mm long by 2-5mm thick) that needs to be mounted in a vacuum chamber (which is 35mm on the inner diameter) to serve as a cathode with 1.0 to 1.5A of ...
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1 answer
37 views

Optical element that selectively attenuates a wavelength band without completely blocking it

I am looking for an optical element that would allow me to selectively attenuate a given wavelength by a factor of let's say between 2 to 5 without attenuating any other wavelength. I know that notch ...
0 votes
1 answer
36 views

Can air be implemented in 1-Dimensional photonic crystals?

As far as I am aware, digging holes in nanostructures or using columns of materials in a medium of air is the main way by which 2D photonic crystals work. I thought it would also be common to ...
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1 answer
49 views

Optics zoom lens elements

How would I go about designing an optical zoom lens configuration that gives me around 25x zoom eg 10mm to 250mm within a package of roughly 100-150mm? Is there a good software or calculator/optimiser ...
0 votes
0 answers
24 views

Inline thickness measurement by optical transmission (Beer-Lambert law)

I am wondering how effective would be an inline system for thickness measurement of diffuse plastic samples based on light attenuation. Sample thickness woud be in the order of a few mm. I know that ...
2 votes
1 answer
278 views

What is the optical Lagrange invariant of an afocal system?

I am solving an optics exercise that requires to design a Keplerian telescope with a given magnification M (negative), a certain object size L and the restriction of not having lenses faster than F/1 (...
0 votes
1 answer
18 views

Can I increase the field of view of a lens+camera system by placing a meniscus lens in front of it?

Let's say I have a camera + lens system. The lens is a standard focal length, let's say 25 mm on a 1/2" sensor, so not wide angle. Instead of mounting a wide angle lens on the camera, would it be ...
0 votes
1 answer
59 views

What is the simplest way to melt an area of plastic powder with light?

I want to melt a 10cm^2 area of nylon powder (melting thickness of 50 microns), and once melted it becomes a solid sheet of plastic. I can only use light radiation to melt this area, not conduction or ...
0 votes
1 answer
25 views

Is there a retroreflector prism that makes incident and reflected beams collinear?

I have an application where I need to preserve the angle of incidence of a laser beam. So, I am looking at retroreflector prisms. However, the only ones that I can find translate the incident and ...
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3 answers
668 views

galvo scanner + rotating off-axis mirror for beam offseting?

diagram: Assuming 1) the scanner can angle a beam anywhere on the circular off-axis mirror and 2) the off-axis mirror can be rotated as an the diagram to any angle needed, can the beam shooting ...
2 votes
1 answer
229 views

Passive Infrared Sensors (PIR) spectrum and reflections

I have a common PIR occupancy sensor (Lutron MS-OPS5M-WH). I am trying to get the sensor to cover an irregular-shaped room. I could expand the field-of-view of the sensor to cover the whole room by ...
1 vote
1 answer
74 views

Which optical filter to use for flat black non-glare aerospace indicator?

I am currently designing a LED light indicator for use in an aircraft cockpit replica. I’m asking for expert advice on the type of lenses to use in order to get a result similar to shown pictures. ...
1 vote
1 answer
82 views

Thermal cameras - what is the practical significance of NEDT in relation to accuracy?

(Hi, I put this question on the elec eng. stack exchange and someone suggested I move it here. This question has also been edited to make the actual question clearer and fix an error). Using accuracy ...
8 votes
1 answer
161 views

How can I estimate blocking window distance in an sCMOS sensor setup?

I am trying to establish an appropriate distance between a spectrograph output window and a CMOS sensor. The spectrograph creates a focused image on the CMOS sensor but I am trying to restrict the ...
0 votes
1 answer
120 views

Prototyping optics for laser rangefinder

I am a software engineer dabbling in optoelectronic systems. I can bumble my way through but I don't really know what I'm doing, and right now I'm figuring out how to prototype optical components. The ...
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1 answer
69 views

Optical table without holes

Most optical tables have holes. Are there also optical tables without holes? Or do these things have a different name?
1 vote
1 answer
57 views

What are the effects of temperature on optical fiber waveform

I am attempting to measure temperature using a signal through an optical fiber. If I send a waveform through an optical fiber, how would temperature affect it? I've looked here (Calculating ...
1 vote
1 answer
102 views

How is light guided by a perfect mirror waveguide for angles not exactly at the guided mode angles?

Take the below image for example: Let's imagine the cladding is really just perfect mirrors, where all light energy is reflected back towards the core. I understand that modes arise by imposing the ...
0 votes
0 answers
21 views

Selecting Spectrometer Slit Size

I am sourcing a new spectrometer for my optics lab and I am wondering how to determine the slit size. They offer 10um, 25um, and 50um slit sizes with decreasing resolution as we go larger. I want to ...
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0 answers
17 views

Single Photon/Electron Emitter

Is it possible to buy single photon/electron emitter in market for experimental purposes? If yes, can you please guide me where and how?
0 votes
1 answer
28 views

Transferring image from one window to another

As per the diagram shown, my inside window looks out on a shared hallway, not the outside. Using mirrors or optics, I would like to be able to see the tree and sun from inside. I can't alter the ...
1 vote
1 answer
149 views

What is the branch of engineering that deals with corrective eyeglasses?

So I was curious about what principle used to manufacture corrective eyeglasses. Of course it uses physics, especially optics. But what engineer branch or degree is needed to manufacture it? I ...
0 votes
0 answers
17 views

Tunable phase delay for RF modulation

I've been trying to understand if there's a way to create two RF signals at the same frequency with a fixed, tunable phase delay. The goal is for one to trigger an RF-modulated laser and the other an ...
0 votes
0 answers
19 views

What is the meaning of labels on the lenses, e.g. 12L and 12H on Computar M0814-MP2?

Computar M0814-MP2 lens comes with small labels attached, e.g. 12H, 12L or 15H: What is the ...
2 votes
0 answers
21 views

collapsing a telescope image cone into an optical fiber

I have an application where a telescope will be receiving light from a laser source, and I need to couple the output, which is the image cone, into an optical fiber. Does anyone have any suggestions ...
1 vote
1 answer
387 views

Lens arrangement for laser tag?

I’m working on a laser tag game using IR LEDs and demodulation ICs. The trick is to force the gun to be aimed accurately at the center of the target. I’m willing to experiment, but I don’t really know ...
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0 answers
17 views

Is it possible to make a isometric camera IRL?

In theory, all you need is a large sensor and a way to focus parallel light - without any sort of converging point.
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0 answers
44 views

What is the purpose of glass element?

I've seen video about range finder and interested in purpose of one of element. Rangefinder works at 120 GHz and annotation in video says that it is glass lens and its purpose is to bend radiowaves ...
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0 answers
40 views

Diffusor for uniform illumination

I have an LED with a beam angle of 120° and I need to illuminate an area in the shape of a circle with a radius of 3.5 mm. My objectives are as follows: Achieve a uniform illumination of the circle (...
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0 answers
33 views

How to translate/interpret lens patent's aspherical equation into more common form

I am trying to define a lens inside of optical software from a patent. The spherical elements are no problem, but the aspherical element defined in the patent seems to follow a form I'm unfamiliar ...
0 votes
0 answers
38 views

What components should I use for a high-power (5kW) projection system, which projects a binary pattern onto a 250x250mm surface(pixel size of 0.05mm)!

For a machine, which I am currently designing I need a very high-power projection system. I have been trying to make a rough concept over the last few days, but have gotten stuck, because I got a bit ...
0 votes
0 answers
27 views

Manufacturing/Production of Spherical Lenses

How are spherical lenses cut out using a diamond tip? In this video, the lecturer says: Take a piece of glass, mount it on a rotary stage. Then bring a diamond tip near the glass and start rotating ...
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34 views

Measure a 5cm Cube's displacement with sub-micron accuracy within a small position uncertainty 20cm away

The 5cm cube in the question is a place holder in terms of geometry for what we want to track and measure its displacement. The problem is quite simplified with that we know already the cube is put in ...
0 votes
3 answers
88 views

How simultaneous can we trigger multiple cameras' frame acquisition

Say we have ten cameras surrounding an object. The object changes its color with a certain frequency (or any information other than color, such as a text on it). The point is if all cameras are ...
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0 answers
30 views

Is there any small laser tracker optimized for small workspaces

A conventional laser tracker is usually large, but allows measuring up to a couple of meters away with great accuracy. However, if we are only interested to measure a target that is only a few ...
0 votes
0 answers
39 views

3D displacement measurement of a small object with sub-micron accuracy

Say we have a small object for which we can choose its geometry and material (e.g, a spherical mirror with 5mm diameter). Or alternatively a point wise light source generating spherical waves. The ...
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0 answers
45 views

How can I make a 48x microscope with combination of lenses?

As part of a project I need to make a device that can give me 48x magnification of nearby objects. Can someone guide me on how to practically approach this problem, i need to be able to take pictures ...
0 votes
0 answers
28 views

How to get a clear Fourier plane image using convex optical lens?

I am trying to get a view of the Fourier optics plane using home apparatus as follows: I am able to get the inverted image easily by adjusting the distances just right, but I am never able to get a ...
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0 answers
34 views

How can I transport sunlight (with UV, IR etc...) across space?

I currently have a tiny vertical farm which I am trying to make as energy efficient as possible. A big chunk of my power consumption comes from LED lights which are powered by solar panels/batteries, ...
0 votes
1 answer
30 views

Detecting laser spot positon

I have a pulsed laser (532 nm, 250 ps) operating with a period of 20 μs. I need to detect the location of the pulses in a 100 × 100 mm area with 5 mm resolution. Being a complete novice to the field ...
1 vote
0 answers
53 views

Red Laser Safety Filters?

First of all, apologies if this is the wrong SE site. Last year I bought a k40 laser cutter and it came with a square orange/red acrylic safety filter, which is meant to be used for looking through ...
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2 answers
103 views

How to solve transient heat conduction equation at a point in space with volumetric heat source?

My system is a fluid exposed to light and I want to calculate the temperature change with time at a point, hence there are no spatial effects or convection due to the flow of the fluid. The heat ...
0 votes
0 answers
18 views

How to filter out light entering bayes filter

I am trying to run an experiment where I have green fluorescent beads that absorb 490nm light and when excited, emit light at 515nm. Right next to it, I have brilliant blue light that absorbs ~620nm ...
0 votes
1 answer
77 views

Diffusing a Laser beam

I am working with a variable power laser system that has a wavelength of 0.8μm – 1.1 μm. The laser set up in the lab must be able to weld any gauge of material together for the experiment to take ...
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0 answers
57 views

Optical diffuser design

I have a small 3D printed SLA box, about 3.5" x 2.5" x 2". Here is the bottom half: And the top half with an LED inside, facing down, placed off-center, about 1.75" above the &...
2 votes
1 answer
110 views

How solid state lasers work?

In solid state lasers a light source pumps the medium, which is a crystal. A crystal is excited and emits infrared light, until then everything is clear. What I want to know: after excitement, what ...
1 vote
2 answers
148 views

How to digitalize a UV image (create an array of the light output at the pixel level)?

I would like to display an image onto a screen using a digital light projector and somehow record the amount of light the screen is receiving from each pixel. I have thought about using a visible ...
10 votes
2 answers
3k views

Can a very bright light attract an incoming laser guided weapon?

I would like to know if a very bright light will attract an incoming laser guided weapon such as a laser guided missile. Say for example that a tank has a six-foot pole on the top of it and attached ...