Bandpass Optical Filters DBT Series
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A bandpass filter is designed to pass a specified range of wavelengths with high transmittance while blocking all others.Bandpass filters are typically designated by the wavelength range they transmit, their passband.Aside from the passband wavelength, the three most important specifications of any bandpass filter are the center wavelength (CWL),the full width at half maximum (FWHM), and the peak transmission (T).The center wavelength (CWL) of a bandpass filter is the wavelength at the center of the passband.The peak transmission (T) is the wavelength of light at maximum transmission. Finally, the full width at half maximum (FWHM) is the bandwidth at 50% of the maximum transmission.Sometimes cut-on and cut-off wavelengths are used to describe the filter’s passband instead of FWHM and CWL. |
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Characteristics of Bandpass Optical Filters
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Serial number
|
Type
|
CWL(TM/λMnm) |
Shortwave cut-on (T/λnm)
|
Longwave cut-off
|
FWHM (λ2-λ1)(nm)
|
Thickness
|
|
1
|
DBT400
|
≥45/400±2
|
0/320±5
|
0/525±5
|
≤90
|
2
|
|
2
|
DBT435
|
≥48/435±2
|
0/340±5
|
≤2.0/540±5
|
≤100
|
4
|
|
3
|
DBT470
|
≥40/470±2
|
0/340±5
|
0/600±5
|
≤115
|
4
|
|
4
|
DBT500
|
≥48/500±2
|
0/380±5
|
0/630±5
|
≤100
|
4
|
|
5
|
DBT530
|
≥48/530±2
|
0/420±5
|
0/670±5
|
≤95
|
2
|
|
6
|
DBT545
|
≥48/545±2
|
0/400±5
|
0/720±5
|
≤100
|
4
|
|
7
|
DBT560
|
≥40/560±2
|
0/435±5
|
0/725±5
|
≤104
|
4
|
|
8
|
DBT600
|
≥36/600±2
|
0/470±5
|
≤1.0/800±5
|
≤95
|
4
|
|
9
|
DBT660
|
≥44/660±2
|
0/500±5
|
≤0/800±5
|
≤115
|
4
|
|
10
|
DBT700
|
≥28/700±2
|
≤0.5/570±5
|
≤0/820±5
|
≤95
|
4
|
|
11
|
DBT720
|
≥50/720±2
|
0/500±5
|
≤0/900±5
|
≤140
|
4
|
|
12
|
DBT740
|
≥25/740±2
|
0/650±5
|
≤0/900±5
|
≤85
|
4
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