is the acronym Light Amplification by Stimulated Emission of Radiation.
1
vote
1answer
47 views
Accurately measure relative intensity noise (RIN) using RF spectral analyzer?
I'm trying to measure the relative intensity noise (RIN) of a laser using an RF spectrum analyser. It's a fairly common method (outline: ...
1
vote
3answers
90 views
Driving a laser module from 5V supply
I've got a cheapo 5mW red laser module (datasheet), it looks like its got an internal regulator, probably a thermal cutoff too. I've been having problems driving it.
First thing I tried is I ...
2
votes
4answers
139 views
Large Active Area phototransistors? And can solar cells be a replacement
Me and my friends are trying to build a laserharp driven by arduino as a learning exercise. Currently we are using a phototransistor to interrupt the laser light and play music.
However the ...
2
votes
1answer
43 views
Using a triac to switch audio signal for laser maze
So I'm building a laser maze for a science project for high schools, where we have lots of mirrors and the laser bounces around the room, when it hits the detector I want music from a source to switch ...
0
votes
0answers
59 views
impedance mismatch and signal refletions
Below figure describes the setup
impedance mismatch ( the waveform on oscilloscope )
unknown behavior after adding a couple of resistors (to match impedance) in series between the laser driver ...
1
vote
1answer
83 views
Trigger PIC-Laser
I'm having trouble to figure out one way to trigger one laser, the signal must come for one dsPIC that have 3.3V output. In my circuit I have power supply's of 3.3V,6V and 12V. The problem is that the ...
0
votes
3answers
173 views
Unable to find a source for rotary mirrors, how should I search for them?
Can someone suggest a source for rotary mirrors? I'm looking for something along the lines of the ones in the image below, but I'd be interested in any alternatives as well. (I'm building a continuous ...
3
votes
2answers
142 views
What would make a laser measuring device more accurate
I was looking a varioos laser measuring devices (laser tape measures). Most of them seem to be accurate within 1/8th of an inch. I'm wondering what the limiting factor for accuracy is. Is it simply a ...
-2
votes
1answer
124 views
I want to design a circuit for a laser rifle I'm building [closed]
I want to design a circuit for a laser rifle I'm building. The rifle is going to be based on an old rifle stock with a 16" x 1" aluminum tube for the barrel, a 500mw green laser pointer housed in the ...
0
votes
1answer
99 views
How is etalon important to tunable lasers?
Tunable lasers utilize some kind of feedback in order to maintain the same optical intensity. I've read that there is some kind of etalon trans-impedance amplifier that works in order to generate the ...
0
votes
1answer
176 views
What are pump probe measurements?
I was in class today, and we had a presentation by a student on how tunable lasers are used in fiber optics and change the wavelength. He also explained that by "pump probe measurements" a "sample ...
1
vote
1answer
190 views
How do i build a laser based tachometer?
I want to build a tachometer that has to be somewhere around 1 meter from the rotating shaft.
I'm still to build a prototybe based on IR diode and phototransistor, but I'm afraid, I would get too ...
1
vote
1answer
87 views
navigating every spot of a room [closed]
I want to build a robot that will navigate over every spot it can in a room. But i thought some kind of a laser to map the room would be best or maybe a ultra sonic sensor. Could anyone guide me in a ...
1
vote
1answer
1k views
How do I build a laser/IR target?
I am trying to make a "laser gun range" like the ones you see at carnivals for my embedded systems class at school. However, I am having trouble because I do not know how to construct the "target". I ...
6
votes
2answers
232 views
Laser related questions
I have never designed a laser device, but I have tried to read extensively on them. I'm aware of the different classes of lasers, and the dangers associated with them. For instance, I know about the ...
2
votes
1answer
113 views
Scattering matrix Transmission Matrix lasers
I would like to ask if anyone can suggest me a good tutorial about Scattering and transmission matrices for lasers.
I am really struggling with some issues and the majority of the literature analyses ...
1
vote
2answers
629 views
Help with laser diode connection
I need to connect 5V laser module looks like this one.
I connected it like an LED and it works. But i am afraid of doing something wrong.
I came across things like "laser diode drivers" such as ...
0
votes
2answers
912 views
How to connect a laser diode?
I have a circuit fed by a 5V source which receives audio signals, amplifies them, and modulates an LED so the intensity of the LED changes with the voltage.
Ok so far so good. But what I want to do ...
1
vote
3answers
261 views
Controlling piezoelectric-actuated mirror wth arduino
I would like to know where I can purchase a piezoelectric-actuated mirror device, such as those used in a single-colour laser pattern (not scanning) projector eg. the kinds used at music ...
-1
votes
1answer
144 views
trip beam sensor [closed]
I need a trip wire sensor, like a laser and a reflector, and or a infrared version.
I am doing the cabling for a walk through attraction and will at some stage need also a PIR. Basically all these ...
2
votes
3answers
361 views
Laser for drilling very small holes
I have seen examples of repurposing cd-r/w or dvd-r/w lasers to use for laser pointers or even 'burning' lasers. I have a project in mind, and I am hoping to make holes in a pingpong ball that range ...
4
votes
3answers
292 views
Laser - damaging to your eyes?
Will a <5mW laser Class IIIa become less dangerous to the eye if I supply it will less current/voltage? Or is it something about the laser itself that makes it dangerous?
0
votes
1answer
666 views
Driving 3-4v laser from 5v arduino
I want to control the following laser module from an arduino digital output:
Specification V2 – Aug 2010
Wavelength : 650nm +/-5nm
Output Power : 4-5mW
Operating Voltage: V2 = 3.0-4.0V
Operating ...
3
votes
4answers
2k views
Driving an LED/Laser diode with a RF signal up to 20 MHz
I'm trying to design a circuit that will let me drive an LED or Diode laser with a RF signal up to ~20 MHz or so. Since the optical device will need to be biased with a DC current, a bias -t is a ...
1
vote
1answer
638 views
Simple constant current source that doesn't die on voltage spikes
For testing various laser diodes, I need a constant current source, adjustable up to 150 ... 200 mA or so, down to... well, maybe 1 or 2 mA? (low enough to measure where is the lasing threshold where ...
2
votes
3answers
218 views
Is a class I infra red laser range finder with range 30-40 metres possible?
For our warehouse, we need to build a range finder for monitoring purposes. We have the following constraints:
Use infra red lasers only
Range should be at least 30 metres
Only class 1 lasers ...
7
votes
3answers
1k views
Decomposing Kinect Laser Projector - Is it really safe?
I am looking at Kinect Laser and couple of things that are not clear, so I thought I bring up here.
First the known facts:
- Kinect has a laser projector that works at 840nm
- Output power of the ...
3
votes
4answers
705 views
How to terminate 50 ohm transmission line without drawing DC
I am sending a 10 MB/sec digital data stream by amplitude moduating a infrared quantum cascade laser. The laser requires a hefty bias of about half an amp (which drops about 8.5 volts across the ...
3
votes
2answers
740 views
Laser driver circuit
I like to build a laser pointer driver circuit that I can drive from an 8 bit uC. However, I like to get light output fairly constant. This requires for me to look at the photo detector (these lasers ...
0
votes
2answers
165 views
Does solid state maser exist?
In my student years we studied the microwave quantum device, equivalent to laser, named maser. It worked on ammonia molecules, so it was not a solid state. It has phenomenal specs, as quantum device ...
6
votes
4answers
640 views
Short Distance sensitive laser range finder
I am looking for a reference design for a laser range estimator. I actually don't want to measure the absolute distance but the relative position of the object that is interest. i.e. if it is getting ...
2
votes
1answer
143 views
Laser strobe for Point Grey camera
I'm currently building a triangulation-based laser rangefinder with a camera and a number of laser pointers. Something that I'm interested in doing is using the strobe output from my Point Grey ...
0
votes
4answers
419 views
Using a DVD diode to create a mag-lite laser
So, I decided I wanted to make my very first foray into some basic electronics. I decided I was going to attempt to make a laser mag-lite, as per this hack here. The steps seem pretty straight ...
5
votes
2answers
69 views
Infrared Filtering from Laser Modules and Wattage Considerations
I have come across a project which used this Chinese laser module. Apparently from someone who worked with the mentioned laser, it emits IR light (noise) even though it's a green laser. While I was ...
2
votes
2answers
232 views
Laser Diode Security System
I'm thinking about making my own laser security system (think mission impossible). So I was thinking I'd use a laser diode to shine a beam across a doorway into a light dependent resistor that's on ...
2
votes
2answers
509 views
Why is a laser supply so tricky?
I need to build supply for ~20 laser diodes (~150 mW each), and the question is why can't we just use a constant current power source for each of them?
A similar question for pulsed mode operation: ...
1
vote
1answer
123 views
reading raw data from a cdrom
Can you point me some technical resources on how cdrom works and is it possible or lets say how easy to make a diy cdrom ? I am interested in reading and processing raw data from cd, not using a chip ...
2
votes
1answer
229 views
How to choose laser galvanometers
I am currently looking to purchase laser galvanometers like this and this. However, as I'm not familiar with lasers, I'm not sure the criteria I should use to evaluate whether a given product is a ...
5
votes
1answer
1k views
I need to design a Bias-T circuit for a diode laser - help choosing component values
I need to modulate a diode laser with a RF source. I've found parts on Minicircuits that can do this, but I'd like to have the Bias-T and amp on my own PCB. So, I need to design a bias-T circuit that ...
4
votes
3answers
2k views
Best way of making a trip-wire type device?
I'm wanting to make a type of electronic "trip wire".
My basic idea is to have like a laser and basically when the laser is interrupted then it sends some signal to a microprocessor.
I'm not tied ...
13
votes
3answers
2k views
Any published designs for time-of-flight laser distance measurement
Does anyone have any references/examples for detailed circuitry for time-of-flight laser distance measurements - schematics, appnotes etc.?
5
votes
4answers
226 views
Reasonably priced laser cutting service in the UK?
Has anyone had any experiences with laser cutting services in the UK? I've googled but most of the results seem to be for expensive industrial setups. What I'm looking for is someone who can do pretty ...
4
votes
6answers
2k views
What kind of laser should I get to cut fabric?
I'm brainstorming a new project with my wife and was wondering
what type of laser I could use to cut multiple layers of fabric?
F.Y.I.
I'm a total noob when it comes to lasers and integrated ...
