FAQ: BMC Deformable Mirrors: Windows

Posted by Angelica Perrone on Wed, Mar 26, 2014 @ 09:51 AM

For those interested in using our deformable mirrors with laser applications, there are a few common questions which are asked in regards to the AR-coated window and if it is/can be removable.  Below is a summary of what's standard and what's possible:

Both the optical modulator and our DMs are protected by a 3mm thick window, which are standard BK-7 windows from Thorlabs. The options for windows are: 

  • 350-700nm
  • 400-1100nm
  • 650-1050nm
  • 1050-1620nm
  • 550nm-2400nm

This can also be customized upon request. The windows are mounted on a 6° angle in order to prevent ghosting. 

A lot of requests are in regards to removing the protective window. For our standard DMs, the window is not removable as it is attached with an epoxy. For our modulators, the window IS removable. We highly recommend you DO NOT REMOVE the protective window. The only exception to not having an AR-coated window would be if the DM was operated in a clean room environment.  In this case, we can deliver the modulator or DM without the window and include a protective removable lid instead. In addition, we recommend flowing Nitrogen at a very slow pace around the mirror to ensure the humidity remains low around the DM. The required humidity is <30% as the mirror is made of polysilicon which needs to be protected from corrosion. 

 Please visit our website or contact us for additional questions.

deformable mirrors, BMC,adaptive optics

Tags: deformable mirror, laser beam, laser science, ultrafast lasers, CW, Coatings