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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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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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28 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
64 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
125 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
56 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
57 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
53 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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29 views

Drive a VCSEL with PWM

I want to use a VCSEL for illumination purposes in experiments (I've already have an LED illumination board and want to test the same thing with VCSEL). I've searched a lot and only found VCSEL/Laser ...
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2answers
93 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
22 views

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
160 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
131 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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47 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
58 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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0answers
54 views

How do I tell if my Lidar sensor will detect an object of a certain size?

I'm considering buying a Benewake Lidar sensor for the purpose of detecting a 1 inch diameter tube that's 12 feet long from ~3 meters away. The tube will be laid perpendicular to the sensor's beam. ...
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2answers
202 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
55 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
47 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
323 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
9k 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
44 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
113 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
128 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
453 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
50 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
99 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
66 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
343 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
252 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
166 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
262 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
98 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
173 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
491 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
269 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
299 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 ...
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1answer
132 views

Importance of laser numerical aperture in selecting photo diode

I want to design a circuit in which the laser light will be detected by a photodiode. I just wanted to know how the laser numerical aperture will affect the photodiode selection. Am I have to ...
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1answer
51 views

Is thermoelectric cooler needed to produce constant laser output?

I'm making a laser diode module using a LD, a PD, and a LD driver board. With the components I would be able to monitor the optical output from the LD and then adjust current to keep the output ...
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0answers
92 views

High presicion current source for a laser diode

Previously, I asked how to make a simple current source for a laser diode Microcontroller controlled pulse current source but in reality the circuit I took from this topic how do i create a current ...
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1answer
136 views

How to detect obstacles (Tripwire with Laser, IR or similar)

Supposing I have a glass sheet 50cm x 30cm, with 10 holes (2 lines x 5 columns), with metal/plastic (i can chose) pins inside it. They can be flush (hidden in the hole) or salient (extending 2mm above,...
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1answer
70 views

Vehicle tracking and direction processing

Im trying to find a good way for tracking vehicles. Its like counting all the vehicles (cars, motor cycle or any vehicles)through a point on the road. Also it needs to count like how many in total and ...
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0answers
45 views

LiDAR range finder spec clarification

I have a data sheet for a laser range finder based on TOF. I am however confused. The "Measure Time" is 0.6 seconds, but the "Measuring Frequency" is 0.1Hz - 10Hz. Similarly, other range finder data ...
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1answer
3k views

Why order a laser stencil?

Quick two part question on PCB manufacturing. I am looking to order a prototype PCB and all the manufactures I've gotten a quote from all offer to include a Laser stencil, some charge for the stencil ...
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2answers
210 views

Hack fibre optic transceiver for wireless data link

I'm brainstorming ways to implement a high speed wireless laser data link without the exorbitant cost. Would it be possible to take a standard SFP transceiver module and use that across free space ...
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1answer
300 views

Best way to wire multiple laser modules

I have purchased 16 Red 3-5V 650nm 5mW laser modules which I believe have a driver included. I also have a 100000mAh Li-Polymer battery with 2 USB outputs, one at 5v 1A and one at 5v 2A. If I wire ...
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0answers
69 views

Trying to externally power and control laser from a stage light using an Arduino

I am trying to control a laser stage light using an Arduino. The laser stage light has two different lasers. I am trying to control the red laser. The red laser has an input and ground port. I have ...
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2answers
160 views

Can someone please explain how this circuit works

It's s simple transmitter for light modulating certain sound we input to it. But i can't seem to know how this modulates the input signal.
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2answers
896 views

Driving a laser diode with an LM317

I want to make a a line of sight sensor. I want to drive a laser diode with constant current and aim it at a photodiode, then using a transimpedence amplifier I will monitor any changes in light ...