Non linear CGH

Holography related topics.
Din
Posts: 406
Joined: Thu Mar 12, 2015 4:47 pm

Non linear CGH

Post by Din »

https://opg.optica.org/ViewMedia.cfm?r= ... 2A.1&seq=0

I thought this was interesting. Non-linear CGH can alter the phase and amplitude of a Gaussian beam. From the paper:

"Specifically, nonlinear CGH were recently used to convert a fundamental Gaussian beam into high order
Hermite-Gauss or Laguerre-Gauss beam at the second harmonic [1-4].

[1] A. Shapira, I. Juwiler and A. Arie, Opt. Lett. 36, 3015 (2011)
[2] N. Voloch-Bloch, K. Shemer, A. Shapira, R. Shiloh, I. Juwiler, and A. Arie, Phys. Rev. Lett. 108, 233902 (2012).
[3] A. Shapira, R. Shiloh, I. Juwiler and A. Arie, Opt. Lett. 37, 2136 (2012).
[4] A. Shapira, I. Juwiler and A. Arie, Lasers and Photonics Reviews 7, L25 (2013)."

As some of you might know, Laguerre-Gauss beams carry angular momentum, and can, therefore, cause particles to rotate, hence these beams are called "optical vortices". They're not easy to produce, but now a computer generated hologram can produce them.