Which direction to put 660nm glass lens?

[arcaneinsomniac]

EDIT: Silly me. Both ends have the AR coating. I really doubt either way makes a difference.

I got one of these for $10 from Kendall for use with the LPC diode but I'm not sure which direction to put the lens in. One side has the blue AR coating. Seems to me I should be putting this end towards the diode?

 

[ndrew2505]

the end that looks solid(i.e. no threaded part for holding the lens in) points out. it will have 2 grooves on either side for a spanner wrench.

edit: in the pic the end facing you will be the end that points outward.

http://www.modwerx.com/shop/laser-m...for-laser-focusing-modules-red-635-670nm-p-37

 

[arcaneinsomniac]

That makes sense. Thanks

 

[LtKernelPanic]

Thanks for the info. I've always put the spanner end down which for uncoated lenses wouldn't matter I guess. I'll be putting the coated lenses I bought a few months ago to use shortly and will make sure to put them in correctly now.

 

[RA_pierce]

Thanks for the info. I've always put the spanner end down which for uncoated lenses wouldn't matter I guess. I'll be putting the coated lenses I bought a few months ago to use shortly and will make sure to put them in correctly now.

Coated or uncoated does not make a difference.
If the lens is in backwards, it is in backwards.

 

[arcaneinsomniac]

To verify that, you mean by "points out" the direction toward the diode?

 

[ndrew2505]

"points out" means "points out" otherwise it would "point in" towards the diode