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
129 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 ...
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0answers
637 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 ...
3
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0answers
173 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 ...
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0answers
129 views

Generating a IES file from an illuminaire and a lens

I have a IES luminaire file of a lamp and some polar candela distribution plots of lenses like: How can I create a new luminaire file combining the lamp with every lens? I could manually sample the ...
2
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0answers
25 views

Home made microscope using donated objective lens and camera-ocular-adapter

I have a bunch of nice objective lenses from an huge old microscope set, and would like to make a microscope body tube with just one objective and one ocular lens. Without using trial and error to ...
2
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1answer
39 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 ...
2
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1answer
129 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 (...
2
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0answers
87 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 ...
2
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0answers
464 views

What optics and display are used in Microsoft HoloLens?

How does Microsoft project an image so close to the eye yet understandable by the brain? How is the display transparent? This link has good information but is speculative. https://www.reddit.com/r/...
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0answers
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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0answers
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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0answers
13 views

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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0answers
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 ...
1
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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 ...
1
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0answers
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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0answers
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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0answers
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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0answers
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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0answers
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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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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0answers
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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0answers
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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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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0answers
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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0answers
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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0answers
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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0answers
14 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 ...
0
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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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0answers
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 ...
0
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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 ...
0
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1answer
58 views

Can waste heat in specific environments be collected into photons and converted to electricity?

This question is a repeat of another post on the physics board Here and here show the possibility to combine photons of lower energy to higher energy. Thinking of an application, it could be used to ...
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1answer
23 views

Connect LED with a 0.25mm fiber optic

I want to connect an LED (940nm signal) to a 0.25mm fiber optic. I have researched some possibilities, which involves using shrink heat tube, which is unfortunatly too large or simply buy couplers. I ...
-1
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1answer
164 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 ...