Questions tagged [lasers]
Questions related to lasers, laser-based systems or devices, and their applications.
40
questions
0
votes
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 ...
0
votes
0answers
35 views
nd yag laser not firing help?
I have an nd yag laser that stopped working during use. The actual laser 'gun' has stopped firing (no light coming from laser tip(you used to see a flash from the 'gun' body itself too)).
I have ...
0
votes
1answer
24 views
Laser engravers and focal points
If I understand it correctly in a CO2 laser engraver/cutter the laser itself is fixed in position and mirrors are used to redirect the laser to the material.
Is there some mechanism used to keep the ...
0
votes
1answer
37 views
How do i measure the time taken for a laser to cut a metal?
I am a placement student and was given a project asking to measure the time taken for the laser to cut a metal and send it to Excel into a spreadsheet automatically. I am a computer science student ...
0
votes
0answers
10 views
How would measuring the number of photons on a finite number of pulses break coherence of a weak coherent laser source in COW QKD protocol
I' m trying to understand attacks on Quantum key distribution protocols. In the COW QKD protocol, pulses from Alice are passed through an asymmetric
coupler and a fraction 'T' of the photons are sent ...
1
vote
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?
0
votes
1answer
92 views
Scalable alternatives to CNC router and laser cutter
I am doing calculations on costs for alternatives for manufacturing this children's toy I invented, a puzzle where letters in plastic fit into wood:
I have been using a CNC router to carve subtract ...
0
votes
2answers
28 views
Calculating energy loss from laser when shining through a material
When attempting to trap a particle in a laser beam i was able to achieve the effect.
Pretty cool but now when i put of piece of plexiglass that is 1/8” thick i can no longer achieve the effect. The ...
0
votes
1answer
46 views
Trapping a particle in a laser beam (optical tweezers)
So upon watching videos and reading articles i understand few things. For one when the laser beam is focused to a tight enough point when placing a material in there (people use crayola markers) it ...
2
votes
1answer
47 views
How 2 lasers interacting causes a dot of light
Take a loom at this diagram
You have probably heard of this before but im just curious what laser they are using to do this. They do t appear to be ionizing air. It seems the one laser is just for ...
-1
votes
1answer
88 views
Why is making a white laser so difficult? [closed]
There are red, green, and blue lasers out there but i can't find a white laser? how hard is to make one? Is it possible?
1
vote
4answers
63 views
Why are fine metal filters made of meshes?
Given that we have mechanisms of performing photolithography at 10nm, why are metal filters often meshes? Wouldn't it make a lot more sense to buy a single chunk of metal, and use the UV lasers to ...
1
vote
1answer
781 views
What is best sensor & method to measure human height?
My application needed to measure human height on a standing kiosk. I need to attach the sensor on kiosk ceiling type top. I used different kind of ultrasonic sensor for this purpose but nothing ...
0
votes
1answer
24 views
Suitable laser for Engraving
I have made a CNC machine from CD drive and want it to use for engraving purpose. which laser would be best for this job?
3
votes
1answer
41 views
Tea nitrogen laser debugging
I am making a tea nitrogen laser based off the rimstarorg youtube channel. I have a perfect setup as seen below
I use 11, 1kv diodes to convert my 7,500 volt lug on my neon sign transformer to DC. My ...
0
votes
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?
1
vote
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 ...
1
vote
3answers
309 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 ...
1
vote
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 ...
0
votes
1answer
53 views
FM transmission over laser
Modulate a laser's wavelength? What are the inner workings of a laser, and is it possible to change the wavelength mechanically? Are there any lasers that can change wavelength?
0
votes
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 ...
1
vote
1answer
58 views
On construction of a triangular interferometer like LISA [closed]
I am planning to do a project in which I plan to mimic the LISA interferometer. For this I use the fabric material, Lycra to mimic space time and use spherical balls, forming a couple and connected to ...
1
vote
1answer
209 views
How the electronic circuit control laser diode? [closed]
I find this scheme here
1 - is data stream come from computer. This 'data' is an electric signal moudulated by the n°2
2 - this is the electronic circuit inside printer that
a) activates the corona ...
5
votes
1answer
515 views
How does a laser printer write with light on the photosensitive drum?
I want to understand how a laser printers laser writes on a photosensitive drum. I am trying to understand this process.
the photosensitive cylinder is illuminated by a laser beam that projects ...
-1
votes
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 ...
0
votes
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 ...
0
votes
2answers
241 views
How do I sense reflective tape such as on a spinning wheel?
I know that the frequency and rotational speed of a spinning shaft or wheel is measured using a device that senses a piece of reflective tape on one of the rotating components. I am thinking a laser ...
2
votes
2answers
324 views
How does the Michelson interferometer measure the self-coherence function of coherent light in an incoherent background?
How does the Michelson interferometer measure the self-coherence function of coherent light in an incoherent background? Detection of coherent light in an incoherent background (Coutinho et al., 1999) ...
1
vote
1answer
1k views
Is it possible to reduce the divergence of a red laser pointer beam from 40 degrees to 1 degree?
I would like to find out if it is possible to reduce the divergence of a red laser pointer beam from 40 degrees to 1 degree.
@Ruslan wrote on October 3 2013 that because the active zone of a ...
2
votes
2answers
275 views
How to handle reflections when cutting metal with a laser?
I have heard of lasers being used to cut metal, however all laser cutting machines I've found can't cut metal, I'm guessing because it reflects the light?
What is different in the designs of such ...
7
votes
2answers
889 views
Metal micro perforation
I'm trying to design a metal surface with micro-perforation for a product and light it from other side with LED, such that the perforated pattern appears only when lit.
In my previous prototype, ...
0
votes
1answer
135 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 ...
4
votes
1answer
304 views
What is the accuracy of direct metal laser sintering (DMLS)?
They've printed jet engines with it that work after polishing. So how is the accuracy measured and how accurate is the DMLS process? I can't find the required info anywhere.
4
votes
1answer
4k views
Difference between continuous wave laser and a pulsed laser
I understand the difference between the two in terms of how they function; one will release all of it's energy in small pulses with the other creates a constant stream of radiation.
My question is ...
-2
votes
2answers
761 views
Is it possible to use lasers to build tunnels instead of mechanical digging machines? [closed]
I know lasers can cut or create holes on some hard materials such as diamond and metals. Is there any similar concept in tunnel engineering?
If not, what are the difficulties?
5
votes
1answer
628 views
How to measure a laser diode's Wavelength
I have some laser diodes. I want to know how to measure the wavelength of laser diodes ranging from visible to near infrared? (300 nm to 1100 nm)
What type of instrument/meter do I need to use? ...
5
votes
1answer
158 views
Laser diode input/output ratio
I am a photo technician working in photographic labs to repair printing machines.
I am trying to better understand how these machines operate.
Blue laser gun
Laser gun type = 473 $nm$ blue dpss.
...
-1
votes
1answer
123 views
What is the “10/100/1000 BASE-T” laser/transceiver rate unit signifying?
I'm using a 10/100/1000 BASE-T fiber transceiver.
What does this mean?
6
votes
4answers
473 views
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 ...
14
votes
2answers
514 views
Why are lasers used for concentrated light applications instead of incoherent light sources?
Some laser applications consist simply of concentrating light into a small spot. Two example applications are laser welding and cutting. In these cases a CO2 laser is often used which needs a ...
