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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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 ...
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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 ...
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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 ...
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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 ...
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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.
...
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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 ...
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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 ...
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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 ...
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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 ...
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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^...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Is it possible to find the specs on a laser diode with the number on it?
Laser n00b here,
I have a RGB laser for festivals and music events, but only the red laser is functioning, I was hoping to replace the other two, as it's a relatively pricey unit. No luck contacting ...
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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 ...
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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 ...
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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 ...
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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, ...
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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?
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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. ...
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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:
...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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Identify Component with Markings
I can't identify this component.
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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 ...
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Constant current source design considerations
I am designing a constant current source to drive a laser diode.
I need it to be adjustable (from 0 to 100mA max) and stable enough as I will be using it as a light source in a Foucault mirror tester ...
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Why is it that the maximum fringe contrast is observed when the signal mean is half the amplitude?
I am currently reading the Fringe Contrast section of this document. This section says the following:
Why is it that the maximum fringe contrast is observed when the signal mean is half the amplitude?...