Longpass Filters
Longpass filters are commonly used to isolate regions of a broad spectrum. The role of this type of filter is to transmit energy over a specified band at wavelengths longer than the cut-on wavelength, and to block the transmittance of energy at wavelengths shorter than the cut-on wavelength. In addition, longpass filters are useful for custom bandpass filtering by using with shortpass filters. Asahi Spectra offers a wide variety of longpass filters in the broad wavelength range: ultraviolet, visible, or infrared wavelengths.
| Description | Cut-on (nm) | Thickness (mm) | Item# | |
|---|---|---|---|---|
| 25mm dia. | 50x50mm | |||
| Longpass Filter / UV 250nm | 250 | 1 | XUL0250 | ZUL0250 |
| Longpass Filter / UV 275nm | 275 | 1 | XUL0275 | ZUL0275 |
| Longpass Filter / UV 300nm | 300 | 1 | XUL0300 | ZUL0300 |
| Longpass Filter / UV 325nm | 325 | 1 | XUL0325 | ZUL0325 |
| Longpass Filter / UV 350nm | 350 | 1 | XUL0350 | ZUL0350 |
| Longpass Filter / UV 385nm | 385 | 1 | XUL0385 | ZUL0385 |
| Longpass Filter / UV 400nm | 400 | 1 | XUL0400 | ZUL0400 |
| Longpass Filter / UV 422nm | 422 | 1 | XUL0422 | ZUL0422 |
| Longpass Filter / VIS 430nm | 430 | 1 | XVL0430 | ZVL0430 |
| Longpass Filter / VIS 450nm | 450 | 1 | XVL0450 | ZVL0450 |
| Longpass Filter / VIS 470nm | 470 | 1 | XVL0470 | ZVL0470 |
| Longpass Filter / VIS 490nm | 490 | 1 | XVL0490 | ZVL0490 |
| Longpass Filter / VIS 510nm | 510 | 1 | XVL0510 | ZVL0510 |
| Longpass Filter / VIS 530nm | 530 | 1 | XVL0530 | ZVL0530 |
| Longpass Filter / VIS 550nm | 550 | 1 | XVL0550 | ZVL0550 |
| Longpass Filter / VIS 570nm | 570 | 1 | XVL0570 | ZVL0570 |
| Longpass Filter / VIS 590nm | 590 | 1 | XVL0590 | ZVL0590 |
| Longpass Filter / VIS 610nm | 610 | 1 | XVL0610 | ZVL0610 |
| Longpass Filter / VIS 630nm | 630 | 1 | XVL0630 | ZVL0630 |
| Longpass Filter / VIS 650nm | 650 | 1 | XVL0650 | ZVL0650 |
| Longpass Filter / VIS 670nm | 670 | 1 | XVL0670 | ZVL0670 |
| Longpass Filter / VIS 690nm | 690 | 1 | XVL0690 | ZVL0690 |
| Longpass Filter / VIS 710nm | 710 | 1 | XVL0710 | ZVL0710 |
| Longpass Filter / VIS 730nm | 730 | 1 | XVL0730 | ZVL0730 |
| Longpass Filter / IR 750nm | 750 | 2 | XIL0750 | ZIL0750 |
| Longpass Filter / IR 780nm | 780 | 2 | XIL0780 | ZIL0780 |
| Longpass Filter / IR 810nm | 810 | 2 | XIL0810 | ZIL0810 |
| Longpass Filter / IR 840nm | 840 | 2 | XIL0840 | ZIL0840 |
| Longpass Filter / IR 870nm | 870 | 2 | XIL0870 | ZIL0870 |
| Longpass Filter / IR 900nm | 900 | 2 | XIL0900 | ZIL0900 |
| Longpass Filter / IR 930nm | 930 | 2 | XIL0930 | ZIL0930 |
| Longpass Filter / IR 960nm | 960 | 2 | XIL0960 | ZIL0960 |
| Longpass Filter / IR 990nm | 990 | 2 | XIL0990 | ZIL0990 |