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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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Do I need a laser diode driver for this? (noobegginner)

I have a blue laser diode, with max specs of: 2.4w 2.2A 5.2V Currently, im using a ion power bank with a skinned usb wire to power it. The maximum current I measured from it is only 1.4A, and voltage ...
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Driving laser modules with MCP23017 and MOSFETs

I would like to make a PCB to switch 16 laser modules on and off. The laser module in question is this one: https://www.sparkfun.com/products/9906 I believe the module already has a driver included (...
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120 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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How optical sources having narrower spectral width gives higher data rates?

How optical sources having narrower spectral width '\$ \Delta \lambda \downarrow \$' gives higher data rates '\$ R_B \uparrow \$'? For example: Laser having lower spectral width gives higher data ...
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Laser Driver for 405 nm laser diode

I'm new to this site and this is my first post here. So my plan was to try building a laser or better a driver for my laser diode but as it seems I don't have enough of the technical understanding of ...
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Laser Heads/Diodes vs 300v Pulse?

So I've been experimenting with lasers and whatnot. I'm wondering if I took a disposable camera charging circuit and used the stepped up voltage to quickly pulse into the laser, what mW laser would be ...
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110 views

Measure fluid height in bottles

We need to measure the height of different fluids (from clear water to oil, everything is possible). The bottles may come in different sizes and may have an opening as small as 10mm. The bottle ...
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113 views

what kind of laser is this?

This is a 40mW laser. It's about 2 inches long. What kind of laser is it (diode, etc?)
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53 views

Laser diode feeding DIY driver

I am interested in feeding a laser diode (LD) with 2.5V and 210 mA. I am using basically a Darlington configuration as shown in the schematics. In order to prevent any damage to the LD I am using a ...
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25 views

How to measure the amount of light emitted back from a fiber optic cable?

I would like to build a setup where I use a light source to emit a signal over a fiber optic cable, and then measure the amount of light that is emitted back, e.g. by blocking/opening the other end of ...
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81 views

Laser diode help? [closed]

I recently took apart an old DVD player, for the laser diodes, but instead I found some strange looking components with many pins. Please help me find out what they’re are and the pinouts🙏🏻
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Is there a way for a laser to work across a range of colors?

For lasers used for free space / mirror steered / diffuse beam communications or LIDAR scanning, would there be some way for a single laser to be able to selectively transmit across a range of colors, ...
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38 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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30 views

Solid State relay and Limit switch

I'm building my first CNC machine, it's a 40W Laser Cutter. I'm planning on adding a security feature that cuts the laser power supply if the enclosure door is open during while operating. I want to ...
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1answer
56 views

How to measure laser class of LIDAR

I just bought a LIDAR with the intention of building an indoors robot that uses it to navigate rooms in my apartment. The manufacturer website states: Low power infrared transmitter conforms to ...
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3answers
52 views

What is a near IR blackout material for Lidar testing?

This question seems not a best best question for this place but still related. I am doing a project regarding to lidar that involves in testing lidar behaviour when beams get absorbed. So, what is a ...
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1answer
77 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
66 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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2answers
81 views

transient protection for 0.5W laser diode switching driver

I'm some way into a project which involves switching 0.5W laser diodes at 100kHz, with a pulse of around 1us in width. I'm having issues with the diodes (which I don't have a datasheet for) failing ...
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2answers
102 views

Arduino Laser Engraver cd drive - what do i connect where?

I am a beginner in the world of circuit boards and electronics, and this is my first real project. I am making a DIY laser engraver, following the instructions in this instructable. Here is the ...
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1answer
82 views

Using laser engraving for date stamping [closed]

This is my very first big project. I have to build a laser engraving machine for date stamping. I'm using Arduino Uno microcontroller and a CNC shield with GRBL control. Being fairly new to G-code, I ...
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91 views

A peculiar issue in an atomic force microscope [closed]

I'm not sure where else to turn for this issue. Hopefully you all can offer some insight. Sorry the title is so vague, I don't know how to explain this concisely. I am a teaching assistant for an ...
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1answer
56 views

Energy delivered by a LED in Joule

Please help me with calculation I read in the link https://www.thorlaser.com/LLLT/calculating-LLLT-dosage.htm A 500mW laser with a beam area of 0.25Cm2 used for 20 seconds delivers 40 J/cm² A 200mW ...
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1answer
346 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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45 views

Powering multiple Laser Diodes

Hi I am working on a project that has 6 laser diodes. each pair has different voltage requirements. They are 7V-10V, 3V-5V, and 3V-5V. any suggestions to how I could power each together with one board?...
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69 views

Laser Tag System Design Review

I have been working on a project to make my own laser tag gins and sensor vests. I have completed the electrical side of my design but this is the first time I have designed something like this and ...
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1answer
63 views

tec laser diode cooling

I would like to cool a laser diode, which has maximum thermal power of 1 W (actually according to datasheet should not be higher than 830 mW). The operating temperature range is (25-30) Celsius. I ...
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1answer
26 views

Multimode to singlemode optic fiber

I'm naive in this field, but I will need to use optic fibers for optogenetics application. I already know that my question will sound stupid for the most of you, please forgive me for that. My ...
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2answers
70 views

Powering an IR + RED laser with an Arduino

I am hoping to run a laser diode from an Arduino. The specific one with included data sheets are here: https://industrial.panasonic.com/kr/products/semiconductors/laser/red_infrared/red-and-infrared-...
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1answer
250 views

What are my options for supplying power to an M140 M-Type JAPAN 2+ W laser diode running off of a 5A constant current laser driver? [duplicate]

Background: I am building a laser that is running off of an M140 M-Type 2+ W 445 nm laser diode and an adjustable constant current driver. Here are the specifications for both the driver and the ...
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39 views

Modulation index and sidebands

I have built a Mach Zehnder interferometer in which a laser beam is first split. After each splitted beam is passed through a AOM driven at a fixed RF in my case 40 MHz and 40.04 MHz they are ...
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2answers
95 views

Is there such thing as a Laser beam detector that returns a non binary result?

As the title implies , i'm looking for a device that can detect at what point a laser beam has been broken. So idea would be the device to output a certain voltage depending on where someone's finger ...
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1answer
186 views

Laser Microphone setup

I am currently constructing a laser microphone using 5mW red laser pointer source based on the idea below, not directly output to a speakers or headphones, but the signals must be fed into computer ...
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1answer
81 views

Can I power a laser directly from a computer PSU?

I have purchased this laser with a driver from Ali. I connected the laser to the driver and the driver to a 12V DC and the TTL to 5V (which I then disconnected since the applying 5V to TTL actually ...
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2answers
113 views

Measure laser with photoresistor (LDR)?

I want to make a simple setum, where I can measure the opacity of air. I want to use a simple laserbeam, which I shoot across the room, and on the other side I want to measure how much is blocked/...
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1answer
61 views

Can I use these normal IR Photo-Diodes for long range laser communications?

This is my first time working with lasers, I made a data transmission system with a laser using normal components, and now I would like to change It to a very long range system (~2-3 KM). My question ...
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2answers
165 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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1answer
452 views

what is the difference between using mosfet and bjt for op amp based current source

I have planned to design a op amp based current source driver for laser,but i came across two design one used mosfet1 at the output of op amp and other used bjt2 what is the difference What is the ...
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4answers
336 views

How firmware [like BIOS] gets added to hardware

I am reading about BIOS, which is a piece of non-volatile Firmware. Wikipedia says of firmware: Common reasons for updating firmware include fixing bugs or adding features to the device. This may ...
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1answer
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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
122 views

Simple DIY laser alarm

Im begginer and currently Im trying to make DIY laser alarm (while laser is pointing at LDR sirene should remain silent and when laser is turned off, sirene should make sound). I found online ...
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3answers
465 views

Why does Lidar have GPS, serial, and PPS input?

Many commercial Lidar systems have GPS, PPS, and serial interfaces. What's the application and how's it being used?
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1answer
62 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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4answers
391 views

Can radar/lidar sensors for self-driving cars be designed to ignore deliberate interference?

A previous question asked about how to avoid interference between sensors on different self driving cars. The answer was that systems could be designed to avoid interference, with correct signal ...
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6answers
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Will radar/lidar still work when every car is equipped with them?

Self driving cars rely on cameras, radar, and lidar to recognize the environment around them. Cameras of course don't interfere with each other, since they are passive sensors. Since a signal ...
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1answer
48 views

How are phosphorescent displays used as monitors?

I've recently been looking into old displays such as the ones on the tektronix 4010. These displays "draw" on a phosphorescent screen in a way that is really fascinating, and I want to recreate it. My ...
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1answer
261 views

Photodiode circuit Op Amp and amplification failure

I am trying to build a photodetector circuit to detect and amplify the output signal of a fiber laser. I started with testing my fiber pigtailed photodiode on a breadboard as shown. simulate this ...
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1answer
146 views

Is it safe to watch a video/picture of class 4 laser? [closed]

Was wondering because I heard they were very dangerous even if not looked at directly. Wonder if looking at a picture or video can harm eyes may sound like a will question but it's always good to be ...
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3answers
1k 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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1answer
37 views

Maximum voltage in series circuit

I have a set of laser-modules with integrated drivers that I want to setup in series. The datasheet says the maximum voltage for a module is 3.3V. Two run two modules in series I doubled the voltage ...