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True, the wide beam puts some stress on the paraxial approximation, but the objective isn't a thin lens either. If microscopists can live with plan achromat objectives, probably my beginner level holography isn't going to suffer much. If I do find spherical aberration causing trouble, then I'll just...

reference for the lens Bechhoefer, J., & Wilson, S. (2002). Faster, cheaper, safer optical tweezers for the undergraduate laboratory. American Journal of Physics, 70(4), 393-400. lens discussed in section II.B., last paragraph. John, indeed you located me. If you ever venture toward Huntsville, ...

I wish I was in John's shoes, having my memory serve me so well. I love how figure 1 in Dr. Jeong's article shows that a wider collimated input beam produces a larger divergence. But what it cannot show is that the wider input beam produces a narrower spot size (or beam waist) before the beam begins...

Yes, I have heard many times that physics PhDs aren't fit for any real jobs outside academics. May be true in my case. Alas, X ray diffraction is the province of solid state physicists. Their beamtime at the synchrotron was measured in hours. Whereas we atom physicists studied ionizing collisions wi...

The 40X (N.A. = 0.65) has beam divergence of 80 degree only if the incident beam fills the objective's entire aperture. The N.A. is roughly proportional to diameter of the aperture/beam size. When you go from the 6 mm diameter aperture of a 40X objective to, say, a 2 mm diameter beam, then the N.A. ...

Okay this is probably a silly question or two from a newbie just putting things together to get started, but here goes. Do most people just send an unaltered laser beam into the microscope objective? I'm wondering, because it seems that objective magnification and pinhole size pairs I've seen mentio...

Petr, Ed, and Dinesh, thank you for the warm welcome. I think you guys have filled my book request list for the year. Ed, I have perused the forum for a while. So I have visited your website and read over the 7 single beam projects. I'm sure these projects will be the first things we try. I (and my ...

Hello Last fall, the idea to make a hologram first came to me. So I found the Integraf website. I read how to make a single-beam reflection hologram, and thought "I can do that." I purchased plates and developing chemicals from Integraf and set up to make a three-color hologram of a shiny ...