Vista Module 39 Performance

This section provides sample data for delivered science grade Module 39. Data for Module 22 were reported in a previous paper [3] and data for Module 45 are reported in another paper in these proceedings [7]. As described above, this module received a single-layer AR coating with a minimum in reflectance at a wavelength of 1.4 microns. Figure 5 shows a map of QE in the J band for the entire 2048 x 2048 active array together with the associated QE histogram.

Figure 5. QE: J-Band Array-Mean = 76.0% with sigma/mean = 7.9%. Pixel operability is 99.74% (entire 2048 x 2048 array).

The mean QE in the J band is 76.0% with uniformity (sigma/mean) of 7.9%. QE operability for the entire 2048x2048 array in the J band is 99.74%. Figures 6 and 7 display similar data for the H and K bands. For the H band, the mean QE is 95.0% with uniformity (sigma/mean) of 6.5%. QE operability for the entire 2048x2048 array in the H band is 99.76%. For the K band, the mean QE is 98.0% with uniformity (sigma/mean) of 6.2%. QE operability for the entire 2048x2048 array in the H band is 99.84%.

Figure 8 shows dark current performance and Fig. 9 shows detector relative spectral response. Figure 10 displays an interferogram illustrating the flatness of the detector, which shows a peak-to-valley flatness of 3.1 ^m as measured over 20 points on the detector.

Figure 6. QE: H-Band Array-Mean = 95.0% with sigma/mean = 6.5%. Pixel operability is 99.76% (entire 2048x2048 array).

CöiuflW

Figure 6. QE: H-Band Array-Mean = 95.0% with sigma/mean = 6.5%. Pixel operability is 99.76% (entire 2048x2048 array).

Figure 7. QE: K-Band Array-Mean = 98.0% with sigma/mean = 6.2%. Pixel operability is 99.84% (entire 2042048 array).

Col Limn

Figure 8. Dark current: Array-Mean = 0.23 e-/sec with a pixel operability of 99.47% (entire 204x2048 array).

Col Limn

Figure 8. Dark current: Array-Mean = 0.23 e-/sec with a pixel operability of 99.47% (entire 204x2048 array).

Figure 9. Detector relative spectral response. The cutoff wavelength is 2.50 ^m (50% relative response per photon). The cuton wavelength of ~0.8 |im is determined by the CdZnTe substrate.

Measurement Parameters

fib:

4V)v*i*ng9i

m Z* nm

•Atdg*

lit

Iffli

r« i««

Hltl 112»

tifJl uir

Cob

ion» 900*

Tim*

«ta»

Analysis Results

Ra

575.700 nm

Rms

679.119 nm

20 Pt. PV

3132 urn

2 Pt. PV

3.35 urn

Analysis Parameters

T«IT I

Tin

Aipfl

Ml *

Ma Mi

Cube tor Mill

Flit» ring

Hon*

Dab R»ifcr»

Ho

wild Polnti

KS43(

10 2D 30 JO 90 00 70

Figure 10. SCA Flatness: 3.1 ^m Peak-to-Valley (20 points).

Was this article helpful?

0 0
Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

Get My Free Ebook


Post a comment