Cheap, big FS mirrors

[Dr_Evil]

I found these while looking at flashlight stuff. They are 40mm x 3mm FS mirrors for $4 each. I'll probably order a couple at that price just to see how they are.

40.0mm x 3mm Front Surface Coated Mirror - Flashlightlens.com - Online Store

 

[IsaacT]

Nice find!!! Let us know how they turn out!

 

[starlight]

That is a good price. I have 6 huge (3 foot x 4 foot) fs mirrors I've removed from DLP TV's in the past week that I 'm not sure what to do with. Want them cut into manageable sizes.

 

[Dr_Evil]

I ordered a couple. I assume they are glass but I'll find out when they get here.

 

[ChaosLord]

Nice find, +rep

 

[Dr_Evil]

An initial quick test shows they reflect at least 96%. They are glass. I don't have anything above a watt to see how well they'll hold up to high powers though.

 

[Dr_Evil]

These are the measurements I got with the Laserbee 1.

wavelength - without mirror - with mirror - percentage

405 - 296 - 261 - 88.175
445 - 801 - 746 - 93.133
450 - 76 - 72 - 94.736
520 - 42 - 41 - 97.619
532 - 314 - 298 - 94.904
589 - 109 - 104 - 95.412
638 - 96 - 85 - 88.541
660 - 254 - 232 - 91.338

This testing was done with the other mirror I ordered at the same time. I gave the first one to somebody else. The DPSS measurements might be off a little bit just due to their natural instability although I just used the peak reading of each laser. The readings are probably off just a little bit over all due to battery drainage between one reading and the other along with different spots of the mirror being used. The coating does look uniform to the naked eye though.

 

[Bionic-Badger]

You can get good thick FS mirrors from Surplus Shed too. 10 for $10. Stuff it in your wishlist and when they have a sale, buy a bunch.

 

[Dr_Evil]

I just bought some of those during the sale. The percentage of light reflected sucks. Only about 75% was being reflected on the few wavelengths I tested.

 

[Bionic-Badger]

Really? I guess I'll have to see how they are when mine arrive. I got some other FSMs from there too.

 

[Dr_Evil]

I also picked up some of these. They are better. Maybe 1-2% lower. That's good enough for me though as I just plan on using them to bounce beams around my garage or living room.

http://www.surplusshed.com/pages/item/l13522.html