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Questions tagged [laser-diode]

A type of diode that produces laser light.

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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
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How to optimize wavelength of a photodiode exclusively to single wavelength?

I have a laser diode with parameters: a. Laser Wavelength: 785 nm b. Laser Power: (0 – 100) uW c. Laser Modulation: 1 KHz I need to design a photodiode circuit based on these parameters. I plan on ...
solitude_surfer's user avatar
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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
1 vote
1 answer
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Understanding this constant power laser driver circuit

I am trying to reverse engineer a constant power laser driver. Unlike constant current drivers, these use an integrated photodiode which monitors the laser diode output. The photodiode current feeds ...
selene flemming's user avatar
-1 votes
1 answer
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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 ...
drew wood's user avatar
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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 ...
Kinka-Byo's user avatar
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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 ...
Alaa's user avatar
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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 ...
philippe thibault's user avatar
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3 answers
191 views

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
2 votes
2 answers
255 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
1 vote
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 ...
srhslvmn's user avatar
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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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3 answers
174 views

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
2 votes
0 answers
175 views

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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2 answers
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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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3 answers
353 views

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
945 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
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0 answers
64 views

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
1 vote
1 answer
44 views

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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2 answers
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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
1 vote
0 answers
188 views

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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1 answer
500 views

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 vote
1 answer
272 views

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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0 answers
48 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
2 votes
1 answer
129 views

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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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
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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
-1 votes
2 answers
151 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
4 answers
2k views

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
1k views

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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0 answers
115 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
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0 answers
106 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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1 vote
1 answer
321 views

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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0 answers
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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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0 votes
0 answers
60 views

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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5 votes
2 answers
1k views

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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0 votes
1 answer
106 views

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
  • 1,281
1 vote
1 answer
391 views

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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1 answer
161 views

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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0 votes
1 answer
80 views

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
  • 113
1 vote
3 answers
1k views

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
0 votes
1 answer
111 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
  • 107
2 votes
1 answer
250 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
  • 113
1 vote
1 answer
105 views

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
317 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
3k 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
  • 277
1 vote
0 answers
50 views

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