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Oh wow haha the m140 was a lot more square and rectangular than I thought it would be. Ok, Diachi thanks a lot for the info. Its been a great help.

Wow, I was thinking only over 10 watts would be considered a high powered laser. I guess no matter what I'll be working with a high powered laser. Well, I guess this is where the collimating lens comes into play. To help round out the beam. I know the beam still diverges slightly and isn't...

haha thanks for the response diachi. I understand their will be a lot of other things that come into play that will affect spot size. but if this were tried with a lower powered diode like the m140 at around 1W would the diameter be close to 0.1 mm?

Opps I feel embarrassed now. I did the calculation incorrectly. I converted 455nm to mm incorrectly. The correct calculations should be 0.1 mm = 1.27 x 200 mm x 0.000455 mm x 1/D D = 1.15 mm So, If I focus my beam when its diameter is 1.15 mm with a 200 mm focal lens I should get the spot...

It seems we may be looking more into using an infrared laser diode in the 800-900 nm range. Will this change my optics? Can I still use a focusing lens and a collimator to get the job done for a 100 micron spot at between 100-200mm working distance?

I have seen fiber focusers and diode couplers, which may be the option we choose. Fiber Focuser This website is selling fiber focuser with the possible specifications I require Clean Gaussian Beam Few microns up to 1mm spot sizes High power handling to over 20 Watts Large...

After taking a look at beam expanders I found these equations from this website http://www.parallax-tech.com/faq.htm for calculating spot size and depth of field spot diameter (in mm) = 1.27 x focal length x wavelength x M^2 / Diameter DOF = 2.5 x wavelength x ( f /D )^2 so by having a...

Thanks for the response Crazlaser I have read that smaller wavelengths will create smaller spots. Much of the info I found online states that smaller distances are better for creating smaller spots and as you increase distance the spot size increases. So, if I uses a single focal lens with a...

lazeristasUVISIR thanks for the response I really appreciate it. I looked at your older post and I saw in one of the threads you said: TWO LENSES: One collects and collimates, other focuses. The second lens focal length is equal of the distance from it to a focusing location. The first lens...

I am very new to optics and lasers. I understand some of the concepts involved with focusing a laser diode, but it is very general and a very small amount. I am currently building a 3d sls printer and I want to have my laser source about 8 inches (200 mm) away from the powder that is going to...