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Don't worry. See the Sanwu thread. Before purchasing see if it is a Chinese holiday because that will delay your order and email correspondence.

Excluding white lasers think through what is wrong with the idea of a black beam producing laser.

Not knowing how to keyword search the web is something many do not know how to do.

Blues diodes do have higher wattage. But you have not apparently considered the beam characteristics.

The question has too many variables to answer precisely. At best only a very rough estimate can be given which you hinted at How many beams does a diffraction grating create? That's one of the variables.

Peak visual sensitivity is 555.5 nm. https://slickscreen.github.io/laser-tools/brightness/ Multimode refers to the operation of the switch. Actual multimode refers to a laser beams profile. TEM00 is a Gaussian profile. Other profiles are TEM01, TEM02...

I don't think this has been mentioned; knowledge is what you need to build a laser.

What better way to educate than point this employer to this site so he can read for himself the consequences of an unsafe workplace? If he will not take sound advice than let him suffer the outcomes should they happen As for you put your concerns on the back burner as you've done all you can

OSHA might have something to say about it

What country do you reside in?

What country do you live in?

Keeppower batteries. Efest too

Correct. When I click the Share button what I paste is this. Spaces are my doing.

I did. Let's try again Still not working

Don't know why it says unavailable. follow the direction or go directly to his site

Found this vid on YT. Click the YT icon lower right corner. The channel is Les' Labratory

There are none

Multi watt. The only way to see for yourself is to carry out some experiments. Start with that 1.4W laser if you have one. That would be a good wavelength since it is 10nm short of peak photopic sensitivity.

Not possible given what you are currently using. There are many factors needed for that to happen. The first would be to have better than 20/20 vision.

Check "Surplus Shed" for large diameter lenses.