Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [photonics]

21 questions
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3 answers

LED Lumen Calculations

I am using an LED as a point source for a school project. I have two questions in regards to the LED(s). I know that light follows the inverse square law when measuring perceived brightness, but all sources I can find show examples of a round bulb…
Klyer Norman
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6
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5 answers

Can all electromagnetic spectra be focused like a laser?

Lasers have a wide range of applications, but can be very costly to produce at high power/intensity. Since light is nothing more than a narrow band of the electromagnetic spectrum, it makes me wonder if the same high power/intensity applications…
Paul
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4
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1 answer

Focusing light from a laser shot into one point

I'm planning to build a laser shooting target. Something like this: In the long term I want to build something advanced like a professional grade target, in which the user is able to tell exactly where was the shot, but for now I'd be happy with a…
SOMN
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2
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0 answers

Comparison of beam divergence between laser diode and DPSS laser

I'm currently comparing a pulsed laser diode and a pulsed DPSS laser. For the DPSS laser, the beam divergence is listed as "beam divergence (80% of total energy): $<4 \text{mr}$". The laser diode is said to already be collimated, and has a beam…
The Pointer
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2
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1 answer

What are some examples of laser-based additive manufacturing techniques?

I'm trying to research additive (or 'bottom-up') fabrication techniques that rely on lasers or other advanced photonic systems. So far, the most prevalent technique I've come across is two-photon polymerisation, but I'm struggling to find any…
Jack R-G
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1 answer

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 condition that round-trip (two bounces) light must…
banjoeschmoe
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3 answers

Calculating Temperature of an Optical Fiber

Let's say there is 30W of light pumping into the fiber. Parameters: Length of Fiber: 6cm Input - 30 W Output -29W Loss of 1W The diameter of optical fiber is 0.25mm. Since the optical fiber is extremely light, using this method to calculate the…
Dugong98
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1
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1 answer

Heat loss in Optical Fiber

I am conducting a thermal analysis of optical fibers. ( Software used AutoCAD Fusion 360) The Inputs conditions are : Let's assume an input power of 1250W, with an efficiency of 98%. 2% loss which becomes heat. (25W) The internal heat of 25W at the…
Dugong98
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1
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Calculate the temperature stability of wavelength demultiplexer

Hi ive been given this question: A wavelength demultiplexer (DMUX) used in a DWDM communication system has a channel spacing of 100 GHz. The operating pass band of each channel is 50 GHz. The transmission wavelength response of the DMUX depends…
jilkie
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2 answers

Epoxy that can withstand up to 800C and is optically transparent?

I'm looking to use an epoxy in a high-temp environment like 800C, and one that is optically transparent at 450nm (not below 90% transmission). But i'm having trouble finding one. It can be made of any material, as long as it can be cured in a mold.
Dina
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Illumination properties of black lights

An elderly friend of mind whose eyesight is fading recently asked me if there was a way to illuminate her new induction stove top so that the "burner rings" would be easier to see, to her it just looks like a big black non descript surface. I was…
Fred Paine
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0
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0 answers

SU-8 2000.5 on Silicon wafers

I have an issue with SU-8 2000.5. No matter what I do, I cannot get it to adhere properly to silicon wafers (Si). Unfortunately, the adhesion is nowhere near as strong as it is on glass, and this is causing significant problems. I’ve tried cleaning…
Sajadi
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3 answers

How to approach photonics related research works?

I am a student in sophomore year in a college pursuing electrical and electronics engineering. My college offers chance to major in any of the 3 sectors of this department which are: 1)Electronics and photonics 2)Communication and signal…
MSKB
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1 answer

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 implement air as a layer in 1D photonic crystals but…
Dead Scissors
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AutoCAD: Help with exporting micrometer details to PDF

I'm using AutoCAD and am trying to export a photolithography mask to a PDF file so it can be viewed and shown to others outside of the AutoCAD program. I'm having trouble with this, as whenever I export it to PDF, small details don't come out in the…
thatguyontv
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