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| argengraph:
I need to downsize particles to the nanometer level by laser ablation in liquid and I have the following information: Ten shots of laser (0.1 J each pulse energy) irradiated using a laser source with a power density of 1.2×10^9 W/cm2 horizontal pulsed laser beam (355nm, third harmonic, 10ns pulse width) at a repetition rate of 10Hz focusing the pulsed laser beam to a diameter of around 1mm. Is this information enough to determine a laser equipment ? |
| dmills:
Third harmonic YAG laser, Q Switched, of the fairly short pulse kind. 0.1J in 10ns is a fairly high peak power level, 10MW peak, 1W average unless I have dropped a decimal somewhere? Might be some pulse compression involved to get the peak power level? NOT going to be cheap. Coherent are a likely vendor for a (probably) optically pumped YAG, but I also wonder about exceminer lasers as possibly a cheaper short UV pulse source, got issues of their own, but might be worth a look. Another thought is N2 gas lasers, might struggle with the PRF but they are fairly cheap as these things go, and have copious peak power in the UV. |
| ejeffrey:
--- Quote from: argengraph on May 13, 2019, 08:56:21 pm ---I need to downsize particles to the nanometer level by laser ablation in liquid and I have the following information: Ten shots of laser (0.1 J each pulse energy) irradiated using a laser source with a power density of 1.2×10^9 W/cm2 horizontal pulsed laser beam (355nm, third harmonic, 10ns pulse width) at a repetition rate of 10Hz focusing the pulsed laser beam to a diameter of around 1mm. Is this information enough to determine a laser equipment ? --- End quote --- These are fairly standard specs for applications like laser ablation. Spectra-physics has an assortment of suitable lasers: https://www.spectra-physics.com/products/high-energy-pulsed-lasers/ Coherent will have a similar assortment. Be prepared to pay $$$. I haven't shopped for high power lasers in a long time and never this sort of application, but my rough guess is $100k? It will also depend on whether you are an industrial or academic customer. As dmills said, there are other options that are cheaper, but will require more leg work on your side to figure out what is appropriate. You might also have to do some more process development if you end up with a laser with different pulse energy, wavelength, or pulse length. You might also be able to find one used for a lot less, but in variable condition. Still, you might be able to get a used laser, clean or replace a few optics or buy a new set of pump diodes and be in business. Those are expensive, but a lot less than the full laser. |
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