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簡要描述:Andover長波通濾光片特征在于它們在反射和透射區(qū)域之間的高轉換率。如此高的轉換率使其成為熒光應用中的發(fā)射濾光片以及光度法中的排序濾光片的**選擇。
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詳細介紹
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)域之間的高轉換率。如此高的轉換率使其成為熒光應用中的發(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**表面介電涂層構成,可承受與任何高質量光學組件相關的常規(guī)清潔和處理。它們的膜結構本質上是經(jīng)過修改的四分之一波長疊堆,利用干涉效應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用中很有用。所有標準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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