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Questions tagged [laser]

Is the acronym Light Amplification by Stimulated Emission of Radiation. Can refer to Gas, electrical, or chemical lasers.

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Powering on a laser diode that exceeds PSU max current

I have a laser diode that I want to test (just seeing if it turns on). However, the threshold current is past the 10A that my bench power supply can supply, hence I can't generate any light. How can I ...
AnttiP's user avatar
  • 209
0 votes
0 answers
43 views

Issue with Gain Compensation Circuit in MLD203P1 Laser Driver

I am experiencing difficulties with the gain circuit of Thorlabs' MLD203P1 laser driver. Despite adhering to the datasheet and evaluation manual, my laser diode is burning out, and the current ...
Polymath's user avatar
17 votes
5 answers
3k views

Can two interfering light beams create radio waves?

Two sound frequencies differing in only a few hertz can create ‘beats’ and this has been popularized in music designed to produce ‘binaural beats’. Can two lasers be tuned in a similar fashion so that ...
aquagremlin's user avatar
0 votes
0 answers
29 views

Better switch/mux type for laser diode

I recently designed and tested a laser driver board which can generate max 200mA current. One of the requirement was to be able switch that current source between 4 laser diode channels. I used ...
Derun Karabeyoglu's user avatar
-1 votes
1 answer
83 views

Creating a circular laser beam projection [closed]

I’m looking to create a small device (<5 in.) that will project a circular beam around it, a certain distance away from the object. The goal is to have a laser/projector module/something at the top ...
drew wood's user avatar
  • 239
1 vote
1 answer
235 views

Replicating this analog laser diode driver

I'm working on an RGB show laser and currently am figuring out what to do for the laser drivers, as they need to be modulated with a 0-5 V analog signal. There are ones for purchase but are pretty ...
lostbeam488's user avatar
2 votes
2 answers
204 views

The functionality of a driver circuit

I was requested to make a laser driver circuit for a course project. After some research, I found this circuit. Can someone explain how this circuit works? What is 1R (R5&R6)? Can it be replaced ...
Mu'men Yasser's user avatar
8 votes
3 answers
2k views

If we increased the frequency of HV-AC lines, could we get atmospheric air to excite and illuminate?

I had a thought experiment I wanted to run past some experts. It starts with CFL light bulbs. CFL light bulbs are light bulbs that use ~500 VAC @ ~20 kHz or more to excite a gas in a light vacuum. ...
tuskiomi's user avatar
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1 vote
0 answers
103 views

How to design a pulsed laser driver circuit?

I want to try a simple theoretical design of a pulsed aaser rriver circuit according to what specified in this guideline from LASER COMPONENTS. Since the guide is not exhaustive, I'd like to get some ...
Kinka-Byo's user avatar
  • 3,550
0 votes
1 answer
86 views

How to properly calculate current limiting resistor for unknown part?

Newby question here ;) I have pulled apart a kids toy containing a small laser. The laser part doesn't have any partnumber on it, so I did some measurements on the actual device. Please note that I ...
Mar Tijn's user avatar
  • 103
1 vote
0 answers
65 views

Impact of laser current source noise on RIN (relative intensity noise)

I am trying to specify the noise requirements for a constant-current source that would drive a diode laser with a certain relative intensity noise PSD. Lasers typically behave as forward-biased ...
chrisp's user avatar
  • 46
1 vote
1 answer
112 views

Arduino's impedance in breadboard circuit

(Warning, as this is a long question, asked by students that don't know what they're doing. Perhaps our questions are too general and can't be answered but at this point we'll take all the help we can ...
Emmannuelle_Legolas's user avatar
1 vote
0 answers
36 views

Laser characterization setup

I was trying to design a setup to measure a laser beam's wavelength and (hopefully) its intensity (\$W/m^2\$). I mainly plan to work in the visible spectrum with intensities between 200 and 900 \$W/m^...
Arturo Ruiz's user avatar
0 votes
1 answer
89 views

IR laser detection

I'm currently trying to characterise a NIR 940nm laser device that I have recently made. The main thing I want to achieve is to see if the laser is truly doing what the enable signal told it to. I ...
Boan Fang's user avatar
0 votes
0 answers
35 views

Will the laser beam of a laser printer make the OPC drum more positively charged or more negatively charged [duplicate]

while I was tutoring students about A LEVEL computer science in chapter 3 -- hardware, I found a very interesting question about printer. Some websites say that the laser beam could remove charges on ...
Jack don's user avatar
2 votes
2 answers
257 views

Laser diode stops working after a few runs

I wanted to generate a laser pulse between 1 us and 50 us by creating a simple circuit with a source meter, as I didn't have a laser driver. At the beginning, the setup seemed to work as intended (I ...
user3602697's user avatar
0 votes
1 answer
214 views

Confused with the biasing pins for this laser diode

If I want to DC bias the following laser diode it seems I need to use pin 3 with a current source (drawn in red by me) as follows: Description of the pies are shown below: There is no anode pin nor ...
ty_1917's user avatar
  • 1,016
0 votes
1 answer
255 views

Trouble with laser light alarm system

My alarm system circuit consists of: BC-547 transistor 2.2 kΩ resistor An LDR 3.7 V lithium-ion battery connected with a switch LED light Buzzer Laser light The resistor is attached to the collector ...
Shaurya's user avatar
0 votes
0 answers
96 views

Optical SFP, continuous wave operation

I'm evaluating the suitability of optical SFP modules as a low cost continuous wave source. Is it possible to set optical SFP modules into a CW mode? Can this be done with off-the-shelf racks or is ...
user339443's user avatar
3 votes
2 answers
375 views

Strange copper wire on CO2 Laser Tube

I just purchased a 40W CO2 Laser Tube. I noticed there is a weird stray copper wire coming out from the negative anode that is looped and tied around the lens frame. Can anyone explain what this is ...
emtinkerer's user avatar
3 votes
2 answers
171 views

How can I detect when football passes through a hula hoop?

How can I measure whether a football passes through a hula hoop? The main challenge is the need for outdoor use, which presents difficulties due to the presence of ambient light (sunlight). It might ...
FPSX V's user avatar
  • 31
0 votes
1 answer
62 views

How do I implement accurate distance measuring to ground on a rover? [closed]

I need the end effector to always be at a fixed distance from the ground (for example 10cm.) I know little or nothing about sensors and therefore I don't know which one is the best to use (ultrasound, ...
invokeseth's user avatar
1 vote
1 answer
941 views

Is it possible to plot an equation in LTspice? I am supposed to plot an equation like this v(t)=d/dt(ln(pout(t)) + kPout(t)

In the equation mentioned above, Pout is the voltage at some output node in my schematic. Is it possible to plot the above equation? how to plot v versus time?
L1234's user avatar
  • 47
0 votes
0 answers
137 views

Strange noise in analog laser pulse detection circuit

I have a laser radiation detection and amplification circuit board. Its schematic is not available due to property restrictions. I made an attempt to analyse and reverse engineer the board. I ...
kakeh's user avatar
  • 614
1 vote
0 answers
128 views

How to control the galvanometer scanner and XYZ stage to work synchronously via software?

I have a laser galvo scanners and XYZ stages. They are controlled separately by a servo control card and a galvanometer control card, and each performs well when working alone. Now I want to combine ...
Martin Zhu's user avatar
4 votes
6 answers
948 views

How can I make a constant current source for a CW laser diode?

I need to power a single CW laser diode with a constant current source. I have attached the datasheet of the laser. It is a 2.2-2.4V laser whicht operates at 80mA at full brightness. I see a lot of ...
leon bouman's user avatar
3 votes
1 answer
270 views

What is equilibrium carrier concentration in a semiconductor? Is it material specific? How to calculate it?

Is equilibrium carrier concentration dependent on doping density? If it is, then how to know how much the doping density should be for a particular semiconductor device?
L1234's user avatar
  • 47
0 votes
2 answers
182 views

Control laser pointer on/off from external switch

I want to hook up leads to a laser pointer so that I can control it using an external switch. The goal is to turn the laser on/off using a MOSFET connected to an Arduino. The battery contacts are ...
Geoffrey Falk's user avatar
0 votes
0 answers
1k views

Building a long-distance laser rangefinder

I’ve started a new project last week, something that I had had in mind for a long time: building from scratch a long-distance laser rangefinder. Unfortunately, after going through all of google, the ...
John Pilly's user avatar
0 votes
1 answer
62 views

Normally on at NMOS transistor to control another circuit

I need to design a custom board with the ability to control interlock of the laser mechanism. First of all, I have the product X with could get control from another circuit, this pin connect to ...
Knowledge's user avatar
  • 443
0 votes
1 answer
92 views

DVD laser on metals [closed]

What metals can be heated using the laser diode from a DVD? I tried on plastic and wood and they warmed, but I need some metals that can heat up to at least 20°C. How much optical power can the laser ...
A . K.'s user avatar
  • 1
1 vote
0 answers
38 views

Does flowing or turbulent air affect gas sensors such as PM2.5 Laser dust sensors and NDIR sensors?

My project is to place a laser dust sensor to detect PM2.5 and an NDIR gas detector on a drone to measure air quality. My understanding is that these sensors work by shining a laser through a channel ...
coding_guy69's user avatar
5 votes
3 answers
590 views

How to interpret this type of dBm?

I have encountered a spec of a laser diode given in dBm/nm instead of dBm: If I want to know the average power between 2065nm and 2075nm, would the integral of that section give the average power in ...
user1245's user avatar
  • 4,333
0 votes
0 answers
49 views

Common high power diode driver architectures?

I want to design a circuit to drive a noise sensitive, high power (~2A @1.5V), laser diode. What are the most common drive architectures that commercial laser companies use? Buck converters, linear ...
Andrew Reardon's user avatar
0 votes
3 answers
128 views

Why aren't there displays which explicitly emit certain frequencies?

Rather than building displays that emit RGB, why not build displays that emit certain frequencies instead? What are the technical challenges of doing this?
JobHunter69's user avatar
6 votes
1 answer
1k views

Photodetector for short laser pulse

I'm looking at building a detection system for fast laser pulses (532nm wavelength for 250 ps duration). It seems to me that this will require a very fast photodiode with sub nano-secind rise time. ...
Thomas Holle's user avatar
0 votes
1 answer
115 views

How to drive this specific laser

I've done just a circuit to drive an old laser and it was like this one: I was wondering if it could be suitable for driving the laser whose datasheet is reported below. I have these requirements: ...
Kinka-Byo's user avatar
  • 3,550
11 votes
1 answer
2k views

What is the technical difference between audio CD-R(W) and data CD-R(W) discs?

I just repaired a Sony RCD-W100 CD-recorder and want to test the recorder functionality. The manual 'says' I can only use audio CD-R(W) discs. Never heard of CD-R(W) discs just for audio. On the ...
Codebeat's user avatar
  • 1,367
0 votes
0 answers
89 views

Feedback from a 100 W laser power supply

I built a 100 W laser cutter from scratch using a controller from a small laser cutter I had before (Open Builds Blackbox 4x). It worked with no problems, but I'm going from a 7 W laser to a 100 W ...
Michael Suits's user avatar
1 vote
0 answers
101 views

Reverse engineering port on laser for rotary attachment

I have a Trotec Speedy 300. It has the ability to control a rotary attachment by plugging it into a 12 pin Molex port inside the printer. The attachment costs over $1500 plus shipping from the company ...
Ben Crawford's user avatar
0 votes
0 answers
117 views

DVD burner laser identification

I just disassembled the DVD writer from a laptop and scavenged some parts. Around where the laser and mirrors and opto stuff are packed together, I extracted these parts. Which one is the laser diode ...
Elementronics's user avatar
0 votes
1 answer
127 views

Photodiode Current Calculation for Simulation

I am designing a transimpedance amplifier and was trying to simulate the circuit to study its characteristics. I came across this online design tool provided by Analog Devices that builds the ...
Kailash Kumaravel's user avatar
-1 votes
1 answer
71 views

Identify Component with Markings

I can't identify this component.
Radek Matějka's user avatar
12 votes
1 answer
711 views

What are the ways in which semiconductor-grade neon is critical for manufacturing?

This is a question about material use specifically in semiconductor manufacturing. CNN's Ukraine halts half of world's neon output for chips, clouding outlook begins: Ukraine's two leading suppliers ...
uhoh's user avatar
  • 3,439
0 votes
1 answer
267 views

High frequency photodiode laser receiver strange output

We've built this transimpedance amplifier circuit to receive 10kHz pulses from a laser. The laser is driven by a square wave signal generator and is pulsing correctly. We expected to see a square wave ...
Zayd A's user avatar
  • 13
0 votes
1 answer
75 views

How to track, measure, manipulate and/or synchronize the phases of trapped ion qubits [closed]

I am working on a simulation of the Honeywell trapped ion quantum computer. The papers say that it tracks the phases of the qubits using "opto-electronics" but it doesn't give any detail.
Anna Naden's user avatar
0 votes
1 answer
78 views

How to score glass to shine straight horizontal laser line through [closed]

I’m trying to make a DIY laser level, I took apart a cheap one to see how to shape a laser spot into straight lines, it turns out that a simple laser beam passes through a small piece of glass (or ...
ThePolarCat's user avatar
2 votes
1 answer
1k views

Connecting laser diode to a driver

I'm attempting to connect an infrared laser diode to a laser diode driver circuit. I'm inexperienced with electronics and am having difficulty interpreting the technical information of my parts. The ...
lars's user avatar
  • 23
1 vote
2 answers
142 views

Modulator in lasercom: from theory to practice

Hello everyone! We are working on a realisation of an optical modulator and have a doubt. Mr Noel Miller posted already a question, but it was suggested this community. I will repost his question ...
Anna Koroleva's user avatar
0 votes
0 answers
41 views

What are the ramifications of the existence of this "modulation rate" for the use of these lasers for interferometry?

I'm looking for a specific type of laser for interferometry experiments. There seem to be a lot of 1550nm fiber-coupled DFB laser diodes on websites like Alibaba. This seems to be because they are ...
The Pointer's user avatar
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