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Optida Co. offers several kinds of filters. Bandpass interference filters are used for isolation of wavelength range. Narrowband filters have 10 nm or less, medium-band filters have about 40 nm, and wideband filters have about 80 nm FWHM.
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Photon etc. helps to break new frontiers by approaching an excitation wavelength to as close as 10 cm-1. The Top Notch Filter is by far the narrowest notch filter in the industry, ideal for high efficiency simultaneous collection of low wavenumber Stokes and anti-Stokes signals.
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For those seeking tunability, we offer our Tunable Top Notch Filter with performances similar to our fixed wavelength Top Notch Filter at any wavelength from 633 nm to 1.6 µm. Optimized for Resonant Raman Spectroscopy using Ti:Saph laser, it can be customized to any specific wavelength range, typically 300 nm wide.
The Tunable Top Notch Filter has a high throughput (up to 80%), with a selectivity similar to that of a triple spectrograph, but at a fraction of the price. Also, our Tunable Top Notch Filter is a compact, easy to align instrument with an intuitive user interface that allows efficient and precise control of the blocked wavelength.
This filter is perfectly matched to our Laser Line Tunable Filter for Raman applications. The Tunable Top Notch Filter's extremely narrow bandwidth rejection has a slightly bigger bandwidth than our Laser Line Tunable Filter to attenuate the excitation light in Resonant Raman Spectroscopy. The same user interface is used to simultaneously control both instruments through a single USB port.
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These filters are used to eliminate undesirable intensity variations in optical systems. The density of the filter increases in the radial direction from the outside edge towards the center. Bullseye Apodizing Filters are produced on a custom basis since uniformity variations are a function of the customers optical configurations. The filter can also be supplied as an inverse apodizing configuration. That is, the density increases from the center to the outside edge.
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SCHOTT supplies standard and custom-made interference filters within the spectral range from 200 nm to 2000 nm. Development and production according to customers’ specifications comprise the greatest part of our business. We use the high vacuum evaporation process (PVD) to coat substrates. Ion assisted deposition processes, such as the reactive ion plating process, lead to very hard and compact thin films. As a consequence, these interference filters exhibit excellent climatic resistance and have very stable spectral characteristics with respect to temperature and humidity changes.
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Absorption filters may be neutral or spectrally selective. While spectral characteristics are customarily shown for a 1 mm thickness, the filters themselves are usually made thicker to minimize transmission differences caused by small variations in thickness occurring in manufacture.
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IR Cutoff Filters and Optical Low Pass Filter for use with CMOS/CCD Sensors. These filters can be modified to meet your specifications.
Infrared (IR) cut-off filters are used with color CCD or CMOS imagers to produce true color images. An IR cut-off filter blocks the transmission of the infrared while passing the visible. This can be done with two optical techniques: absorption or reflection. Absorptive filters are made with special optical glass that absorbs near infrared radiation. Reflection type filters are essentially short-pass interference filters that reflect infrared light with high efficiency. We offer two types of absorptive filters: IRC20 and IRC21. The standard reflection type (IRC30) filter offers cut-off wavelength at 640nm (+/-10nm). Other cut-off wavelength can be selected for custom orders. IRC20 type is recommended for CCD imagers while IRC21 and IRC30 are more suited for CMOS imagers. The standard sizes are listed below. Other sizes can be custom ordered.
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* Bullseye Apodizing Filters
* Color Separation Filters
* Heat Absorbing Filters
* Linear Variable Spectral Filters
* Longwave Pass Filters: Infrared
* Longwave Pass Filters: Visible
* Plateau Filters
* Ramp Filters
* Schott Glass Absorbing Nd Filters
* Schott Glass Colored Filters
* Shortwave Pass Filters: Infrared
* Shortwave Pass Filters: Visible
* Step Circular Neutral Density Filters
* Step Linear Neutral Density Filters
* Transparent Conductive Filters
* Wavelength Division Multiplex Filters (wdm)
* Wide Bandpass Filters: Infrared
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Astrodon® tru-balance filters are the first filters designed to match the sensitivity of modern CCD cameras. Using filters matched with the detectors greatly simplifies all aspects of deep-sky tri-color imaging. Benefits include shorter imaging times, G2V white point balance, balanced OIII nebula color, and pre-balanced RGB channels when using Kodak Blue Plus CCDs.
They are an outgrowth of over a year and a half of research, published in Sky and Telescope and presented at AstroImage and Imaging the Sky conferences. The narrowband filters, H a, SII and OIII, allow you to image when the moon is up, thereby extending the amount of imaging time you have each month. Since they are parfocal with the LRGB filters, you can easily focus on the L or C filter and then switch to the narrowband filter WITHOUT refocusing.
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Made with non-hydroscopic materials, these filters have much improved longevity in harsh environments compared to standard "off the shelf" soft hydroscopic film filters, which begin to degrade after as little as one year. Our Interference Filters have an anticipated working life of five years.
The center wavelength of the filter will shift toward shorter (blue) wavelengths as the angle of incidence increases; the greater the angle the greater the shift. This is known as blue shifting.
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Bandpass filters are optical elements that are designed to transmit a specific spectral band with high efficiency, while reject others. The characteristics of the bandpass are controlled by multilayer dielectric coatings
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Filters
Filters are used in a variety of applications where absorption, wavelength control or transmission requirements are critical. MediVision offers a complete production capability of many different types of filters. Custom shapes and assemblies are available.
Specifications Types:
Color Glass, Conversion, Custom combining, Dichroic, Heat Absorbing, Hot and Cold Mirrors, Interference, Narrow Band Pass
Coating Range : 300nm - 1600nm
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Spectrogon designs and manufactures optical interference filters employing state of the art deposition technology and the most advanced design criteria available.
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The motorized Filter Wheel 40 permits automatical changing of 4 or 6 filters. Unmounted filters ø 25 mm/1", or optics in ø 25 mm mounts can be used.
The FRM 40 filter wheel can be mounted on a SYS 40 slide. Using adapter plate ADP-S65-S40-20 it can be fitted to a SYS 65 slide.
In terms of drive, a 2-phase step motor as well as a DC servo motor version is available. As a standard, a contactless Hall-effect limit switch is integrated.
Holders are not scope of delivery.
All aluminium parts have a top quality black anodised protective coating.
- compatible with SYS 40 and with SYS 65
- deformation-resistant aluminium, black anodized
- mountable on slide
- with step motor or geared DC servo motor
- contactless, high-precision Hall-effect limit switches
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Apogee AI-FW50 Series Filter Wheels for Alta and Ascent Models
The AI-FW50 series of filter wheels provide large format filtering solutions for the Alta and Ascent series of imaging systems. The FW50 filter wheel currently has two interchangeable filter carousels; A large 7 position 50mm square wheel ideal for the U9000 and U16 imaging systems, and a 9 position 50mm round wheel ideal for any other Alta or Ascent system.
The filter wheel is controlled via USB 2.0. The filter wheel easily adapts to the Alta D2, D7, and D9 bodies, as well as to AP systems.
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