Excellent video on such important topic for laser diodes. Is it possible to use the Achromatic Anamorphic Prisms pairs of the same glass type and get great beam spot size? Why two different glass types are needed?
Using two glass types helps to keep the outgoing angle and height the same for all wavelengths. But as I found, it isn't perfect. You certainly can use two prisms of the same glass type, which just means a little more variation with wavelength in the outgoing angle. Using two different glasses doesn't affect the beam quality for monochromatic light, but it does help to keep all colors on the same path if the spectrum is broad.
it does sound a lot easier to shove two prisms on lil mounts so i can fiddle with mounting angles, than it does to align a semi-cylindrical with 5 degrees of freedom... as i see it... diode to lens distance. 1dof squaring lens in two planes so flat face is perpendicular to beam.3dof. shifting lens on one axis to centralise on beam. 4dof. rotating lens to diode. 5dof. only a linear movement in one plane has no significance... along the axis of the lens curvature. arrrgh! whereas this... flat surface. diode height/central line... fixed. diode rotate to surface. fixed. prism to diode distance. fixed. only needs adjustment to "stay in frame", right? (but is it better to try and cover the largest surface possible, or to focus first? spreading it out suggests higher losses through the air/glass transition, whereas focusing it suggests more chance of damaging the lens/coating?) angle of incidence. secondary angle of incidence. and should be easily sealed up once actually sorted out so no nasties escape. or bugs get in. damn bugs. hmmm. would love to see this for real with some fog...
Beautiful work. Thankyou! You are an absolute treasure.
As a computer scientist all I see are chains of matrix operations :)
Thanks for the nice compliment. If you can see the matrix operations, then you're the real deal, because that's exactly right.
Very important video for laser diode application. Thank you.
Thanks for these videos. I wish I had seen these 30 years ago!
Thank you sir for the video
Most welcome
Excellent video on such important topic for laser diodes. Is it possible to use the Achromatic Anamorphic Prisms pairs of the same glass type and get great beam spot size? Why two different glass types are needed?
Using two glass types helps to keep the outgoing angle and height the same for all wavelengths. But as I found, it isn't perfect. You certainly can use two prisms of the same glass type, which just means a little more variation with wavelength in the outgoing angle. Using two different glasses doesn't affect the beam quality for monochromatic light, but it does help to keep all colors on the same path if the spectrum is broad.
it does sound a lot easier to shove two prisms on lil mounts so i can fiddle with mounting angles, than it does to align a semi-cylindrical with 5 degrees of freedom...
as i see it... diode to lens distance. 1dof
squaring lens in two planes so flat face is perpendicular to beam.3dof.
shifting lens on one axis to centralise on beam. 4dof.
rotating lens to diode. 5dof.
only a linear movement in one plane has no significance... along the axis of the lens curvature.
arrrgh!
whereas this... flat surface.
diode height/central line... fixed.
diode rotate to surface. fixed.
prism to diode distance. fixed. only needs adjustment to "stay in frame", right? (but is it better to try and cover the largest surface possible, or to focus first? spreading it out suggests higher losses through the air/glass transition, whereas focusing it suggests more chance of damaging the lens/coating?)
angle of incidence.
secondary angle of incidence.
and should be easily sealed up once actually sorted out so no nasties escape. or bugs get in. damn bugs.
hmmm. would love to see this for real with some fog...