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another LT Spice question

Started by John Larkin in sci.electronics.design11 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.design7 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.design2 years 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.design3 years 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


Laser resonates with ceiling speaker to create a horrible ?ground loop?

Started by Don in sci.electronics.design2 years ago 7 replies

Received a phone call from a client in regards to a new medical laser device. Whenever the laser is activated it causes a sympathetic loud hum...

Received a phone call from a client in regards to a new medical laser device. Whenever the laser is activated it causes a sympathetic loud hum in only one of the Valcom ceiling speakers - located relatively far away in the waiting room. Speakers closer to the laser show no symptoms. Haven't gone on-site yet. AFAIR, a sheilded audio cable feeds the speakers, and a LM386 drives them. The b...


Video monitors and CCD cameras.

Started by George Herold in sci.electronics.design12 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...


End Laser Envy

Started by Mike Monett VE3BTI in sci.electronics.design9 months ago 20 replies

Still playing with Inkjet printers and paying outrageous prices for ink that dries out? Looking at lasers but finding the price too...

Still playing with Inkjet printers and paying outrageous prices for ink that dries out? Looking at lasers but finding the price too high? Voila. Canon released a black and white laser printer for $99, with Canon quality and reliability. USB interface. Buy it here: Canon imageCLASS MF3010 Laser Multifunction Printer, Black https://www.amazon.ca/dp/B00DU7K50A Or in the states h...


Ionic liquids' good vibrations change laser colors with ease

Started by panteltje in sci.electronics.design1 year ago

Ionic liquids' good vibrations change laser colors with ease https://www.sciencedaily.com/releases/2023/01/230119133344.htm orange laser!

Ionic liquids' good vibrations change laser colors with ease https://www.sciencedaily.com/releases/2023/01/230119133344.htm orange laser!


temperature compensating a laser diode

Started by John Larkin in sci.electronics.design7 months ago 5 replies

LEDs and lasers get way more efficient when they are cold. But their junction drop increases too. So it seems that driving them from...

LEDs and lasers get way more efficient when they are cold. But their junction drop increases too. So it seems that driving them from some magical Thevenin source would temperature compensate the light output. Has anyone done this? I need to hold some dBm level from a laser source from -40 to +85C and that might be a simple way to do it.


Diode laser FM/AM modulation

Started by George Herold in sci.electronics.design7 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.design4 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.design10 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.design2 years 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...


Inverse of a solar sail

Started by Carl in sci.electronics.design2 years 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...


narrow pulse generator

Started by Anonymous in sci.electronics.design3 years 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 ...


About to receive my first 3D printer

Started by Anonymous in sci.electronics.design3 years 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.


Cute dpot hack for increased resolution

Started by Phil Hobbs in sci.electronics.design4 years ago 44 replies

So I'm doing a simplified version of the differential laser noise canceller, which in the spherical cow universe looks like it does very well...

So I'm doing a simplified version of the differential laser noise canceller, which in the spherical cow universe looks like it does very well out to about 10 MHz, thanks to the amazing properties of BFP640s and some new photodiodes with reduced series resistance. (At least according to Hamamatsu.) One thing I need for this is an adjustable resistance with good bandwidth. The fastest...


TI opamp

Started by John Larkin in sci.electronics.design9 years ago 46 replies

Has anybody used this one? http://www.ti.com/product/lme49990 Sounds too good to be true. -- John Larkin Highland...

Has anybody used this one? http://www.ti.com/product/lme49990 Sounds too good to be true. -- John Larkin Highland Technology, Inc picosecond timing laser drivers and controllers jlarkin att highlandtechnology dott com http://www.highlandtechnology.com


OT: More Win7 Crap

Started by Jim Thompson in sci.electronics.design9 years ago 52 replies

OT: More Win7 Crap... Periodically I'm getting "Some printing features are currently unavailable", or some phrase similar to that. Like, I...

OT: More Win7 Crap... Periodically I'm getting "Some printing features are currently unavailable", or some phrase similar to that. Like, I can print to my hp Laser Jet P2015dn, but not be able to select double-sided ?? Never happened with WinXP. Any idea of the cause? ...Jim Thompson -- | James E.Thompson ...


printing with formfeeds

Started by John Larkin in sci.electronics.design3 years ago 26 replies

I have some old assembly listing files that are text, paged by formfeed characters. I can't find a way to print nice listings on a modern laser...

I have some old assembly listing files that are text, paged by formfeed characters. I can't find a way to print nice listings on a modern laser printer/copier. They ignore the formfeeds or print a black box. Any ideas? Maybe I could write a program to replace the ff's with a control sequence or something?