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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45 views

What kind of sensors would be best for a fish finder? [closed]

I'm making a fish finder and underwater terrain sensor device. I've heard that ultrasonic sensors do not work very well underwater so at the moment I am hesitant at employing one. I'm also considering ...
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2answers
57 views

Why did cars switch from infrared key fobs to radio-wave key fobs? [closed]

Is an RFID key fob less likely to have its signal blocked? Or is it longer range? Or can it be made smaller, or cheaper? Also, how do infrared devices generate an infrared signal? With an infrared-...
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1answer
52 views

My NE555 circuit triggers falsely when connected to the mains using a 5V adapter

I have designed a laser security system using an NE555 in monostable mode with a potentiometer to adjust the pulse length. Another NE555 (U2) ciruit is used for delaying power on the monostable ...
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1answer
72 views

Arduino ultrasonic sensors in closed spaces

I am wondering whether or not it is possible to use an Arduino ultrasonic sensor in a closed box (30 cm x 30 cm.) I have been told that the walls will cause the signal to bounce all over the place and ...
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35 views

Laser-Doppler Velocimetry. Math/measurment problem

My team of 3 were tasked to measure the speed of a disc with a small hole on it using laser-doppler velocimetry (measurement and sensor technology class). After doing the measurments and writing them ...
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1answer
97 views

85W laser array driver circuit

I have an OSRAM 85W 450nnm laser array. It's essentially a large 'chip' with 24 integrated laser diodes (break it down they're approx 3.5W diodes each.) The Chinese source I purchased it from also ...
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1answer
278 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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1answer
66 views

Photon lifetime in an optical cavity

Hi I have the following problem and data for an optical cavity. Length \$ L=100 \mu m\$ Reflectivity \$R=0.33\$ Refraction index \$n=3.6\$ Inner losses \$p_i=20 cm^{-1}\$ Now I have to determine the ...
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1answer
40 views

A question about electronic measurement of pulsed laser

I have read recently somewhere which I cannot find now, that extreme short pulse width lasers cannot be generated electronically. But if electronic circuitry is not capable to to generate such laser ...
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55 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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2answers
51 views

Is there a way to measure distance to a surface of a liquid (water for example) using the V6180 time of flight sensor?

I'm using the Vl6180 time of flight sensor to measure a distance to a surface. This surface is a liquid, water for example. In my setup, the sensor doesn't detect the surface, the pulses from the ...
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Powering 5V Laser with Raspberry Pi 4 GPIO Pins

I am powering a 5V, 5mW laser that draws ~30mA (KY-008) with a GPIO on my Raspberry Pi 4. From my research, GPIO pins have a voltage output of 3.3V, so I'm not supposed to be doing this. Unfortunately,...
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1answer
38 views

Better displacement finder? Lasers/Inertial Sensors

I've seen laser rpm measurement devices. But can it be used the find displacement/distance moved for object when attached to it? I know taking rpm of wheel and multiplying by circumference would give ...
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2answers
79 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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3answers
112 views

A laser driver (MLD203P1) with an external Bias-Tee for modulation

As the title says, I would like to add an external Bias tee to modulate a high frequency signal into a laser diode, because the laser driver I have chosen does not have a built-in modulation circuit. ...
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1answer
70 views

can you turn a visible laser pointer into a uv one?

I was wondering if there is anything I can do to make a visible laser pointer uv with (or without) messing with the laser. like if I simply shot the laser pointer through some device or screen that ...
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1answer
44 views

Saftey regulations of multiple 1mW lasers

AFAIK devices containing exposed 5mW lasers are illegal without a license, but those containing 1mW lasers are. But how about a device with ten 1mW lasers? Is it still a safe and legal device? The ...
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1answer
34 views

Need help understanding E/p V/cm.torr

I am a hobbyist, and lately I've been reading up on N2 TEA lasers. Here is the article I've been reading so far: The TEA Nitrogen Gas Laser In the introduction, the author uses the E/p ratio. Which, ...
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2answers
147 views

LASER diode driver circuit

I have some problems on understanding how this circuit works. Its aim is that of: bias correctly the LASER diode at left send a signal (DATA) to the LASER diode stabilize the working point of the ...
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2answers
951 views

How a laser ranger finder actually works on an odd surface

I am trying to learn something about LIDAR sensors or Laser Range finders. But I am always getting confused how could it get works. What I understood about the principle is it emits a laser (...
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1answer
92 views

laser --> charge capacitor?

I'm not an EE, but I do have a question that I hope isn't totally trivial. Please tell me if I have the calcs below correct: Current research on the surface photoelectric effect shows that if one ...
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1answer
77 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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1answer
52 views

UL certification and laser tag equipment

We are a 32+-year-old laser tag equipment company. We purchase parts overseas and assemble them in the US and have hundreds of installations all over the world. We have been told by 1 location that ...
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1answer
69 views

Laser and galvo project

I'm working on passion project that would allow me to control laser and mirror galvanometer (galvo in further text) using Arduino board. Laser and galvo that I've bought are encased in plastic ...
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2answers
94 views

High Frequency Laser Modulation

I am looking at doing some phase-shift lidar experimentation. To get good accuracy, all the papers suggest that I need to be modulating the laser diode sinusoidally at ~200MHZ. I am finding ...
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3answers
156 views

Ultra-narrow beam spread LASER diode

I want to build an optical position tracking system based on PSDs (Position-sensitive detectors). I searched online and found this PSD which has a sensitive area of 12 mm*12 mm. My goal is to allow a ...
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1answer
58 views

Detector for a fiber optic gyroscope

I'm a navigation engineer, so I often have to deal with gyroscopes and their measurements. Out of curiosity, I've decided to build one myself and will give it a try with a Fiber Optics Gyroscope (FOG),...
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1answer
64 views

Task of the Driver on Mach Zehnder Modulator [closed]

What is the task of the Driver of the MZM modulator? I'm trying to get RF input for the MZM, does the driver convert optical input to RF? We have a driver, what's the purpose of it? How can I design ...
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2answers
68 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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66 views

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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134 views

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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1answer
279 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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2answers
69 views

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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1answer
117 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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39 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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1answer
216 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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2answers
110 views

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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1answer
55 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
41 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
59 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
74 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
152 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
80 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
233 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
142 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
96 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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95 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
68 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
508 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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89 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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