Description
Every laser comes with a calibration card telling you the wavelength (every laser is a little different – usually 650 to 660nm). Every laser runs on normal USB power (5v) which comes from phone chargers, USB cigarette adapters, USB batteries, computers, laptops, etc. Comes with 1 meter long power cord. You must supply your own USB power source.
Laser holder included.
The main disadvantage versus the more expensive “glass” laser I sell is that it is harder to clean – especially the inner side of the lens which is deep inset as you can see in the pictures so you need a q-tip and it can take me 20 minutes and 10 tries to get all the dirt out. The lens is probably glass (seller claimed it was glass). It certainly doesn’t scratch easily.
I test and clean every laser to make sure there is almost zero dirt/dust on the collimating laser and that the beam has about 1.7mm usable width.
See diagram in product images to help understand the following
The beam diameter is 1.7mm The mirror coverage depends on your diverger. Formula is:
F/# mirror coverage = lens F.L. / 2 / laser_diameter
minimum recommended column has 50% extra coverage
Don’t just automatically go for the lowest # (F/2.2) as there are tradeoffs – you will have a dimmer beam (so harder to work with) and the noise/dirt/spatial noise will be more of an issue. Caused by microscopic defects in laser lens, diverging lens, splitter and flat. They will be more annoying and make it harder to get great interferograms .
| Laser type | Diverger focal length | minimum F/# of mirror under test |
|---|---|---|
| regular laser 1.7mm beam | 7.65 | F/3.3 |
| regular laser 1.7mm beam | 10 | F/4.0 |
| regular laser 1.7mm beam | 13 | F/4.7 |
| regular laser 1.7mm beam | 20 | F/8 |
| “Glass” laser | 7.65 | F/2.2 |
| “Glass” laser | 10 | F/2.8 |
| “Glass” laser | 13 | F/3.7 |
| “Glass” laser | 20 | F/5.4 |
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