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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27 views

Constructing small Kretschmann Surface plasmon set up

I am trying to build a SPR setup at home which is based off this diagram: I wanted to try to miniaturize it and had some concerns about my strategy. So I was thinking I could buy a big prism and ...
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21 views

Entrance pupil in an optical system

I'm challenging my optical design skills by coding a ray-tracing Python script. I know that many good packages exist out there, but I'm trying not to skips steps by building everything on my own. For ...
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Emerging beam from PPLN waveguide not behaving well through optics

We have a pump laser beam that is coming out of a single mode fiber and butt coupled into a PPLN waveguide crystal. We are capturing the beam at the output of the crystal with the focusing lens in an ...
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1answer
51 views

What does “coupling effects” mean in the context of optical systems?

What does it mean to say that there are "coupling effects" between some elements of an optical system? I've searched through the literature, but I cannot find a general explanation of what ...
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24 views

How to convey the image of a 14 mm object through a thiner (8 mm) pipe?

My setup and constraints are the following (see figure below): A rectangular pipe (~50 mm long, section 8 mm). The pipe has an apperture at one of its end, which is larger than 14 mm. A 2D object (a ...
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1answer
52 views

Differential Equation for: Locking a laser's frequency with a PI controller

I think I have a good understanding of differential equations, so I would like to first try to understand my system in terms of differential equations before transforming my system into the more ...
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19 views

Meaning of SNR in Instrument Specifications

I am evaluating the specifications of an FTIR instrument (Bruker Vertex) and came across the following statements/items: Signal-to-Noise 5 sec sample, 5 sec reference: >10,000:1 (<4.34 x 10-5 ...
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26 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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25 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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2answers
82 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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47 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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18 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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34 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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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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33 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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124 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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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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491 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 ...
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51 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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69 views

experiment with interlacing to achieve 3d effect

I am going to attempt an experiment to achieve 3d effect. I read about autostereoscopy on wikipedia. I am trying to do this, I have already processed image in that format. see the image every ...
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1answer
104 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 ...
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1answer
48 views

How is a parabolic mirror made by hand?

So, glassmakers were tasked with building parabolic mirrors for telescopes. I imagine that process is now entirely done in heavily automated factories. How does one make a mirror and then carve it ...
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1answer
1k 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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2answers
33 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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1answer
68 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
50 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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1answer
141 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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2answers
78 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
107 views

What's the widest spectrum a single camera could process? [closed]

I saw this question, which was too broad, and I thought of a more specific question that can hopefully be answered. There are "normal" (visible light spectrum) cameras, infrared cameras, and UV ...
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1answer
196 views

Is it possible to make a tunable coherent light filter with 1.8 nanometer bandwidth for visible light?

On January 1991, the esteemed Swedish professor of optics filed a patent titled "Coherence filter", that blocks coherent light regardless of laser light wavelength using destructive interference and ...
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1answer
21 views

45 Degree Coupler on Fibre Optic cables

I was reading through a research paper and they showed the following schematic: I am not exactly sure what is meant by a 45 degree coupler so I looked online but there is no such thing as a 45 degree ...
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1answer
29 views

Bicycle headlights with different low beam reflector types

What makes second reflector different than first one in terms of efficiency and correct beam distribution (brighter below cut-off line, dimmer closer to the ground)?
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2answers
41 views

What power lasers can be used to heat fabrics to 70 degree Celsius?

For a project that I was building I wanted to heat fabrics to 70 degree Celsius using lasers. Since fabric is a very wide term for now I was looking to draw heat patterns on 100% cotton T-shirt and ...
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2answers
51 views

Compound Microscope recommendation

I am an engineering student. I want to get into microscopy research and bio-science. So I want to buy a fair enough compound microscope. I searched for them and there are so many variants from ...
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2answers
52 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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1answer
31 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
28 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
189 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
427 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
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
84 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
41 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
69 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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1answer
62 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? ...
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13 views

Is there a possibility to shield CMOS-chips from light but still be current sensitive?

Since I am not from the field of physics or engineering, the next question may seem a bit naive. I would like to measure an electric current with a CMOS sensor, which is practically directly applied ...
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1answer
49 views

What is this part of a camera called?

Some cameras have a pattern similar to stairs close to their lens. For example: Such a system absorbs and/or reflects undesired light rays in order to improve image quality. How would you call such ...
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1answer
29 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 ...
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16 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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3answers
362 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
48 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 ...