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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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1answer
28 views

Can you focus a 300W LED to a small area?

I want to focus a 300W LED into a small area, about 5mm in diameter, much like focusing the sun's rays with a fresnel lens. I have to be like 2 meters away from the LED to focus the LED light with a ...
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0answers
20 views

Shrink a laser spot size

I have a laser where I can adjust the focal length, however it has a large spot size. I am trying to shrink that down significantly with a microscope objective, how can I go about doing that? Should ...
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0answers
8 views

How to calculate new focal plane position when adding a lens to a lens system?

I am currently struggling with some lens equations. I hope this is the right place to ask such questions. What I'm trying to accomplish is to add a separate single lens to a camera setup and ...
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0answers
21 views

What is a common polarizing 50/50 beam splitter cube coating

I am having problems locating references of the typical thickness and material of the coating along the hypotenuse side of 50/50 polarizing beam splitter cube. Does anyone know what these coatings ...
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0answers
12 views

How can I determine the optics needed for a desk microscope?

As an noob to microscopy, photography, and optics in general, I'm trying to figure out if I can use the KPPACE KP-2100 camera as a desk electronics microscope. I want something I can mount to the ...
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2answers
45 views

What's the difference between pulsed lasers and frequency combs?

Can you please explain the difference between high-energy pulsed lasers and frequency combs?
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13 views

WDM with a channel spacing of 10 nm?

I'm looking for a wavelength-division multiplexing (WDM) that offers a channel spacing of 10 nm to 15 nm, for center wavelength (1521, 1531... 1610). Do you think such WDM filter is possible?...
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1answer
65 views

Relations/Equations to do with light diffusing materials

I recently started as designer at a making custom signage (small signs viewed up close, so there are lots of sizing limitations) and none of the other designers have any solid rules to rely on for ...
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0answers
14 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 (...
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1answer
28 views

What is the theory behind imaging a precision pinhole?

In my efforts to characterise a 0.67 NA microscope objective (working distance of about 15mm, effective focal length of 25mm), I have placed a 20 micron precision pinhole at the focal plane of the ...
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1answer
49 views

What lens is needed for a retina scan?

I was originally planning to as this on Physics Stack exchange, but found this question while searching, which directed the asker to here. While my question is not a duplicate of that, it still falls ...
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2answers
44 views

Electron micrographs, is it showing electrical charges?

Are electron photographs showing electrical charges? Do electrically charged parts show up more (darker in the photo) ?
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0answers
13 views

Gradient of refractive index at very short distances

I have only taken standard (basic) level math courses in high school and had learned only the fundamentals of wave and ray optics in physics classes. Therefore, Im asking only for a very general ...
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1answer
24 views

How to adjust magnification when mounting camera on microscope

I apologize in advance if this is the wrong site for this question. If this is the wrong site, would some kind soul point me towards the correct site? I have a couple of Vision Engineering TS4 ...
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2answers
32 views

What attributes of a surface are relevant to light sensors? [closed]

I'm doing a study on surfaces and I would like to describe all of the surfaces that I expect to encounter in the field and determine which ones will be the most difficult to detect. To do this, I need ...
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2answers
100 views

How to construct a compact linear Fresnel reflector

I have recently come across the concept of CLFRs, and I want to build one myself, as a private experiment. I have a rudimentary knowledge of optics (which I'm sure I'll have to refresh on) - any ...
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2answers
66 views

Would connecting 100's of small telescopes into one huge telescope make for a significantly better telescope?

Not sure if this is a Physics related or Engineering related question, but imagine that we would take 100's of small hobby telescopes and somehow managed to point them all at the same point in the sky ...
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2answers
195 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 ...
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1answer
98 views

rotating mirror system for shifting a beam?

I am looking for some mirror setup where rotation one or more elements in the mirror setup will allow to shift the beam along its axis. Two mirrors in a galvanometer scanner type setup work well for ...
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1answer
168 views

how to implement autofocus for video projector

I have a modified pico video projector that I need to add an autofocus to. The focusing ring already has a fast stepper motor added to it. If the focus had to be done on the middle of the projection ...
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1answer
58 views

Can I use an optical fiber to direct a laser cutter? [closed]

Specifically, a 100W CO2 laser. Are there any considerations other than the maximum power for a fiber?
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1answer
53 views

Are DVD laser diodes single transverse mode?

I am looking for a cheap source of low power single transverse mode laser diode in order to focus them to a very small point. I thought I would get that from a DVD drive but the pattern I see at the ...
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0answers
69 views

how do tilt-shift DSLR lenses and video projector lens shift lenses work?

For photography there are tilt-shift lenses. For video projectors there is lens shift lenses. With video projector lens shift I get perfect, undistorted video projected up to 100% above, below, left ...
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3answers
313 views

How can I build a micrometer diameter laser beam from a common laser diode?

In order to build a lighting system for a microscope (with a digital camera) I want to make a very small diameter laser beam (parallel, rather than convergent). If possible around 1 um diameter. How ...
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0answers
33 views

What optics system can create an image both smaller and further away from the system than the source object?

My system comprises of: a light source, a set of lenses, a projected image of the light source. I want the projected image to be both further away from the lenses and smaller than the source. Which is ...
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0answers
22 views

Where could I find, or what is a material that could be used with 30 GHz pulsed DC current to produce 30 GHz pulses of light?

I need to produce pulses of light that turn on and off for equal intervals at 30 GHz. I know there are lasers that are capable of this frequency, so I need to know what materials they use to produce ...
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1answer
201 views

How can I detect black spots?

I am researching about ways to continuously determine black spots (size 50+ micron) in our product stream. This stream consists of imperfect spherical polymer beads (size 3 mm) of different materials (...
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0answers
31 views

Use Fiber microscope to view micron sized particles

Can I use Fiber microscope to see micron sized particles? That's mean, can Fiber microscope be used as a typical optical microscope? Generic Handheld 400x Fiber Optical Microscope Inspection
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1answer
33 views

Is it possible to measure x & y displacement components with a single point (out-of-plane) vibrometer?

Originally I was going to use accelerometers, but they are to big for the disk I'm trying to measure. Basically I have a set of planetary gears for which I need to measure the vibrations in the x and ...
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2answers
52 views

Optical methods for reaction engineering

What optical methods can be used to measure the concentration of reacting gases in a packed bed reactor during an exothermic and fast reaction? I need to monitor and measure the local concentration of ...
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0answers
103 views

How to get a brighter, sharper image from a projector lens

I  am trying to make a homemade projector using my phone. Screen size 5.5 inches, focal length of lens is 20 cm, diameter of lens is 6 cm. The problems I am facing are: the edges are distorted; the ...
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1answer
47 views

Device that emits a safe beam of light - doesn't have to be visible (Like laser, but safer)

I am looking for a light emitting device, which can produce a narrow and accurate beam, with a small "dot" size, for a significant distance (around the 100-150 meters) similar to that of a laser, but ...
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2answers
50 views

Can we see a nanowire?

Can we see a nanowire, whose dia is say 1 nm but length is 10mm, with naked eye? To see an object does at least two out of three dimensions must be greater than the minimum size one's eye can see?
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1answer
231 views

Design of Compound Elliptical Concentrator and Compound Parabolic Concentrator

What is the process in design a Compound Elliptical Concentrator and Compound Parabolic Concentrator if I wanted to achieve 100% optimal concentration ? Let's assume random numbers of: A light source ...
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0answers
2k views

Matlab code for a visible light communication system

I simulated a VLC system for an AWGN channel and plotted the BER against Ebno. I used the LED impulse response and convolved it with the signal produced to transmitting. But the results are not OK. It ...
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2answers
77 views

How might I see through a completely solid plate of steel worn as a mask?

I have a solid plate of steel I need to see through, as a mask. I need a wide FOV (at least 210 degrees). I cannot have any obstructions in the image, so no pinhole meshes or anything like that. ...
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1answer
901 views

How to see through an opaque mask?

I have a face mask that I'm planning on making, a cosplay of Wrench from Watchdogs 2. Not satisfied with existing ones, I want to go for a more realistic one. That being said, this requires that I ...
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0answers
414 views

How do LED traffic light diffusion lenses work?

In my area traffic lights with bulbs are being gradually replaced with LED traffic lights. Sometimes these lights have no diffusion lens and the individual LEDs can be seen. Other times the lights ...
2
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1answer
171 views

How to focus the flashlight of a smartphone?

How would I go about collimating the light from a smartphone's flashlight into a more focused beam? I'm working on a project where I need a focused beam of light to act as a light source so I can take ...
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2answers
107 views

Are thermal (LWIR) lenses as capable as visible-wavelength optics?

I'm trying to figure out whether lenses for thermal (long-wave infrared, i.e., 7-14µm) cameras are inherently more expensive or less capable than the lenses for visible cameras. Production lenses ...
4
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2answers
498 views

Periscope camera with a mobile phone, how to make walls not visible on the camera/alternative solution?

I am trying to make like a "periscope" that i can use with a mobile camera. I have made a very quick prototype with two mirrors and it "works" but you can see the interior of the walls so it is not a ...
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3answers
3k views

Why aren't screens round instead of rectangular?

Screens on TVs and phones et cetera are always rectangular. Why? Why are they not round? Eyes are round. The Sun, the source of almost all of our light, is round. Telescopes have round lenses and ...
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1answer
37 views

Reusable 100um x 5mm flow chamber

I'm building a small microscope through which I need to pump fluid samples to image. Currently I'm using a flow chamber from Ibidi that is perfect (length of a standard microscope slide x 5mm x 0.1mm)...
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1answer
161 views

Is it possible to adapt the design and principle of operation for a tunable microwave photonic notch filter to a visible light photonic notch filter?

I just read the 2015 excellent paper , "Tunable microwave photonic notch filter based on sliced broadband optical source". Is it possible to downconvert a microwave photonic notch filter to a visible ...
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1answer
66 views

How is an digital coherent receiver able to achieve 100 Mhz line-scan rate for detecting coherent light in the presence of incoherent light?

Recently, I read an October 2006 IEEE JOURNAL OF LIGHTWAVE TECHNOLOGY, article titled, High-Sensitivity Detection of Narrowband Light in a More Intense Broadband Background Using Coherence ...
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0answers
50 views

How to measure the luminance an unevenly lit object?

I need to measure luminance vs angle characteristics of an led lamp. I have access to a lux meter and a luminance meter. The problem is, that the luminance meter can only measure luminance within 1 ...
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1answer
50 views

Flatten cylindrical image using lens [closed]

I want to do something like this: but I have 3 questions that need to be answered: Is it possible to make this kind of lens? If it is possible, what are the equations/measurements needed to make it? ...
3
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0answers
539 views

Optics for a triangulation laser distance sensor

I'm trying to build a laser distance sensor using triangulation (With this as my main inspiration, Webcam Based DIY Laser Rangefinder). My plan is to use a linear CCD array as the imager, such as the ...
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1answer
46 views

Light transmittance of acrylic with temperature

I have a 2 mm piece of UV transparent acrylic sheet. The datasheet defines it as 80% transparent at 300 nm. However, when I use it with different temperatures (4-50°C), the transmittance ...
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0answers
169 views

3D matrix for staggering 5 ten degree wide bands of angle of incidence shifted by target wavelength and optical path difference in arithmetic series

Today, we came up with the idea of creating a 3 dimensional matrix where I simultaneously stagger 3 times 5 times 5 Fabry Perot band-reject interferometeric filters with ten degree wide bands of ...