Jr. Woodchuckington Janitor III, Esq.
the sound of a laser beam
this was unexpected. i was working on some laser effects and noticed a quiet buzzing noise. almost like an electrical arc. i did some investigation and realized the curtains were making the noise as the laser beams swept across them from forty feet away. it's pretty quiet in this video, but you can definitely hear it.
i would kind of expect this from a q-switched laser, but not anything cw.
suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.
Senior Member
... what power?
Jr. Woodchuckington Janitor III, Esq.
Maybe 3w-ish.Originally Posted by VDX
And some random chars.
suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.
Senior Member
... I'm more on lasercutting and SLS, not show-lasers --- when my lasers 'buzz', then they're evaporating material, what's visible as melted or engraved dot or trace ... this starts at 0.3Watts with a CW-laser when good focussed
But could be something with 'only' heating the target spot without melting it, so it instantly expands and creates sound waves ...
Viktor
Jr. Woodchuckington Janitor III, Esq.
what are you engraving at 300mW? my next project will be a cnc table for wood burning.
... I'm more on lasercutting and SLS, not show-lasers --- when my lasers 'buzz', then they're evaporating material, what's visible as melted or engraved dot or trace ... this starts at 0.3Watts with a CW-laser when good focussed
Viktor
suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.
Senior Member
... you can start to cut/engrave dark plastic sheets with 200mW upwards regardless of the wavelength.what are you engraving at 300mW? my next project will be a cnc table for wood burning.
Here I used an IR-diode with 975nm @ maybe 1 Watt power and a blue 455nm-diode with 500 milliwatts for cutting: http://www.reprap.org/wiki/Laser_Cutter
But most of my lasers have more power - 808nm-diodes with 1W and 25W, 975nm-diodes with 5W/9W/25W, CO2-lasertube with 40W, a fiberlaser with 1070nm @50W, and an TAE-pulse-laser with short pulses of 200ps length and 400kW power.
For cutting/engraving wood you'll need a CO2-laser with min 5Watts (AFAIK the smallest chinese CO2-tubes starts with 20Watts) - the wavelengths of 808nm to 1000nm of common IR-diodes won't be absorbed enough by wood or light/transparent organic materials, so here you'll need more than 30Watts ...
Viktor
Jr. Woodchuckington Janitor III, Esq.
i have a little 20W luxar rf waveguide co2 laser, but i was thinking of using 405nm diodes for initial setup/experimentation.
suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.
Senior Member
... which power has your 405nm-diode?
I have a 200mW type, which starts to burn paper when focussed to a spot of 0.1mm diameter, but cutting through a sheet of paper isn't really fast :-/
The 405nm-diode is meant as light-source for a DLP-beamer for UV-printing ... or collimated as replacement-laser for an old XY-scanning Sterolitho/SLA-printer from 3DS ...
Viktor
Jr. Woodchuckington Janitor III, Esq.
i was planning on combining two through a pbs cube. that will give me something approaching a watt.
suppose you're thinkin' about a plate o' shrimp. Suddenly someone'll say, like, plate, or shrimp, or plate o' shrimp out of the blue, no explanation. No point in lookin' for one, either. It's all part of a cosmic unconciousness.
Senior Member
1W would be 5 times more/faster than my 0.2W - but check first the losses through the cube.
For combinig more diodes/lasers I'll prefer 100%-mirrors - for a 'ringfocus'-laser we had to design and build the assembly stage for 20Watt-IR-diodes and two rod-lenses in one of my previous jobs ... in the end 80 of this diodes were combined by a special designed mirror-horn, so their overlayed spots averaged to 1.6kW!
Viktor
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