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Andover長波通濾光片主要功能介紹：
這些尖銳邊緣濾波器通常被稱為長波通（LWP）和短波通（SWP）濾光片，Andover長波通濾光片特征在于它們在反射和透射區(qū)域之間的高轉(zhuǎn)換率。如此高的轉(zhuǎn)換率使其成為熒光應(yīng)用中的發(fā)射濾光片以及光度法中的排序濾光片的**選擇。它們還可以用作雜散光或微調(diào)濾光片，以消除任何不需要的近帶輻射。所有Andover LWP / SWP濾光片均由堅硬，耐用的**表面介電涂層構(gòu)成，可承受與任何高質(zhì)量光學(xué)組件相關(guān)的常規(guī)清潔和處理。它們的膜結(jié)構(gòu)本質(zhì)上是經(jīng)過修改的四分之一波長疊堆，利用干涉效應(yīng)而不是吸收來隔離其光譜帶。與濾鏡不同 由于對波長隨角度的變化不敏感，這些濾光器的波長隨入射角的增加而變短。此功能在可能需要微調(diào)50％截止波長或截止波長的應(yīng)用中很有用。所有標(biāo)準(zhǔn)邊緣濾光片都可以從400nm到1000nm以50nm的增量遞增。
Low-cost
Wide slection of wavelengths
Provide steeper transistion than color glass filters
General Specifications
| Thickness: | 4.0mm maximum |
| Size Tolerance: | +0.0mm/-0.5mm |
| Min. Clear Aperture: | 85% of outside dimension |
| Substrate Material: | Glass (Note: BK-7 or Borofloat available as an option for higher Tx.) |
| Flatness: | 3-5 waves per 25 TWF |
| Surface Quality: | 80-50 per MIL-C-48497A |
| Humidity and Abrasion: | Per MIL-C-67** |
| Operating Temperature: | -50°C to +200°C |
| Cut-on Slope: | 6% maximum (11% for 300nm filter) |
| Cut-on Tolerance: | ±10nm from 400nm-1100nm ±5nm from 300nm - 375nm |
| Mechanical: | Unmounted |
Transmission
| Long Wave Pass: | 85% average from the 50% cut-on point to 2000nm |
| Short Wave Pass: | 400-450nm: 85% avererage from the 50% cut-on point to 0.75 x the 50% cut-off point 500-1000nm: 85% avererage from the 50% cut-on point to 0.75 x the 50% cut-off point Note: with the exception of the 400nm filter, all SWP filters will drop off in transmission at wavelengths under 400nm.) |
Rejection
| Long Wave Pass: | 99% or greater from 0.9 x the 50% point to the UV |
| Short Wave Pass: | 99% or greater from 1.07 x the 50% point to 1.25 x the 50% point |
| Effective index of refraction (n*) | 1.7 (approximately) |
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