What is the smallest spot size of the laser on Dimension FastScan Bio?

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Teddy Huang replied on Tue, Mar 17 2015 9:56 AM

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I'm checking this for you. Please follow up by sending email to afm.support@bruker.com

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Teddy Huang replied on Tue, Mar 17 2015 12:07 PM

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Hi Krishnashish,

See note here "the aperture diameter for the small spot size is 0.118” +0.002”/-0.000. Laser power is set to 1.15mW and the laser is focused manually to achieve maximum roundness with minimal shadow"

Thanks,

Teddy

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Krishnashish Bose replied on Tue, Mar 17 2015 12:12 PM

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Thanks Teddy for your answer.

I asked for the smallest spot size (in um) of the laser on the cantilever, not the focussing aperture.

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Teddy Huang replied on Wed, Mar 18 2015 10:02 AM

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More notes from engineer.

“We have not measured that, but the customer might be able to get a rough estimate by using the dimensions of the FASTSCAN-A probe listed on the box and comparing the spot size to the probe size. The spot size will also vary for each system since the spot is manually focused, so there’s not one typical spot size for all systems.”

“You can also focus on the edge surface of a sample grid.

Then go to setup and move the tip away from the laser so that the laser hits directly on the sample.

Go back to navigate and compare the spot to the grid to get the measurement.

Note: the surface focus and tip focus are on the same focal plane, so this should give you the most accurate measurement.”

My personal note: the laser spot you can see is due to the light scattering on the surface. This can be only used as a rough estimation of the beam size.