Questions tagged [laser-diode]

A type of diode that produces laser light.

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49 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 ...
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20 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 ...
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1answer
38 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 ...
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3answers
91 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 "...
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1answer
81 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. ...
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1answer
49 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,...
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1answer
47 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 ...
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1answer
287 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 ...
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4answers
364 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 ...
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0answers
94 views

5.5W 450nm China laser diode driver problem

I have a Chinese 5.5W diode laser which I gave 5V on the 12V pin. The power LED was blinking but I didn't care because I didn't know what that means. After some time, the LED stopped blinking and the ...
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0answers
27 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 ...
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0answers
72 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 ...
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18 views

Automotive Lidar optical testing

What is meant by Lidar optical testing? The optical section of Lidar contains 1)Laser diode 2)Tx/Rx optics 3)Photodiode Whether it meant testing the above sections? If so,What parameters are tested in ...
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1answer
49 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 ...
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2answers
92 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 ...
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2answers
86 views

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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165 views

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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1answer
61 views

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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2answers
122 views

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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1answer
94 views

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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0answers
59 views

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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2answers
2k views

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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96 views

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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1answer
70 views

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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1answer
128 views

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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1answer
343 views

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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1answer
125 views

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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2answers
302 views

Reducing 3v supply to run 2.4v laser diode

I am setting up a laser trip wire system, this question revolves solely around the laser itself. IMPORTANT: The laser is always on (it will have an on/off switch) Supply voltage is 3v (2x aa's) ...
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1answer
60 views

Current coupling in self-monitoring laser diodes

I always wondered why the most common pinout for laser diodes with a monitoring photodiode was so strange. It wasn't sure how it was intended to be used until I ran into this circuit here: https://...
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1answer
163 views

Laser audio transmitter - need substitutes

I'm building a laser audio transmitter that uses amplitude modulation to transmit audio via a 5mW laser beam. The transmitter uses a microphone, an operational amplifier (to modulate the signal if I'...
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1answer
115 views

Is there a difference between rise and fall time and modulation frequency

I was wondering if there was a difference between modulation frequency and rise and fall times of a laser diode or LED? If a laser had a modulation frequency of 100MHz would that be the same as a rise ...
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1answer
86 views

What are laser diode drivers used for

When do you need a laser diode driver to power and pulse a laser diode? Is it related to the power it needs or the speed of the pulse? I am looking to use multiple laser diodes which have an output ...
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1answer
525 views

Driving a butterfly package DFB laser

I want to drive a DFB laser in a type-2, 14-pin butterfly package. The manufacturer has provided limited information on how to bias the laser diode and could not get any information on the reference ...
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1answer
201 views

How to understand this simple voice-over-laser circuit

The Sci-Toys project A simple laser communicator shows a surprisingly simple way to send an audio signal over a laser pointer. A transformer AC-couples an audio signal directly into the DC supply to ...
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0answers
220 views

Amplitude Modulating a simple Laser using an RF transformer

I know I can modulate a laser using an audio transformer see pic and website below. Pen Laser website I was wondering if it’s possible to modulate a simple pen laser using RF signals in the RF range ...
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2answers
218 views

Laser Diode Feeding

Edit: Laser diode info page I have a basic question about laser diodes. For a 14-pin butterfly package as shown below. I know that I need to control the current going in to the laser diode, but I don'...
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3answers
921 views

Why is a lab PSU not suitable for driving a laser diode directly?

I'm looking to drive some laser diodes (50mW) at very modest powers (50%), using simple circuits no doubt less sophisticated than most lab PSUs. Why does this site say it's not an option? I ...
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1answer
329 views

Laser pointer circuit

I've got a small red laser pointer from a chinese ultrasonic distance meter, which has a small regulator circuit (6mm x 7mm) with SMD components. I guess that is a constant current to drive the laser,...
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1answer
51 views

Bandwidth (Data rate) of a laser beam when no datasheet exists for the module

I ordered a large number of laser modules that look like the following: When inspecting mine with a basic multimeter, I noticed a 90 ohm smd resistor is fitted on the module. I see no other ...
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1answer
98 views

Can sending correct data via UART qualify as valid manchester encoding?

I'm currently in the process of having a laser beam detected by the phototransistor. While the parts in themselves work, I want to detect when the beam has been detected. I understand that a 38Khz ...
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1answer
85 views

Laser Diode Coherent OBIS

I was trying to change the laser diode in one of our broken OBIS Lasers (640nm, 40mW). Thus I thought I would buy this Thorlabs HL6362MG diode. If I connect the diode to a power supply directly at 2....
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3answers
2k views

How to transmit data with a laser beam? [closed]

I am working on a project about data transmission with lasers. The project is very young so I can modify my current planned setup if necessary. This is the actual planned setup: Every raspberryPi ...
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2answers
409 views

Laser driver configuration with 5MHz modulation and current monitoring

I have a huge task in front of me and I am actually lost. I want to drive this laser diode. I've worked with laser dirvers before and I used LM317 for simple circuits. This time I'd like to safely ...
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1answer
319 views

Laser for Engraving & Cutting [closed]

Can I use 500mw 808nm Infrared IR Laser Diode for engraving and cutting of wood, plastic and metal?ASER https://www.banggood.com/Focusable-500mw-808nm-Infrared-IR-Laser-Diode-Dot-Module-12V-TTL-Fan-...
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0answers
191 views

Max current for 5ns pulsed CW laser diode?

I'm looking to reduce the cost of a lidar system by replacing the DPSS laser with a blue pulsed laser diode (this is for an underwater project) Is there a rule of thumb for the appropriate current to ...
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4answers
4k views

What makes a LED a laser diode?

High-level survey of this question is fine: After reading https://en.wikipedia.org/wiki/Laser_diode I still can't tell if the electronics that enable a diode to lase are different from those that ...
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1answer
2k views

Optical audio transmitter can't handle speech

This is a question relating to my project on an optical audio transmitter. I wired up a very simple device in which I use an audio signal transformer (EI14) to modulate the intensity of a laser beam (...
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1answer
863 views

What is current modulated laser driver? What does it do to the laser?

The title is actually one of the many questions I have. I've started to work on a project that includes lasers. I've worked with lasers and fiber optics before and I even constructed a simple constant ...
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3answers
181 views

Improving the quality of an optical audio transmitter

I wired up a very simple device in which I use an audio signal transformer (EI14) to modulate the intensity of a laser beam (a cheap 650nm, 5mW diode) according to the audio output of my phone. The ...
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2answers
2k views

Simple constant current regulator for a 1.6A laser LED

My intent is to build a simple driver for a laser LED with an operating voltage of 4.6 volts and forward current 1.6 amps. I have some spare LM317s that I would like to use, however they can supply 1....