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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Reverse engineering port on laser for rotary attachment

I have a Trotec Speedy 300. It has the ability to control a rotary attachment by plugging it into a 12 pin Molex port inside the printer. The attachment costs over $1500 plus shipping from the company ...
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DVD burner laser identification

I just disassembled the DVD writer from a laptop and scavenged some parts. Around where the laser and mirrors and opto stuff are packed together, I extracted these parts. Which one is the laser diode ...
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Photodiode Current Calculation for Simulation

I am designing a transimpedance amplifier and was trying to simulate the circuit to study its characteristics. I came across this online design tool provided by Analog Devices that builds the ...
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How to control the repetition rate/mode spacing of a mode-locked laser?

The YouTube video Fundamentals of Frequency Combs says that the repetition rate (mode spacing) of mode-locked lasers can be controlled by CW lasers or microwaves. It says you can take the output of ...
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1 answer
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Identify Component with Markings

I can't identify this component.
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1 answer
248 views

What are the ways in which semiconductor-grade neon is critical for manufacturing?

This is a question about material use specifically in semiconductor manufacturing. CNN's Ukraine halts half of world's neon output for chips, clouding outlook begins: Ukraine's two leading suppliers ...
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High frequency photodiode laser receiver strange output

We've built this transimpedance amplifier circuit to receive 10kHz pulses from a laser. The laser is driven by a square wave signal generator and is pulsing correctly. We expected to see a square wave ...
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Driving multiple serially connected laser diodes with GHz arbitrary waveforms

For the purpose of a scientific experiment, I need to illuminate a sample with multiple laser diodes (LD) arranged in a 1D array. I need at least 10 arbitrarily driven LDs but I have AWG with only 2 ...
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How to track, measure, manipulate and/or synchronize the phases of trapped ion qubits [closed]

I am working on a simulation of the Honeywell trapped ion quantum computer. The papers say that it tracks the phases of the qubits using "opto-electronics" but it doesn't give any detail.
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How to score glass to shine straight horizontal laser line through [closed]

I’m trying to make a DIY laser level, I took apart a cheap one to see how to shape a laser spot into straight lines, it turns out that a simple laser beam passes through a small piece of glass (or ...
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2 votes
1 answer
139 views

Connecting laser diode to a driver

I'm attempting to connect an infrared laser diode to a laser diode driver circuit. I'm inexperienced with electronics and am having difficulty interpreting the technical information of my parts. The ...
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Modulator in lasercom: from theory to practice

Hello everyone! We are working on a realisation of an optical modulator and have a doubt. Mr Noel Miller posted already a question, but it was suggested this community. I will repost his question ...
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What are the ramifications of the existence of this "modulation rate" for the use of these lasers for interferometry?

I'm looking for a specific type of laser for interferometry experiments. There seem to be a lot of 1550nm fiber-coupled DFB laser diodes on websites like Alibaba. This seems to be because they are ...
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7 votes
2 answers
556 views

Constant current source design considerations

I am designing a constant current source to drive a laser diode. I need it to be adjustable (from 0 to 100mA max) and stable enough as I will be using it as a light source in a Foucault mirror tester ...
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Why is it that the maximum fringe contrast is observed when the signal mean is half the amplitude?

I am currently reading the Fringe Contrast section of this document. This section says the following: Why is it that the maximum fringe contrast is observed when the signal mean is half the amplitude?...
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Are there any laser sensors that have a high accuracy at 200-400 mm with low laser angle? [closed]

I'm looking for a simple laser sensor that has these properies. Range and accuracy at different reflectance I recently wrote an unscented Kalman filter in C code and tested it with a VL6180x laser ...
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What does the term "boresight", and what do the phrases "boresight adjustment" or "boresight calibration", mean in the context of laser scanning?

I have been studying the laser scanning literature. In doing so, I often come across the term "boresight", and the phrases "boresight adjustment" or "boresight calibration&...
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Setup for fringe contrast measurement

I am currently reading the Fringe Contrast section of this document. This section says the following: Be sure to use a DC-coupled detector when measuring fringe contrast. Adjust the interferometer ...
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Lazer wifi connection [closed]

Would it be possible to create a Wifi cable that uses lasers to send information at light speed?
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1 answer
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Laser Power Control Using Duty Cycle

I have a Coherent Cx-10 CO2 laser that I want to use for laser heating of very small samples at high pressure, so I need to accurately control the laser power. I also have a pulse width modulated ...
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1 answer
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Low Current (<500mA) Transient Current Suppression Methodologies

I am looking into possible methods of protecting against small current transients for use with a laser module and am having trouble finding information, partly because I am unsure what exactly to be ...
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2 votes
3 answers
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Low spread high power laser

I am looking for a laser which can travel about 10 km through air from one end of a lake to another. It needs to have a minimal spread, i.e. a small diameter spread over the 10 km - less than 10 cm ...
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-1 votes
1 answer
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Build plans for a PSU 13.56 MHz 300 W - 1000 W with adjustable voltage between 200 V - 500 V

This is a kind of continuation of a previous thread Howto: RF HV power supply (13,56 MHz, ~30 kV - 50 kV, 1 kW - 3 kW) I made the assumption that the voltage for exciting plasma with DC co-relates to ...
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How to calculate laser power on photodiode?

I am completely lost calculating the power of a laser diode and hope, that someone could help me. Here is my setup: OSRAM PL 520 (Type B1 = 50mW) Green Laser Diode OSRAM SFH 203 Photodiode The laser ...
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5 votes
3 answers
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Can an LED be used as a receiver and as an emitter?

I have this idea but I do not know if it makes sense. The idea is to use a red transparent LED connected to an input of a microcontroller. In parallel it is also connected to an output of the same ...
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1 answer
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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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Howto: RF HV power supply (13,56 MHz, ~30 kV - 50 kV, 1 kW - 3 kW)

I hope you can help me on this one. Short recap about me, I am a maker and I had a vocational education some 30 years ago as engineer in HV (up to 48kV) in industrial facilities. So I am aware of the ...
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How to convert spontaneous emission into stimulated?

I have a semiconductor diode that has spontaneous emission (LED). The question is what can I change in the fabrication of the diode to improve its performance such that the diode gains a stimulated ...
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PWM Switching of 0-200mA Laser diode driver

My main goal is to create constant current source as laser diode driver between 0-200mA, controllable by 0-3.3V analog input from MCU, And can be modulated (ON/OFF only) by square 0/3.3V PWM signal (...
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0 votes
1 answer
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Laser tag IR LED beam reflection problem

I built a laser tag gun using an Arduino,but there is a problem. When I use it indoors with lens or without I have beam reflections. If I shoot on the wall the reciever also claims a "hit." ...
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2 answers
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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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0 votes
1 answer
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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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1 vote
1 answer
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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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1 answer
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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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3 votes
1 answer
293 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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0 votes
1 answer
660 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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1 answer
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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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2 votes
2 answers
181 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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1 vote
0 answers
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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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1 vote
1 answer
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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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0 votes
2 answers
172 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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0 votes
3 answers
367 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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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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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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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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1 vote
2 answers
359 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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5 votes
2 answers
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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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-1 votes
1 answer
108 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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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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2 votes
1 answer
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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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