Band-pass Filter Glass
Author：JINGSHENG OPTICAL Date：2016-03-19-
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This kind of glass only transmits the light within a narrow wavelength range as shown in figure. Its spectral characteristic is composed of maximum transmissivity (TM) wavelength of the peak (lM), front-cut-off wavelength, behind-cut-off wavelength, and half-peak width.
The wavelength corresponding to the half of the maximum transmissivity are l2 and l1. And the half-peak width is determined by l2 - l1. Front (behind)-cut-off wavelength is corresponding to the wavelength of "zero" transmissivity. But there are a few types which transmissivities of the behind-cut-off wavelengthes can't approach to zero, then they are determined by the transmissivity of the certain wavelength.
Band-pass filter glass is named DTB, and wavelength of the peak is used as its serial number.
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Technical Indexes
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No.
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Type
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Maximum Transmissivity
(TM/λMnm)
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Front Cut-off
(T/λnm)
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Behind Cut-off
(T/λnm)
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Half-peak Width
(λ2-λ1)(nm)
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Thickness (nm)
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1
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DBT400
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≥45/400±2
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0/320±5
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0/525±5
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≤90
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2
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2
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DBT435
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≥48/435±2
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0/340±5
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≤2.0/540±5
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≤100
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4
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3
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DBT470
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≥40/470±2
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0/340±5
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0/600±5
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≤115
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4
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4
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DBT500
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≥48/500±2
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0/380±5
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0/630±5
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≤100
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4
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5
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DBT530
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≥48/530±2
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0/420±5
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0/670±5
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≤95
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2
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6
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DBT545
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≥48/545±2
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0/400±5
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0/720±5
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≤100
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4
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7
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DBT560
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≥40/560±2
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0/435±5
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0/725±5
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≤104
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4
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8
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DBT600
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≥36/600±2
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0/470±5
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≤1.0/800±5
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≤95
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4
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9
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DBT660
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≥44/660±2
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0/500±5
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≤0/800±5
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≤115
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4
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10
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DBT700
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≥28/700±2
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≤0.5/570±5
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≤0/820±5
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≤95
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4
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11
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DBT720
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≥50/720±2
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0/500±5
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≤0/900±5
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≤140
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4
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12
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DBT740
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≥25/740±2
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0/650±5
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≤0/900±5
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≤85
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4
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