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Removable Filter Holders and Inserts for 30 mm Cage System![]()
Stackable Design CFH2 (Cage Plate & Filter Holder Included) CFH1 (Cage Plate & Filter Holder Included) CFH1-F Extra Ø1/2" Filter Holder CFH2-V Variable Attenuator Insert ![]() Please Wait
Features
The CFH1 and CFH2 Removable Filter Holders are based upon a precision dovetail design, ensuring good position stability and repeatability. The CFH1 features an SM05-threaded (0.535"-40) bore that accepts Ø1/2" optics up to 0.18" (5.0 mm) thick, while the CFH2(/M) has an SM1-threaded (1.035"-40) bore that can accommodate Ø1" optics up to 0.31" (8.0 mm) thick. These mounts are designed for use with a wide variety of Thorlabs' optics such as our Dichroic or Neutral Density Filters, Economy or Concave Mirrors, or Frosted Glass alignment disks. The optic is secured in the mount using the included retaining ring. Extra filter plates are available separately for both the CFH1 Ø1/2" filter mount and the CFH2 Ø1" filter mount. In addition, blank plates for each mount, also purchased separately, can be used as a manual shutter or machined to suit your specific requirements. The CFH2-V Variable Attenuator Insert can be used in the CFH2 to partially or completely block light from passing through the aperture. Cage System OverviewThe Cage Assembly System provides a convenient way to construct large optomechanical systems with an established line of precision-machined building blocks designed for high flexibility and accurate alignment. 16 mm, 30 mm, and 60 mm Cage System StandardsThorlabs offers three standards defined by the center-to-center spacing of the cage assembly rods (see image below). The 16 mm cage, 30 mm cage, and 60 mm cage standards are designed to accomodate Ø1/2", Ø1", and Ø2" optics, respectively. Specialized cage plates that allow smaller optics to be directly inserted into our larger cage systems are also available. Standard ThreadsThe flexibility of our Cage Assembly System stems from well-defined mounting and thread standards designed to directly interface with a wide range of specialized products. The three most prevalent thread standards are our SM05 Series (0.535"-40 thread), SM1 Series (1.035"-40 thread), and SM2 Series (2.035"-40 thread), all of which were defined to house the industry's most common optic sizes. Essential building blocks, such as our popular lens tubes, directly interface to these standards. ![]() An example of the standard cage plate measurements determining cage system compatibility.
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The CFH1 Removable Filter Holder is based upon a precision spring-loaded dovetail design, ensuring good position stability and repeatability. The SM05 (0.535"-40) threaded bore accepts Ø1/2" optics up to 0.18" (5.0 mm) thick, fastened with our SM05RR Retaining Ring. Extra SM05-threaded filter plates (CFH1-F) are available separately. In addition, the CFH1-B Blank Plate, also purchased separately, can be used as a manual shutter or machined to suit your specific requirements. ![]() ![]() Click to Enlarge Pushing the adjuster down on the CFH2-V quickly closes the shutter. ![]() Click to Enlarge CFH2 Schematic
The CFH2(/M) Removable Filter Holder is a light-tight, stackable filter block designed to integrate easily into our 30 mm cage system or to be post mounted on a breadboard. Unlike the CFH1(/M) above, this light-tight design is achieved with a permanent O-ring mounted on the front face and a double-flanged top plate on the removable inner body. Filter Holder The top plate features two laser-engraved boxes for labeling and identification of the mounted optic. Multiple filter holders can be continually stacked in our 30 mm cage system provided an equivalent length of cage rods is available for support. The cage rods can pass through the cage rod clearance holes on the bottom of the CFH2; however, they thread into the top. Extra SM1-threaded filter plates (CFH2-F) are available separately. Blank Plate Variable Attenuator Insert | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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