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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3answers
45 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
53 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
60 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
61 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
60 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
76 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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87 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
51 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
192 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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0answers
42 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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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
38 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
24 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
46 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
114 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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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
88 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
149 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
67 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
84 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
57 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
128 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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0answers
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Lowest resistor value for enclosed light sensor unit with nearby lighting without losing sensitivity

This is a drawing I made of a light sensor unit I'm creating. Inside of it, I have a circuit board containing 3 7-segment displays and I have two photo-transistors (yellow half-circles in the picture) ...
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1answer
312 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
198 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
74 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
376 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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0answers
67 views

How can I use the MQW statement in Silvaco Atlas

I want to use MQW statement in Atlas by Silvaco for a quantum well in my structure. I define the barrier in the region, but I do not know what to do with the values x.min x.max y.min y.max. How does ...
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1answer
56 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
367 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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7answers
10k views

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
47 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
168 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
132 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
803 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 ...
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0answers
74 views

Help with Laser MPE calculation

I am building a laser room and I'm basically trying to calculate the maximum time of laser radiation to they eye before causing any harm. I found that to be 7 seconds but I would very much appreciate ...
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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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3answers
121 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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1answer
92 views

Thermostat for induction heater with small coil

I bought a ZVS 1000w induction heater I would like to control it with a thermostat in order to control the temperature of my steel piece. I hold the piece with a clamp and I don't want to put a ...
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1answer
486 views

Is an exhausted PSU safe to use for an FPGA? [closed]

For a project I will have 4 stepper motors,a laser module and few modules attached to the FPGA. I need around 10 amps. Clearly the FPGA can't provide enough power for all the modules. I think to use ...
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2answers
306 views

Transimpedance amplifier with inverted output

In a little hobby project I am trying to send data from one Arduino to another using a modulated laser and a photodiode. On the sender side, the laser has a dedicated modulation input for up to ...
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1answer
263 views

Improve switching speed for a <50mW laser with an Arduino and Transistor

I'm trying to build a "laser harp" device similar to this: (http://www.instructables.com/id/Frameless-Laser-Harp/), but I'm having trouble switching my laser on and off fast enough, and for full ...
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2answers
433 views

What are the advantages of pulsed laser

I'm talking about laser diode for engraving/cutting cnc. As far as I know led or laser diodes are often driven by pulse signals to enhance their performances. Please note I'm not talking about the ...
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2answers
131 views

What do we mean by bidirectional TEC?

I have designed a H-Bridge driving circuit for TEC where the polarity across the TEC (load) changes according to heating and cooling application. But when I am searching for TEC Module they have ...
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1answer
246 views

First step in pulsing a pulsed laser diode

here is the datasheet for the laser im looking at https://dammedia.osram.info/media/resource/hires/osram-dam-2496525/SPL%20LL90_3.pdf All i want to know is where i even start, i see the input voltage ...
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0answers
624 views

How does a pulsed laser diode driver circuit work

So i am looking at pulsed laser diodes, and i want to build a circuit for it to work. https://www.osram-os.com/Graphics/XPic7/00054198_0.pdf/Standard%20Pulsed%20Laser%20Diode.pdf This is the article ...
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1answer
360 views

How to calculate a laser diodes amps from its wavelength?

I am building a laser driver circuit. Every laser diode requires a different amount amps to run correctly without burning. So instead of me coming on here and asking what each laser diodes amps are, ...
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1answer
411 views

Influence of active area of photo diode on sensitivity

I am using a photodiode for detecting the laser. I have a question regarding the active area of the photodiode. Is less active area photodiode is less sensitive? Or it totally depends on the laser ...