Linear variable filters for NASA’s OVIRS instrument: pushing the envelope of blocking

Karen Hendrix

doi:10.1364/AO.56.00C201

Applied Optics
Vol. 56,
Issue 4,
pp. C201-C205
(2017)
•https://doi.org/10.1364/AO.56.00C201

Linear variable filters for NASA’s OVIRS instrument: pushing the envelope of blocking

Karen Hendrix

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Karen Hendrix, "Linear variable filters for NASA’s OVIRS instrument: pushing the envelope of blocking," Appl. Opt. 56, C201-C205 (2017)

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Abstract

The NASA OVIRS spectrometer provides high resolving power spectra over a broad wavelength region: 0.4–4.3 μm, in a compact assembly. Thick, complex blocker designs (up to 153 μm, 1839 layers) and precision manufacturing enable this performance.

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LVF #	Passband Range (μm) Start	Passband Range (μm) End	Target Resolving Power	Blocker Wavelength Range (μm)
LVF 1a	0.4	0.66	125	0.725–4.5
LVF 1b	0.66	1.09	125	0.3–0.62 and 1.15–4.5
2	1.09	1.8	150	0.3–0.93 and 2.0–4.5
3	1.8	2.97	200	0.3–1.64 and 3.4–4.5
4	2.9	4.3	300, goal 350	0.3–2.35

Stack #	Stack Center (μm)	Thickness of QW Stack; 22 Periods (μm)
1	4.40	28.8
2	3.67	24.0
3	3.07	20.1
4	2.56	16.8
5	2.14	14.0
6	1.78	11.7
7	1.49	9.7
8	1.24	8.1
9	1.04	6.8
10	0.87	5.7
11	0.72	4.7
Total	-	150.4

Stack #	Stack Center (μm)	Thickness of QW Stack; 22 Periods (μm)
1	4.40	28.8
2	3.67	24.0
3	3.07	20.1
4	2.56	16.8
5	2.14	14.0
6	1.78	11.7
7	1.49	9.7
8	1.24	8.1
Total	-	133.2

Order (down)/Stack (across) #	1	2	3	4	5	6	7	8	9	10	11
1	4.40	3.67	3.07	2.56	2.14	1.78	1.49	1.24	1.04	0.87	0.72
2	2.20	1.84	1.53	1.28	1.07	0.89	0.74	0.62	0.52	0.43	0.36
3	1.47	1.22	1.02	0.85	0.71	0.59	0.50	0.41	0.35	0.29
4	1.10	0.92	0.77	0.64	0.53	0.45	0.37	0.31
5	0.88	0.73	0.61	0.51	0.43	0.36
6	0.73	0.61	0.51	0.43	0.36
7	0.63	0.52	0.44	0.37
8	0.55	0.46	0.38
9	0.49	0.41	0.34
10	0.44	0.37
11	0.40
12	0.37
# of orders to suppress	5	4	4	3	2	2	1	2	1	1	0

Order (down)/ Stack (across) #	1	2	3	4	5	6	7	8
1	4.40	3.67	3.07	2.56	2.14	1.78	1.49	1.24
2	2.20	1.84	1.53	1.28	1.07	0.89	0.74	0.62
3	1.47	1.22	1.02	0.85	0.71	0.59	0.50	0.41
4	1.10	0.92	0.77	0.64	0.53	0.45	0.37	0.31
5	0.88	0.73	0.61	0.51	0.43	0.36
6	0.73	0.61	0.51	0.43	0.36
7	0.63	0.52	0.44	0.37
8	0.55	0.46	0.38
# of orders to suppress	4	3	3	2	2	1	1	0

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Equations (2)

Applied Optics