DLP5500: Contrast Ratio of this Product

Hello Ky,

Contrast ratio is very system dependent.  If you are using a fiber (with a GRIN lens)  then you should have decent extinction ratio (which is what I think you are asking about).  What extinction ratio would your application require?  

This would require some diffraction modeling at 795 nm and the GRIN lens or other fiber coupled optics information.

Fizix

we use aspheric mirrors instead of grin lens.

We put SPCM after the light path as a detector. So we need to ensure when we switch the tilt angle, the leakage should reach fW, with a uW input (about 60dB extinction rate). 

About the working wavelength, you mean the DMD may cause diffraction or changing of spatial pattern of the 795nm light?

Ok I find another product DLP4500NIR fits our requirement of working wavelength. So the only question is the extinction rate.

Ky,

Let me confer with one of my colleagues on this.  Depending on the pixel pitch of a given DMD certain wavelengths may not work will with a fiber setup, since typically only one order is useable.  With a SPCM, if you can collect multiple orders then it may work regardless.

Fizix

oh thanks! Please let me know if you have further result. Because the extinction rate is really important for us.

Ky,

I have had to dig up some of my older models and hope to run them tomorrow.  Sorry for the delay.

FIzix

It's ok, we are not in a hurry

Hello again Ky,

The good news is I found my models in my archived files.  I will try to run them in the next couple of days.

Fizix