Knight
Optical (UK) Ltd
LONGPASS
EDGE FILTER RANGE
 Often
referred to as Longpass (LP) filters, they are very useful
for isolating regions of the spectrum. They are an excellent
choice as emission filters in fluorescence applications,
and as order sorting filters for photometry. They are also
very useful as stray light or trim filters, to eliminate
any unwanted near band radiation. Edge filters are very
common in Raman Spectroscopy and Astronomy. Raman Edge
Slopes supplied by Knight Optical are typically 1.2%, OD0.3
to OD5. Our Stock LP edge filters (not Raman) have 3% & 4%
slopes, OD0.3 to OD4. Laser blocking edge filters can be
designed to provide both deep blocking at the laser wavelength
and high transmission close to the laser line. All Knight
Optical LP filters are constructed of durable dielectric
coatings, and will withstand the normal cleaning and handling
associated with any high-quality optical component. Their
film construction is essentially a modified quarter-wave
stack, using interference effects rather than absorption
to isolate their spectral bands. Unlike filter glass, which
is not sensitive to wavelength shift with angle, these
filters will shift shorter in wavelength with an increase
in their angle of incidence. This feature can be useful
in applications where it may be desirable to fine tune
the 50% cut-on, or cut-off wavelength. Standard LP edge
filters are available in 10nm increments from 400nm to
700nm, and 50nm increments from 750nm-1550nm.
Knight
Optical can design edge filter spectral characteristics
to meet customer needs, including transmission level, transmission
range, blocking density, blocking range, spectral positioning
of half power wavelength, incident angle or range of angles
for use, and degree of steepness for edge filter slope.
Custom edge filters are available and will be quoted upon
request. Please contact Knight Optical for more specific
information.
| Transmission
(from cut-on): |
400-700nm:>=80%@pk;
750-1000nm>=75%@pk; >1000nm >=70%@pk |
| 50%
of peak cut-on tolerance: |
400-700nm:
+/-3nm; 750-1550nm: +/- 15nm |
| Rejection
Region 200nm to Cut-On: |
>=OD4,
OD6 average |
| Cut-On
Slopem |
3%,
OD0.3 to OD4 |
| Stock
size mm: |
12.5mm;
25.0mm; 50mm diameter |
| Other
available size mm: (Delvery within 1-2 weeks) |
12.7mm;
25.4mm; 50.8mm |
| Diameter & Aperture
(mm): |
12.5mm
(8.5mm aperture) 12.7mm (8.7mm aperture)
25.0mm
(21mm aperture) 25.4mm (21.4mm aperture)
50mm (46mm aperture)
50.8mm (46.8mm aperture) |
| Thickness
(mm): |
6.1mm
+0/-0.1mm |
| Optimum
Operating Temperature: |
23°C |
| Edge
treatment: |
Mounted
in black anodized aluminum ring |
| Edge
marking format: |
{Knight
Optical Part#} - {KOLTD} - arrow in direction of light
path |
| Surface/Coating
Quality: |
80/50
Per Mil-0-13830A |
| Usable
Temperature Limits: |
-50°C
to +80°C |
| Design
type: |
Multicavity |
| Assembly: |
All
filters are scribed and hermetically sealed to ensure
maximum longterm stability |
Knight
Optical (UK) Ltd has a solution for your light-filtering
applications
Whatever your requirement, however unusual we will fulfill
them to your complete satisfaction!
Buy
now from stock...
Knight
Optical (UK) Ltd
Unit 4, Roebuck Business Park, Harrietsham ,Kent, ME17 1AB. United Kingdom
Phone: +44 (0)1622 859444
e-mail: info@knightoptical.co.uk
Knight Optical (Europe) - A Division of Knight Optical (UK) Ltd
 +44 (0) 1622 850614
Send Enquiry to Bertrand
 +44 (0) 1622 851078
Send Equiry To Marco
 +44 (0) 1622 850429
Send Enquiry to Robert
|
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