Andover long wave pass filter

NegotiableUpdate on 01/05

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The characteristic of Andover long wave pass filters is their high conversion rate between the reflection and transmission regions. Such a high conversion rate makes it the preferred choice for emission filters in fluorescence applications and sorting filters in photometry.

Product Details

Andover long wave pass filterMain function introduction:

These sharp edge filters are commonly referred to as long wave pass (LWP) and short wave pass (SWP) filters,Andover long wave pass filterThe characteristic is their high conversion rate between the reflective and transmissive regions. Such a high conversion rate makes it the preferred choice for emission filters in fluorescence applications and sorting filters in photometry. They can also be used as stray light or fine tuned filters to eliminate any unwanted near-field radiation. All Andover LWP/SWP filters are composed of a hard and durable surface dielectric coating that can withstand routine cleaning and handling associated with any high-quality optical component. Their membrane structure is essentially a modified quarter wavelength stack that utilizes interference effects rather than absorption to isolate their spectral bands. Unlike filters, these filters are insensitive to changes in wavelength with angle, and their wavelengths become shorter as the incident angle increases. This feature is useful in applications that may require fine-tuning of the 50% cutoff wavelength or cutoff wavelength. All standard edge filters can increase from 400nm to 1000nm in increments of 50nm.

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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