While discussing the UV upturn problem Mark asked if I was making any assumptions about the magnitude of off array intensities. Short anwser is no. Got me to thinking that I don't have a webpage showing the off ccd laser data. So here it is.

This shows the laser data taken in the overlap region of the blue and read spectrograph (545-644 nm). Each laser line (blue (1:512) and red (513:1024) spec) are normalized by the in-band area of the laser peak on the blue spectrograph. So the decrease in the laser peak on the red side show the effect of the cut off filter I think?? Ie not red light is getting onto the blue side.

Figure 1

This shows the laser data taken in the overlap region of the blue and read spectrograph (545-644 nm). Each laser line (blue (1:512) and red (513:1024) spec) are normalized by the in-band area of the laser peak on the red spectrograph.

Figure 2

This shows the little bit of light from the red array onto the blue array.

Figure 3

This shows the laser data which is off the red end of the red spectrograph (955.8 nm). Because there is no laser peak I used the NRM x9 Vdc (Mike what are these??) values to normalize the data. I am showing the 940- 950 nm data also normalized to the NRM x9 Vdc values so you can see the scaling of light on and off the array.

Figure 4

To get an idea of the amount of light from off ccd which is getting on the array the area under the curves (laser data in figure 3) was calculated for the red spectrograph. The dashed red line below shows there the edge of the red spec is. Seems like there is a lot of light. This could affect the system response a lot! (PS I added the in-band area line for fun).

Figure 5

Same data as above but the total area graph has been shifted down (subtracting 233 - mean area of 1st four lasers) so it is "scaled" to the mean in-band area of the 4 lasers on the array but with also with NRM x9 Vdc values.

Figure 6