Questions tagged [laser-diode]
A type of diode that produces laser light.
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First time building a laser. What power do I put in?
So here's the diode's datasheet.
https://cdn.shopify.com/s/files/1/0549/7500/4823/files/LT-LD-465-4100M.pdf?v=1668835492
I don't know what driver to use, but more importantly, what voltage and current ...
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High-current transients with LM317 LD driver in Falstad
I have been building a laser diode driver in Falstad, but for the first 200 μs there is a current spike of over 70 A! This would mean instant death for my laser diode.
If you are curious the laser ...
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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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Identifying a maybe bad SOT23 transistor
To give a bit of background, I'm trying to fix a friend's NeoGeo CD console which doesn't read disc: The disc doesn't spin at all, the laser assembly and lens are moving, the diode turns on. But it ...
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Confusion with laser diode parameters and I/V curves from its datasheets
I have this fiber coupled laser diode. And its specs given as:
But the datasheet also says it used this particular diode. And the specs are given as:
And the I/V/P curves:
The thing is the first ...
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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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Driver for a CW laser diode
I have a 20mW CW laser diode that I want to control with a microcontroller.
I found that it has to be powered by a constant current circuit so that the power of the laser never changes.
I have been ...
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Can I use an anode-grounded laser diode with a positive supply if it floats?
After my previous question I noticed that the laser diode I have is anode-grounded, meaning that the case (which is the diode's metal case and often connected to circuit ground to reduce noise, I ...
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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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Two laser diodes beat frequency
With a single laser diode, the interference pattern of the light with itself gives a beat frequency of zero.
Given two laser diodes (same wavelength, same manufacturer), the interference pattern of ...
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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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Find a relationship between the input voltage and the current through the diode
So my problem is to, just as the titles states, finding the relationship between the input voltage and the current through the diode for the following circuit.
We have also been given some parameters,...
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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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How to measure the input impedance of a laser diode/LED using a VNA?
It would be nice to have some advice on an issue I'm having with a laser diode. I have a DFB laser diode that has no kind of series resistor connected to it in the package. I want to make a driver for ...
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Can a 5mW laser diode's output be doubled for a short time (5s)?
Friends are using the KY-008 laser transmitter module for a sensing/computer vision project prototype.
They are having issues with insufficient laser dot brightness when their target is lit by direct ...
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Laser diode stand-in for ESD destructive testing
Is there any component with similar ESD sensitivities as laser diodes but with lower cost that can be used as a stand-in for destructive testing of ESD protection circuits? Should I just use MOSFET ...
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What is the purpose of a "monitor diode" inside a laser diode case?
I was looking for laser diodes to buy and I noticed many of them have a "monitor diode" included. What is the purpose of a monitor diode? Would not the current (of the laser diode) be a ...
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How to design an adjustable 5A current regulator with LM338?
I have recently taken interest in laser diodes, and I would like to drive one of them (NUBM08) without destroying it. Looking over the internet I learned there are many devices one can build to do ...
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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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What safety class are these OEM 650nm 5mW laser diodes?
I am looking for some information about this type of laser diode. There is no safety class specified (is this ok?) and are rated 650nm and 5mW power. Is the rating IIIa?
What is the difference with ...
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Recommendations for modulation of VCSEL laserdiode configurations
For my project I need to design a cheap VCSEL laser driver which can be modulated up to 10 MHz. My laserdiode is VCSEL-1550 nm-T (built-in TEC and no monitordiode for APC). Datasheet link is here: ...
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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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How to connect a fiber to a laser module
I need to connect a fiber to a laser module, to make a fiber coupled laser module.
If the wavelength of the laser is 532nm , what is the type of the fiber ?
How can I connect the fiber to the laser ...
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Can I simply adjust the output power of these laser diodes to meet my specifications? If so, then what are the consequences of doing such a thing?
I need a CW laser diode, with an integrated photodiode, with wavelength around 800nm and power 1-1.5mW. Although I didn't find anything that exactly matching my specifications, I did find this from ...
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Are the parameters of pulsed laser diodes adjustable? Does making such adjustments negatively impact the laser diode in any way?
I am currently reviewing pulsed laser diodes from suppliers. The specifications are somewhat unique, so there doesn't seem to be many suppliers that offer what I'm looking for. I require an IR ...
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Laser diode driver circuit analysis help
I'm looking up for some circuitry to drive my laser diode and I came across this tutorial.
I understand the basic operation of this schematic; however, there's one thing that confuses me:
I cannot ...
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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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Tuning current limitation for VCSEL laserdiode
Recently, we have bought a VCSEL laser diode, in which we can vary the wavelength by tuning the voltage and/or tuning current. Also, we got an application note in which it states as follows: "Set ...
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Laser Diode driver circuit help
I'd like to understand the functions of Q2 and Q4 in the driver below. Also, why there's a shunt RC branch at Q5 base? Is Q2 simply a buffer or does something else? Also, in the diagram, it says "...
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Overheating when 4 laser diodes in parallel with 2xAA battery
I bought 10 red laser diodes from ebay for cheap and I wanted to create some art sculptures.
The diodes work fine. I connected 2 lasers together in parallel with 2xAA batteries, and it worked alright.
...
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Driving a 14-pin with DFB laser using D2570H
For our project, we would like to use the D2570 DFB laser from Agere system since it has a built-in photodiode with a TEC sensor, thermistor and a bias-tee embedded in an 'all-in-one' package.
However,...
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What does a table under "Emission Point" label mean in metal-can laser LED mean?
Screenshot above comes from page 6 of this datasheet
That's for OSRAM PLPT5 450KA blue laser diode.
So far I did not have any problems understanding technical drawings, so I suspect this may be a ...
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Troubleshooting my own PCB
I have designed my own PCB and it doesn't work correctly.
I needed to have a PCB that has only one push button to switch on and off a laser diode. The circuit does work kind of, but the laser diode ...
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How to dim one of these cheap 5mW laser modules?
I used to have an old 3x LR44 lithium cell laser pointer for presentations. With the batteries slowly dying, the outputted beam also went dimmer.
Recently I bought one of these cheap 650nm laser ...
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SPLUL90_AT08 Laser Diode issue
Our team now evaluate laser diodes for making LIDAR
At first, we bought SPL UL90_A T08 from digikey
and used lmg1025-q1evm (Ti) board to drive the LD.
We drive Forward direction with 11V (As Datasheet ...
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How to improve a high frequency square wave for laser imaging
I am trying to create a current source for laser direct imaging and I have a problem in the circuit I cannot solve.
The laser is a 120 mW 405nm diode and I use it in a laser module from a laser ...
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Push-pull driver level shifting driving laser diode module
I am driving / modulating a small laser LED module LC-LMD-650-01-03-A (3.3V @ 25mA). My job is to PWM modulate it at 10kHz for 50msec, driving it with DSPIC33CK256MP503 (3.3V) dsPIC processor.
First I ...
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Can optical fiber communication be used to transmit analog signals?
I am confused because I read the LEDs/LASERS used in optical fiber have finite levels. If for instance ASK is used to transmit digital baseband data then will the LED or LASER be able follow the ASK ...
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Do I need a driver for a single laser?
I want to hook up a 9v battery to a laser diode(linked to the ones I will get), but have seen laser drivers scattered across the internet and vaguely have heard of them. Do I need one to use the laser?...
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wiring up laser pointer directly to usb power
I have a red cheap laser pointer/lantern which I'm using to do some experiments. But I find that the batteries have a very short lifetime for what I'm doing, It uses three LR44 button cell batteries,
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How are objects rendered with a MEMS mirror for AR?
This question is an intersection of both hardware and software. I am trying to understand the theory of AR technology, but hitting some roadblocks and cannot find any good online resources that talk ...
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How to power and switch a laser diode?
I am quite new to the Arduino business and up until now managed to create a Hexapod robot from a kit based on the Arduino Mega 2560, add Computer Vision and let him crawl around to find target objects....
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Is it possible to just take a normal (continuous) laser diode and pulse it? Or does this not produce the same effect as pulsed laser diodes?
At the moment, I am planning for a project involving lasers (yes, I have been lectured on laser safety). I am looking for a cheap way to build a pulsed laser in the near-infrared range. Since laser ...
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Problem with laser diode
I have a 1000mW engraving laser module. It was working well.
Unfortunately it suddenly lost its burning power and wasn't capable of engraving anymore, although the laser diode is still ON and ...
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How can I read the current from a monitor photodiode of a laser diode?
I bought a adl-65074tl-1 laser diode, I am trying to drive it and to read the feedback of the monitor photodiode with an oscilloscope. I am using a laboratory DC power supply and a multimeter for ...
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Relation between diodes and laser diodes
I am currently studying Practical Electronics for Inventors, Fourth Edition, by Scherz and Monk. Chapter 2.5 Resistance, Resistivity, and Conductivity presents makes the following claim when ...
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Laser Diode and LEDs in parallel: LEDs don't light
I have a 3x1.5V battery pack (AA alkaline). It's fresh and with no load sits at 4.8/4.9V.
In parallel, I have 3 LEDs, each with their own resistor. That works fine..
I can also switch in a 5V laser ...
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LED Blinking On turn on and off
I made a circuit for LED Driving (current controlling), based on
this circuit. Everything works fine except that the LED is suddenly blinking when the circuit is turning on and off. How can I prevent
...
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Why are orange diode lasers still not common although orange LEDs have been around for decades?
Nowadays you can find lots of cheap laser diodes emitting light at wavelengths such as 405, 450, ~640, ≥780 and, since recently, also ~520 nm. But it's really hard to find a laser diode emitting at ...
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DIY laser cutter - laser is turning off at various places while cutting [closed]
I converted my Monoprice Maker Select IIIp 3d-printer into a laser cutter by mounting a 4W diode laser to the printhead, and using the cooling fan leads to control the laser beam, via a simple ...
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