DLP9500: DLP9500

Hello Huang,

I need to clarify some things:

• Is this exactly the same DMD or same part number but a different DMD?
• Is the incident angle the same for both cases?
• Is this the same laser?
• Is the DMD operating or parked?
• Do you happen to have pictures of before and pictures from now?

The variation in flatness of the mirrors will not account for what you are describing.

Fizix

Dear Fizix,

Yes, these two DMD are totally same, and also be used in totally same system at parked state. We think it just should just like one mirror.

So we are confused and we check this newer one seems functionally work well.

Attached pls find these pictures. Thank you!

Older One

Newer One

Hello Huang,

Thank you for the pictures they help.  Is this is the image of a single pixel turned on?

This looks like a far field image with no converging optics.  Is that correct?

I would like to consult with our optics team on this question.  Please allow a couple of business days to get their input.

Fizix

Hi Fizix,

Yes, these image is modulated.

Here I share you some other images as below.

Older One, Far field

Older One, Near field

Newer One, Far field

Newer One, Near field

We also used one mirror instead of DMD to check the laser spot on turn-off state.

Mirror,

So, it seems the image is distorted very worse.

Thank you!

Hello Huang,

Thank you again for the new pictures.

Let me now consult with the optics team on this.

Fizix

Hello Fizix,

How is going on with this issues? Thank you!

Hello Huang,

 They are still looking at this.  I will ask them again today. 

Fizix

Hello again Huang,

The optical team indicates there is not enough information here to make any significant evaluation.  They have asked for the following information:

• Please share the optical system, wavelength of the laser and f/# and AOI of the illumination.
• What is the parked state they refer to?  Are the mirrors flat?  Is this FULL ON STATE?
• How much of the DMD active array of mirrors are being illuminated?  A single mirror?  If not, how many mirrors?
• If the mirror array is being sub illuminated, try illuminated a different section of the mirror array and see if the results are the same.
• When swapping DMDs, are the Far fields in the same location?
• What are the serial numbers on the DMDs and which is the “good” one and which is the “bad” one.
• The DMDs have a lot of tolerance stack up including planarity of the array to the mounting datums as well as mirror tilt angle variation which can vary from part to part and vary across the array.  The mechanical ICD for this part will show the mechanical datums and contain the tolerances for the array planarity and location.
• What is the application?
• What is “Near field” location.  Is this an image of the DMD mirrors? 

If you are not comfortable sharing this information in the public forum, please send me a friend invite so we can connect via private messaging.

Fizix