Interesting picture

Started by amdx in sci.electronics.design7 years ago 5 replies

Laser beam reflected from the moon while in eclipse. http://apod.nasa.gov/apod/ap140418.html "I encourage you to check out this...

Laser beam reflected from the moon while in eclipse. http://apod.nasa.gov/apod/ap140418.html "I encourage you to check out this stunning photo taken by Dan Long capturing our recent laser ranging efforts during the April 15 lunar eclipse. This is a real photo, taken through a C-11 telescope with a focal reducer (700 mm, f/2)?the outgoing laser beam has not been artificially su...


process for generating "squeezed light"

Started by Jamie M in sci.electronics.design8 years ago 1 reply

Hi, How is "squeezed light" generated, for example in the GEO600 gravitational wave detector, the laser lights frequency is given...

Hi, How is "squeezed light" generated, for example in the GEO600 gravitational wave detector, the laser lights frequency is given more uncertainty in order to reduce the shot noise (amplitude variation) of the laser light, since the amplitude variation of the laser is what is used to detect the gravity waves. What would be the method to generate "squeezed light" like this? Article on t...


Towards an electrically tunable solid state Tera Hertz laser

Started by Jan Panteltje in sci.electronics.design6 years ago 6 replies

Towards an electrically tunable solid state Tera Hertz laser: ...

Towards an electrically tunable solid state Tera Hertz laser: http://physicsworld.com/cws/article/news/2016/jan/14/plasmons-call-the-tune-in-new-graphene-base d-terahertz-laser Now that would be nice to have :-)


Small distraction

Started by Jan Panteltje in sci.electronics.design9 years ago 6 replies

Was reading http://web.mit.edu/newsoffice/2012/autonomous-robotic-plane-flies-indoors-0810.html But the laser range scanner they use costs...

Was reading http://web.mit.edu/newsoffice/2012/autonomous-robotic-plane-flies-indoors-0810.html But the laser range scanner they use costs > 5000 $ (!!!!) http://www.robotshop.com/hokuyo-utm-03lx-laser-scanning-rangefinder-2.html So, found some paper on the web that uses one webcam and laser pointer, but do not like pointing lasers around, from a flying plane would be dangerous. T


laser pulse vs trigger pulse in oscilloscope

Started by Ken S. Tucker in sci.electronics.design7 years ago 31 replies

This was posted in sci.physics.research. On Oct 24, 3:12 pm, Abner Amber wrote: > Dear Friends > I want to do some experiment in pulsed...

This was posted in sci.physics.research. On Oct 24, 3:12 pm, Abner Amber wrote: > Dear Friends > I want to do some experiment in pulsed laser. I attached output of a > laser to one channel of oscilloscope via photodiode to see the shape > of the pulse. then I attach the one output of RF trigger of the > qswitch to the other channel of the oscilloscope to see the s


Speaking* of green laser diodes.

Started by George Herold in sci.electronics.design3 years ago 50 replies

*I think it was speff and a new 3-D laser theater system. These seem to be the only good green laser...

*I think it was speff and a new 3-D laser theater system. These seem to be the only good green laser diodes https://www.digikey.com/product-detail/en/osram-opto-semiconductors-inc/PL-520_B1/PL520_B1-ND/57 19264 DK link provided. The output spectrum is terrible! 1-2 nm wide! wtf? data sheet here? https://www.osram.com/apps/product_selector/#!/?query=*&sortField=&sortOrder=&start=0&filters


White laser?

Started by Clifford Heath in sci.electronics.design6 years ago 48 replies

I'd love to hear Phil Hobbs thoughts on this. Also a discussion on new application ideas. Clifford Heath.

I'd love to hear Phil Hobbs thoughts on this. Also a discussion on new application ideas. Clifford Heath.


dumb!

Started by John Larkin in sci.electronics.design8 years ago 26 replies

This is part of a test board for a laser driver. https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/99S324A_1_p0002.jpg (here's...

This is part of a test board for a laser driver. https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/99S324A_1_p0002.jpg (here's the test board and DUT) https://dl.dropboxusercontent.com/u/53724080/Optos/D140_and_Fixture.jpg The two 0.33r resistors simulate a bar laser load. The power supply is +48 at X10 and the laser drive (current sink at X7) can be up to 150 amps. Th...


UV laser pointer ...

Started by Jan Panteltje in sci.electronics.design4 years ago

UV laser pointer ... https://www.youtube.com/watch?v=4ONp_McwJS0

UV laser pointer ... https://www.youtube.com/watch?v=4ONp_McwJS0


Can a high power (1W) laser permanently damage a traffic camera sensor?

Started by Dirk Bruere at NeoPax in sci.electronics.design7 years ago 44 replies

Just curious as to whether someone shining a 1W laser (IR to Blue wavelength) into the lens of something like a speed camera would cause permanent...

Just curious as to whether someone shining a 1W laser (IR to Blue wavelength) into the lens of something like a speed camera would cause permanent damage to it.


Laser question

Started by AK in sci.electronics.design3 years ago 29 replies

Do I need anything to limit current to this laser or just supply the correct voltage? 5mW Laser Module Emitter - Red Dot Adjustable...

Do I need anything to limit current to this laser or just supply the correct voltage? 5mW Laser Module Emitter - Red Dot Adjustable Lens Specifications Output Power: Min 2.5mW, Typical 3.0mW, Max 5.0mW Working current: Min 10mA, Typical 20mA, Max 25mA Working voltage: Min 2.3VDC, Typical 4.5VDC, Max 8.0VDC Thanks.


Ping Tim Wescott

Started by Phil Hobbs in sci.electronics.design4 years ago 2 replies

Yo, Tim! I'm licensing a very low noise laser controller to a customer. They'll be using it with combined laser/TEC modules of their own...

Yo, Tim! I'm licensing a very low noise laser controller to a customer. They'll be using it with combined laser/TEC modules of their own design, and so they need to be able to tune the temperature control loop. It would be good if that were done by changing fixed RC values rather than pots. Do you have any suggestions for software tools I could point them to, that would tell them where...


Diode laser FM/AM modulation

Started by George Herold in sci.electronics.design5 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 (


OT: Best Laser Level

Started by Jim Thompson in sci.electronics.design5 years ago 15 replies

OT: Best Laser Level... I need to establish an accurate level line over a 15' span. Recommendations? Thanks! ...

OT: Best Laser Level... I need to establish an accurate level line over a 15' span. Recommendations? Thanks! ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Que...


OT: Laser Level

Started by Jim Thompson in sci.electronics.design5 years ago 51 replies

How does a laser level work... spinning mirror? ...Jim Thompson -- | James E.Thompson ...

How does a laser level work... spinning mirror? ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | STV, Queen Creek, AZ 85142 Skype: skypeanalog | | | Voice:(480)...


PING: Hobbs, re "laser" beams

Started by Jim Thompson in sci.electronics.design4 years ago 77 replies

Hi Phil, A while back we discussed "laser" beams that could used to help guide my wife parking in the garage. (She's only 5'1" so driving up...

Hi Phil, A while back we discussed "laser" beams that could used to help guide my wife parking in the garage. (She's only 5'1" so driving up hill into the garage... all she sees is ceiling ;-) You gave me some pointers which I filed away in such a safe place I can't find them :-( I'm now about to get "round tuit" ;-) Do you remember the discussion and the pointers? Thanks! ...


Driving laser diodes

Started by Cursitor Doom in sci.electronics.design6 years ago 37 replies

So anyway, I got one of those blue laser diodes that Jan featured on here recently. It hasn't arrived yet and I don't have a spec sheet, but I'm...

So anyway, I got one of those blue laser diodes that Jan featured on here recently. It hasn't arrived yet and I don't have a spec sheet, but I'm thinking how simply it could be driven if I adopted a minimalist approach. Say it draws (plucking a figure out of thin air) 2.5A at full power. Is there any reason I shouldn't just rely on the current limiting provided by a MOSFET with a resis...


Laser Cut Plexiglass

Started by Ricketty C in sci.electronics.design1 year 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.design7 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...


Brother MFC laser "cycles" a few times per day, why?

Started by Joerg in sci.electronics.design8 years ago 60 replies

It began last week. The Brother MFC-7820N multifunction laser printer starts up out of the blue and sounds as if it wants to print...

It began last week. The Brother MFC-7820N multifunction laser printer starts up out of the blue and sounds as if it wants to print something. Fan comes on, display lights up, motors in there run. But no paper comes out and nobody requested any print via the LAN. Then it goes idle again as if nothing had happened. I know that ink jets do that to keep cartridges primed but lasers normally don't...