Questions tagged [lasers]

Questions related to lasers, laser-based systems or devices, and their applications.

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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
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 ...
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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 ...
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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 ...
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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 ...
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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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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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?
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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 ...
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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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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 ...
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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
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?
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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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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 ...
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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
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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 ...
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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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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 ...
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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) ...
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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 ...
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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 ...
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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, ...
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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 ...
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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.
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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 ...
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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
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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
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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. ...
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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?
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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
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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 ...