another LT Spice question

Started by John Larkin in sci.electronics.design9 years ago 35 replies

I have this circuit driving a pulsed laser. I want to compute the energy dumped into the laser and the energy stored in the power...

I have this circuit driving a pulsed laser. I want to compute the energy dumped into the laser and the energy stored in the power supply capacitors. The ballpark is 120 amps into a 20 volt laser for a few hundred microseconds. What I did was create a "B" behavioral current source whose equation is I = V(LASER) * I(LASER) which represents power, and dump that into a 1 farad cap. The...


OT: Blinding Bugs with a Laser Pointer

Started by D from BC in sci.electronics.design5 years ago 58 replies

I saw a bug on my ceiling... Which reminded me of a utube video of a spider chasing after a laser spot. So I get the laser pointer(actually a...

I saw a bug on my ceiling... Which reminded me of a utube video of a spider chasing after a laser spot. So I get the laser pointer(actually a laser distance measurement tool) and aim it near the bug. It flies! I don't like flies and when it relanded on the ceiling I decided to do a less friendly test.. Laser blinding! muhahahhaha.... :P I rested the laser spot all over the fly. A good 30...


Laser marking/directing system

Started by Klaus Kragelund in sci.electronics.design9 months ago 54 replies

Hi I am working on a project, just for my own business I need a laser marking system, that can show a cross hair or other visible marking on...

Hi I am working on a project, just for my own business I need a laser marking system, that can show a cross hair or other visible marking on a cardboard box up to 4 meters away Initial thought would be class 1 laser (no approvals?) and then 2 steppers in a mechanical arrangement to provide x and y functions I can add a USB camera to home in the laser, so the mechanism does not need to ...


Laser Cube

Started by bitrex in sci.electronics.design1 year ago 3 replies

Some Swiss-army laser-projector box, 2.5 watts. At 2 grand it isn't cheap but in the 90s a setup like this for e.g. planetarium laser show...

Some Swiss-army laser-projector box, 2.5 watts. At 2 grand it isn't cheap but in the 90s a setup like this for e.g. planetarium laser show would've probably cost tens of thousands and definitely not luggable with one hand


Chinese Fiber Laser

Started by mpm in sci.electronics.design3 years ago 5 replies

So we just took delivery of our new Chinese fiber laser (for etching and maybe light-duty cutting operations). I believe it is a 50-watt...

So we just took delivery of our new Chinese fiber laser (for etching and maybe light-duty cutting operations). I believe it is a 50-watt unit. We got it going and was able to mark a few nameplates, etc... Of course, all the literature is in Chinese (and even some of the software). My question is: What does "TC" mean within the context of "laser on", "laser off", "polygon end",


How laser rangefinder or laser distance meter work and what chip can measure Time of Flight ?

Started by a a in sci.electronics.design2 months ago 45 replies

what chip, clocked at what frequency, is used to measure Time of Flight of laser light at sucjh short time intervals ? notjhing found on the...

what chip, clocked at what frequency, is used to measure Time of Flight of laser light at sucjh short time intervals ? notjhing found on the internet https://en.wikipedia.org/wiki/Time_of_flight https://www.fullyinstrumented.com/how-a-laser-measure-works/ https://sciencing.com/ultrasonic-sensors-work-4947693.html


benchtop CO2 laser

Started by John Larkin in sci.electronics.design3 years ago 60 replies

We make a lot of electro-optical things that are packaged in little extruded boxes. We do the artwork for, and order, polycarb stickers to go...

We make a lot of electro-optical things that are packaged in little extruded boxes. We do the artwork for, and order, polycarb stickers to go on the top of the box. That works but has some overhead. My mechanical guy has a 50 watt CO2 laser at home and did this: https://www.dropbox.com/s/94hadhmjzxzt9ec/J734_Blue_Box.JPG?raw=1 Basically the laser blasted off the blue anodize to make t...


Video monitors and CCD cameras.

Started by George Herold in sci.electronics.design10 years ago 29 replies

For one of our instruments, Diode laser spectroscopy, (http:// www.teachspin.com/instruments/diode_laser/index.shtml) We use a CCD camera and...

For one of our instruments, Diode laser spectroscopy, (http:// www.teachspin.com/instruments/diode_laser/index.shtml) We use a CCD camera and little TV to image the NIR laser spot and observe the Rubidium fluorescence. (Used to tune the laser to the correct wavelength.) So we didn=92t buy a lifetime supply of either the cameras or TVs and now they are both disappearing. (about a year...


Diode laser FM/AM modulation

Started by George Herold in sci.electronics.design6 years ago 10 replies

So we modulate the light from a diode laser by wiggling the diode current. This has two effects, the most obvious is that it changes the...

So we modulate the light from a diode laser by wiggling the diode current. This has two effects, the most obvious is that it changes the amplitude of the light. (AM) Less obvious (though I think more dominant in changing the frequency.) is that changing the laser current has two other effects on the frequency. At low frequencies (


Laser Cut Plexiglass

Started by Ricketty C in sci.electronics.design2 years ago 32 replies

I had someone today tell me it would be hard to bevel laser cut plexiglass. Anyone know if that is true? I know little about the material...

I had someone today tell me it would be hard to bevel laser cut plexiglass. Anyone know if that is true? I know little about the material really, but they talked about it splintering, etc. The issue is that it has a corner on the edge that is causing some wear to a plastic object it is pushing on. The ideas they talked about to solve this issue included some that struck me as odd like a...


optical question

Started by John Larkin in sci.electronics.design8 years ago 46 replies

We will be firing up a semiconductor laser, at a couple of watts optical output, around 1500 nm. The output will be small diameter and well...

We will be firing up a semiconductor laser, at a couple of watts optical output, around 1500 nm. The output will be small diameter and well collimated, so it will be dangerous. We can bolt our driver and the tiny laser to a metal block, and put that into a metal box with a tight-fitting cover. What should we do with the light? If we just hit an anodized surface, a lot of it will boun...


optical distance measurement

Started by Hul Tytus in sci.electronics.design5 days ago 17 replies

Anyone familiar with the optical device for measuring distance that is similar to a dual telescope. You look at an object and adjust...

Anyone familiar with the optical device for measuring distance that is similar to a dual telescope. You look at an object and adjust the device to bring the 2 images together. The distance to the object is then indicarted. Some may just indicate the angle. The one's I've seen were about 12 inches wide and 1 or 2 deep. Google only showed laser this & laser that; advertizers only apparant...


Laser Mouses might be used to predict/detect earthquakes (and ground movement).

Started by Skybuck Flying in sci.electronics.design8 years ago 27 replies

Hello, I have noticed many times by now that my laser mouse (logitech G3) is very sensitive. When the ground moves/shakes sometimes the...

Hello, I have noticed many times by now that my laser mouse (logitech G3) is very sensitive. When the ground moves/shakes sometimes the mouse will interrupt the screen saver. Today I also run one of my star trek online bots, and sikuli detected mouse movements which where recorded in a log file. It was very consistent and I don't think it was me. This constantion/observation th...


Inverse of a solar sail

Started by Carl in sci.electronics.design6 months ago 11 replies

Not directly electronics design, but todays YouTube video by Anton Petrov (https://www.youtube.com/watch?v=JM-J_VZOw60&ab_channel=AntonPetrov)...

Not directly electronics design, but todays YouTube video by Anton Petrov (https://www.youtube.com/watch?v=JM-J_VZOw60&ab_channel=AntonPetrov) was on solar sails and it made me wonder if you could turn the idea around. Instead of using a sail, why not mount a laser and create the light onboard instead of depending on incoming light from the Sun or an external laser. Like an ion driv...


Awwkk, lasers invading your home

Started by Winfield Hill in sci.electronics.design3 years ago 15 replies

Laser-Based Audio Injection on Voice-Controllable...

Laser-Based Audio Injection on Voice-Controllable Systems https://it.slashdot.org/story/19/11/04/2054230/with-a-laser-researchers-say-they-can-hack-alexa- google-home-or-siri https://lightcommands.com/ https://lightcommands.com/20191104-Light-Commands.pdf Common 60mW lasers were sufficient for the task. -- Thanks, - Win


narrow pulse generator

Started by Anonymous in sci.electronics.design1 year ago 8 replies

I want to make a narrow pulse. This will drive an e/o modulator to be an optical "fiducial" marker in a laser system. I can use a Leo Bodnar...

I want to make a narrow pulse. This will drive an e/o modulator to be an optical "fiducial" marker in a laser system. I can use a Leo Bodnar style laser driver chip to make a fast edge, but I don't know if the chip will propagate a 100 ps wide pulse. If it won't, maybe I can feed it a step and clip the output with a shorted transmission line. Making a 16.66 ohm line is a bit clumsy on ...


Commercial laser diodes

Started by George Herold in sci.electronics.design3 years ago 12 replies

Hi all, Searching for commercial laser diodes. wavlength ~600- 900 nm, power ~100mW, price

Hi all, Searching for commercial laser diodes. wavlength ~600- 900 nm, power ~100mW, price


Kinect v2 Time-of-Flight (ToF) camera + remote IR Laser Projector - to get 2D laser range meter

Started by a a in sci.electronics.design2 months ago

-https://www.dfki.de/fileadmin/user_upload/import/8767_wasenmuller2016comparison.pdf --The Kinect v1 measures the depth with the Pattern...

-https://www.dfki.de/fileadmin/user_upload/import/8767_wasenmuller2016comparison.pdf --The Kinect v1 measures the depth with the Pattern Projection principle, where a known infrared pattern is projected into the scene and out of its distortion the depth is computed. The Kinect v2 contains a Time-of-Flight (ToF) camera and determines the depth by measuring the time emitted light takes from th...


About to receive my first 3D printer

Started by Anonymous in sci.electronics.design1 year ago 12 replies

310 x 310 x 450 mm volume. I was thinking about doing an unboxing video. Dual independent head. Getting a laser too.

310 x 310 x 450 mm volume. I was thinking about doing an unboxing video. Dual independent head. Getting a laser too.


Researchers have developed a fully integrated high-power laser on a lithium niobate chip

Started by Jan Panteltje in sci.electronics.design6 months ago

Toward high-powered telecommunication systems: https://www.sciencedaily.com/releases/2022/04/220408113955.htm 60 mW output 60 GHz modulator

Toward high-powered telecommunication systems: https://www.sciencedaily.com/releases/2022/04/220408113955.htm 60 mW output 60 GHz modulator