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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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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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?...
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Are there any laser sensors that have a high accuracy at 200-400 mm with low laser angle? [closed]
I'm looking for a simple laser sensor that has these properies.
Range and accuracy at different reflectance
I recently wrote an unscented Kalman filter in C code and tested it with a VL6180x laser ...
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What does the term "boresight", and what do the phrases "boresight adjustment" or "boresight calibration", mean in the context of laser scanning?
I have been studying the laser scanning literature. In doing so, I often come across the term "boresight", and the phrases "boresight adjustment" or "boresight calibration&...
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Setup for fringe contrast measurement
I am currently reading the Fringe Contrast section of this document. This section says the following:
Be sure to use a DC-coupled detector when measuring fringe contrast. Adjust the interferometer ...
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Lazer wifi connection [closed]
Would it be possible to create a Wifi cable that uses lasers to send information at light speed?
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Laser Power Control Using Duty Cycle
I have a Coherent Cx-10 CO2 laser that I want to use for laser heating of very small samples at high pressure, so I need to accurately control the laser power. I also have a pulse width modulated ...
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Low Current (<500mA) Transient Current Suppression Methodologies
I am looking into possible methods of protecting against small current transients for use with a laser module and am having trouble finding information, partly because I am unsure what exactly to be ...
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Low spread high power laser
I am looking for a laser which can travel about 10 km through air from one end of a lake to another.
It needs to have a minimal spread, i.e. a small diameter spread over the 10 km - less than 10 cm ...
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Build plans for a PSU 13.56 MHz 300 W - 1000 W with adjustable voltage between 200 V - 500 V
This is a kind of continuation of a previous thread Howto: RF HV power supply (13,56 MHz, ~30 kV - 50 kV, 1 kW - 3 kW)
I made the assumption that the voltage for exciting plasma with DC co-relates to ...
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How to calculate laser power on photodiode?
I am completely lost calculating the power of a laser diode and hope, that someone could help me.
Here is my setup:
OSRAM PL 520 (Type B1 = 50mW) Green Laser Diode
OSRAM SFH 203 Photodiode
The laser ...
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Can an LED be used as a receiver and as an emitter?
I have this idea but I do not know if it makes sense. The idea is to use a red transparent LED connected to an input of a microcontroller. In parallel it is also connected to an output of the same ...
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VCSEL to project a 2D array of dots [closed]
Background
Apple iPhone Face ID uses VCSEL inside its dot projector to project infrared dots into a person face. Then an infrared camera captures the pattern to be used in a structured light algorithm ...
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