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LOL Missed that part about the small lens. I did not want to waste my calculations looking what you are looking for.

Lens surface powers should be added. For Lens 1: +9 + (-1.25) = +7.75D. (Not +10.65) +7.75D -> f = 1/LensPower = 129 mm For Lens 2: +12.35 - 6.5 = +5.85D. (Not +6.75) +5.85D -> f= 170 mm. You should have a divergent lens too to make an real expander, as a combination of those two lenses will...

You missed a concave part :san:

This is not a common way to describe lenses for lasers. Most often surfaces radii are dimensioned in mm, and focal length in mm (not dioptic power) The first lens is confusing too Plano Convex but then you write about convex and concave. :thinking: As both lenses are +, you'll build a...

Do you want to order custom made coated lenses of a very small quantity? That might cost a lot. :whistle: As suggested look what is available at other companies like EO, Thorlabs, Newport, CVI/Melles Griot. As to your question: 532 nm +/- 1 nm. Even 0.5 nm. 445 is more tricky. NDB7875...

Did you write more about this monster?

The true beam expander uses at least 2 lenses. The first expands the beam, the second collimates it. Telephoto (a long focal length lens >100 mm) needs an additional short focal length lens like a prime 50mm or shorter. The result will be a huge expander, and not easy to carry or hold.

S and P polarizations matter only with a reference to a reflecting surface. With a rectangular housing as yours you talk about vertical or horizontal polarizations when the housing base is mounted on a horizontal table. Even if you have no polarizer you could figure out with a glass plate...

I checked Mitsi diodes. They have 0.5 W and some experimental 1.8 W. That would take a lot of diodes to get to >7 W (meaning $$$). However, they can produce more power [almost double] if modulated. Can your treatment done with pulsed lasers?

Do you know the fiber size you want?

Sort companies by name. When you'll update a list just add "new" to the newest links.

Generally it is a complicated question. In principle, a cylindrical mode can be decomposed into rectangular modes and vice verse. Look what a math formula is "easiest" to use to define your beam and its propagation.

It is not that simple to get a formula for "color". The scattering is different in atmosphere for different wavelengths (blue sky, red sunset etc). The same size beams have different divergence thus with propagation color might change. rhd recommended Chroma is a good start.

Yup, especially with a low power. The rectangular shape is due to different divergences on perpendicular axes of the beam. With additional optics [like prisms or cylindrical lenses] it can be compensated and the beam become round The 532-nm laser beams are quite nice round shape, but the mode is...

Grey??? Sounds like a dress problem too :drool: To me it's dark red. :whistle:

In morning I saw a dark dress. Now (midday) it is white/gold. I have a weird color blindness. Internet is full of all kind for self-tests. Just check the pic from Color blindness - Wikipedia, the free encyclopedia I'm the one who sees 21 LOL Normal people sees 74. I've no problems to see 808...

Have you more specs? NA? Back focal length? I assume OD 7 mm, yes?

The picture should show both laser lines. Then at least relative intensities can be compared. With manual camera settings it is possible to get anything.

Can you or a manufacturer reduce power of your laser? It is simpler than increase above specs :) You can place a filter in the front of your laser to reduce power to a safe level.

Some kind of a laser tagging game? OD 1.3 will reduce more than 10x. It might be sufficient if you would not point directly in to faces. Maybe your application can work with expanded beams thus reducing effecting power.