Scan Line Filters for Optical Spectral Analysis

Bill R. Baker

doi:10.1364/AO.14.000353

Applied Optics
Vol. 14,
Issue 2,
pp. 353-362
(1975)
•https://doi.org/10.1364/AO.14.000353

Scan Line Filters for Optical Spectral Analysis

Bill R. Baker

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Bill R. Baker, "Scan Line Filters for Optical Spectral Analysis," Appl. Opt. 14, 353-362 (1975)

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Abstract

A class of filters is studied for applications in optical spectrum analyzers. The output device of the analyzer is a masked vidicon. Consequently the design criteria differ from those for filters commonly used in digital data processing, radar antenna shading, and conventional apodization. It is shown that crosstalk or interlocus interference can be reduced for practical geometries to a level about 20–30 dB lower than that of an unshaded aperture.

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SHADING, AMPLITUDE TRANSMITTANCE h(x), \|x\| ≤ 1/2	HALF POWER POINT OF MAIN LOBE				MAXIMUM LEAKAGE
	(f @ − 3 dB)				AT AN EVEN INTEGER
	SLOT 0.0	SLOT 0.2	SLOT 0.4	SLOT 0.6	SLOT 0.0	SLOT 0.2	SLOT 0.4	SLOT 0.6
exp (−px²)
p = 0	.44	.45	.46	.48	−00	−30.8	−24.8	−21.4
Rect (x)
p = .421	.45	.45	.47	.49	−45.9	−31.1	−25.3	−21.9
h_MIN = .900
p = .893	.46	.46	.47	.49	−40.0	−31.2	−25.7	−22.4
h_MIN = .800
p = 4.0	.51	.51	.53	.55	−31.7	−30.5	−28.2	−26.2
h_MIN = e⁻¹ = .368
1 − (1 − h_o) 2 \|x\|
h_o = 0	.64	.64	.65	.67	−00	−59.0	−46.8	−39.5
BARTLETT
h_o = .143	.57	.57	.58	.60	−00	−42.9	−37.2	−34. 1
h_o = .25	.54	.54	.55	.57	−00	−33.0	−33.0	−34.1
h_o + (1−h_o) cos 2 π x
h_o = .5	.72	.72	.73	.75	−00	−40.2	−33.8	−29.6
HANN
h_o = .54	.65	.65	.66	.68	−00	−47.7	−40.5	−35.5
HAMMING
h_o = .571	.61	.62	.63	.64	−00	−50.9	−45.0	−41.8
MARKEVITCH
h_o = .60	.58	.59	.60	.62	−00	−47.7	−41.8	−38.6

Abstract

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Equations (25)

Applied Optics