Questions tagged [laser-diode]

A type of diode that produces laser light.

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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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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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Laser diode control without PD

I'm currently looking for a new light source for a system. The laser diode seems to be an excellent candidate. However, for the specific wavelength I need (488 nm), diodes with an integrated ...
msch's user avatar
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Laser communication system to transmit Audio

The audio in these two circuits is only transmitted when they are both connected to the same battery (Vcc), and only the laser control audio level not the transmitting process. When I connect the ...
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KY-008 laser diode module: how is the 5mW power rating explained

I am puzzled by this "5mW"" rating and wonder if someone can explain it. Current rating is 30mA under 5V so the total input power is 150mW. With a voltage drop across the diode of 2.2V ...
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Laser driver diode design for fast switching times which can be controlled via computer

I am trying to create a laser driver circuit that can allow me to drive a laser with relatively low operating current and voltage with fast switching times and can be controlled via a pulse blaster (...
Moiz khokhar's user avatar
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2 answers
229 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
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1 answer
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Adapter sockets for different TO can pin circle diameters

I need to mount a laser diode from Ushio with 2.0 mm pin circle diameter, onto a combined strain relief/ESD protection cable from Thorlabs, which has a socket with 2.54 mm pin circle diameter, Are ...
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Confusion in understanding bias circuitry of a laser diode

For the following high speed laser diode pinout: Another example is: Is my model below correct?: My first question is what type of bias-Tee is that L and R form and what is the purpose of them? ...
ty_1917's user avatar
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2W laser diode driver

I'm trying to use a Thorlabs L1450G1 IR Laser diode. I built a circuit that a friend made (I think it is for another model.) It does not work. Supposedly this circuit controls and varies the current ...
Jairo Christopher Peralta Ayal's user avatar
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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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Adding PWM function to a XL Semi XL4015 5 A 180 kHz 36 V buck DC to DC converter to create a NUBM44 laser driver board

I am asking this question just to make sure I haven't missed anything important because I am at best a novice when it comes to electrical engineering. What I am trying to do is build a laser driver ...
Cameron A's user avatar
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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 ...
Hoverboard2525's user avatar
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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 ...
cats are the best's user avatar
4 votes
6 answers
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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 ...
leon bouman's user avatar
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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 ...
Pierre-Laurent Chambert's user avatar
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1 answer
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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 ...
cm64's user avatar
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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 ...
Geoffrey Falk's user avatar
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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 ...
leon bouman's user avatar
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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 ...
cm64's user avatar
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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 ...
A . K.'s user avatar
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1 answer
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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 ...
Julio Otuyama's user avatar
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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 ...
Andrew Reardon's user avatar
2 votes
1 answer
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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,...
Tanamas's user avatar
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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 ...
Ravi Pradip's user avatar
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2 answers
136 views

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 ...
anrieff's user avatar
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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 ...
DKNguyen's user avatar
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6 votes
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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 ...
Julio Otuyama's user avatar
3 votes
2 answers
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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 ...
RandomGuy's user avatar
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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 ...
Elementronics's user avatar
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88 views

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 ...
John Am's user avatar
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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: ...
Kwok's user avatar
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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 ...
The Pointer's user avatar
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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 ...
Helen's user avatar
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4 votes
2 answers
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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 ...
The Pointer's user avatar
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1 answer
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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 ...
The Pointer's user avatar
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1 vote
1 answer
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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 ...
Michael's user avatar
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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 ...
Megidd's user avatar
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1 answer
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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 ...
Kwok's user avatar
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1 vote
3 answers
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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 "...
strange_bakery's user avatar
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1 answer
107 views

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. ...
Marakoss's user avatar
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2 votes
1 answer
232 views

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,...
Kwok's user avatar
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1 answer
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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 ...
quetzalcoatl's user avatar
3 votes
1 answer
316 views

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 ...
leon bouman's user avatar
3 votes
5 answers
2k views

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 ...
isync's user avatar
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0 answers
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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 ...
fpgaking's user avatar
2 votes
0 answers
144 views

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 ...
hennep's user avatar
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1 vote
1 answer
164 views

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 ...
EmbeddedGuy's user avatar
0 votes
2 answers
763 views

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 ...
SUNITA GUPTA's user avatar