Assaf Halevy

7 Questions 23 Answers 0 Followers

Questions related from Assaf Halevy

Any recommendations for large-sized photopic-like filter?

I'm looking for large sheets (~tens of cm) of a filter/material with transmission that resembles the photopic response of the human eye: it should block longer wavelengths than ~700 nm and shorter...

10 October 2018 2,394 0 View

Does IAD coating degrade over time compared to IBS coating?

Hi, Is it true that at first IAD and IBS coated optical elements may behave similarly, but over time the IAD coating may peel off or degrade, especially when exposed to humidity or high-power...

01 January 2016 8,108 2 View

What is the origin of interference patterns generated by a laser diode?

Hi, I'm using a regular cheap low-power laser diode followed by a collimating lens and see several interference patterns on the laser spot (see attached pic). I know these patterns do not...

04 April 2015 4,262 13 View

What laser diodes are typically-used in DVD players?

Hi, I know that Sony used to produce self pulsating red laser diodes for DVD players, but they are no longer being manufactured (at least not by Sony). From my searches it seems that all DVD...

07 July 2014 5,248 5 View

Can anyone recommend a commercially-available system for lens aberration measurements?

Hi, I'm looking for an off-the-shelf product that allows estimating lens aberattions. I'll be happy to hear your suggestions, Thanks, Assaf

07 July 2014 2,278 7 View

Can anyone comment on cutting wave plates from birefringent bulk crystals?

The attached figure (taken from Optics\E. Hecht) shows a calcite bulk crystal in a cleavage form with a wave plate cut parallel to the optic axis. From the symmetry of the index ellipsoid there...

05 May 2014 1,468 7 View

Is there a way to rotate an image by 90 deg. without using a Dove prism at 45 deg.?

I'm using convergent light, and I found out that Dove prisms should be used only with collimated light (in order to minimize aberrations). Thanks!

04 April 2014 3,087 4 View