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Filter Holders for Plate Optics


  • Securely Holds Filters, Test Targets, or Beam Targets
  • Nylon-Coated Spring Clips or Nylon-Tipped Setscrews Prevent Damage to Optics

DH1

Compact Dual Filter Holder

FH2D

Stackable Dual Filter Holder

SFH2

Quick-Release Filter Mount

SFH3

Stackable 2” Filter Holder

FFM1

Dichroic Filter Mount

Application Idea

XYFM1 Translating Filter Mount Holding an NDL-10S-4 Step Variable ND Filter

Related Items


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Filter Mount
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550 nm Colored Glass Filter Held with a SFH3 Fixed Filter Mount

Features

  • Filter Mounts Securely Hold a Variety of Plate Optics
  • Support Filter Thicknesses up to 0.58" (14.7 mm)
  • Various Options Available; See Table Below for Details
Filter Mount
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VRC2 Detector Card Mounted Using an FH2 Filter Mount

Thorlabs offers a wide variety of filter mounts that are ideal for securely mounting an optic up to 0.58" (14.7 mm) thick in an optomechanical assembly. They are ideal for mounting ND filters or colored glass filters. These mounts can also hold temporary beam blocks, beam targets, or laser viewing cards, as shown in the image to the left. All filter holders, with exception of the PC2(/M) Flexure Plate Clamp and the FFM1 Dichroic Mount, include an 8-32 (M4) tap or #8 (M4) counterbore for mounting to a Ø1/2" post. They are rugged and solid, enabling permanent use within an assembly.

A variety of filter mount options are available, and can be quickly chosen using the table below. Several mounts feature a stackable design that allows multiple filter mounts to be attached together using two 8-32 cap screws of the appropriate length and two nuts. The quick-release mount is ideal for frequently switching between filters with easy access. Our compact filter holders are recommended for any application with tight space constraints. For rigid cage system assemblies, we offer a 60 mm cage compatible filter mount that can hold two 2" (50 mm) square filters simultaneously. Finally, two plate holders are offered that can hold plates as thick as 0.58" (14.7 mm) and are ideal for large exposure plates or filters.

Thorlabs also offers the XYFM1(/M) Test Target Positioning Mount which is designed to mount test targets or other rectangular optics up to 1" (25.4 mm) to 3" (76.2 mm) wide. It allows for the translation of any rectangular optic over a 50 mm x 30 mm (1.97" x 1.18") area.

Item # DH1(/M) PC2(/M) FH2 / FH2D SFH3 LCP05(/M) SFH2 FFM1 / LFFM1 FP01 / FP02 XYFM1(/M)
Filter Thickness ≤0.08" (2.0 mm)
One Optic

≤0.06" (1.5 mm)
Two Optics
0.03" - 0.09"
(0.8 - 2.3 mm)
≤0.08" (2.0 mm)
One Optic

≤0.06" (1.5 mm)
Two Optics (FH2D Only)
0.04" - 0.19"
(1 - 5 mm)
≤0.16"
(4 mm)
≤0.16"
(4 mm)
≤0.12" (3.0 mm)
for FFM1

≤0.16" (4.0 mm)
for LFM1
≤0.58"
(14.7 mm)
≤0.12"
(3 mm)
Feature Compact Compact Stackable Stackable Cage Compatible Quick-Release Cage Cube
Compatible
Thick Plate Translating

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Posted Comments:
Poster:andrey.kuznetsov
Posted Date:2016-08-04 14:00:52.497
What is the thinnest the clamp can be closed to repeatedly without damage? It can hold up to 2.3mm, but what about the minimum, since it's made from aluminium, seems like it's not going to be very flexible to hold thin objects.
Poster:ilyabaskin
Posted Date:2014-02-07 00:05:00.2
Dear Thorlabs , How would you recommend to stack the SFH3 filter mounts ?
Poster:jlow
Posted Date:2014-02-07 04:20:23.0
Response from Jeremy at Thorlabs: You can stack multiple SFH3 together by using the two #8 holes near the bottom of the mount. Put two #8-32 cap screws with appropriate length through the bottom two holes, stack the number of filter mounts you want, and then put two nuts on the other end.

Compact Filter Mount

Filter Holder
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DH1 Holding a VRC5 IR Viewing Card
Filter Mount
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DH1 Mechanical Drawing
  • Compact Size: 0.31" x 0.5" x 1.2" (8 mm x 12.7 mm x 30 mm)
  • Holds Two Thin Cards or Filters Simultaneously
  • Maximum Filter Thickness: 0.06" (1.5 mm) with Two Optics, 0.08" (2.0 mm) with One Optic
  • Mounts Directly to Ø1/2" Post via an 8-32 (M4) Tapped Hole

This compact filter mount can hold two viewing cards or filters up to 0.06" (1.5 mm) thick simultaneously. It holds a single filter or viewing card, as shown in the image to the right, up to 0.08" (2.0 mm) thick. The soft, nylon-coated spring clips provide a secure holding force without damaging the filter. Its small size and thin profile allow this mount to be positioned within space-constrained optical setups; see the mechanical drawing to the right for more size specifications.

The DH1 provides an 8-32 (M4) tapped hole in its base for mounting directly to our Ø1/2" posts.

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DH1 Support Documentation
DH1Compact Dual Filter Holder, 8-32 Tap
$15.00
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DH1/M Support Documentation
DH1/MCompact Dual Filter Holder, M4 Tap
$15.00
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Compact Flexure Plate Clamp

Filter Clamp
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The PC2(/M) can be mounted horizontally with the use of an RA90 angle clamp.
Filter Clamp Drawing
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PC2 Mechanical Drawing
  • Holds Optics between 0.8 mm and 2.3 mm Thick
  • Thumbscrew-Actuated Flexure Design for Clamping Plate
  • Compact Design Mounts Directly on a Ø1/2" Post

This Flexure Plate Clamp is a simple, compact mount for a plate or other thin object. The clamp can hold components between 0.8 mm and 2.3 mm thick and can be tightened using the thumbscrew on the side. The clamping screw can also be tightened using a 9/64" hex key (3 mm hex on metric version). While the plate clamp is compatible with a number of optics including colored glass filters, neutral density filters, and test targets, please use extreme caution when mounting optics in the clamp, as the clamp is made from aluminum and overtightening can cause damage to the optic.

The clamp has a diameter of 0.50" at its base and a 1/4"-20 (M6) tapped hole on the bottom. See the mechanical drawing to the right for more size specifications. The clamp can fit directly into a Ø1/2" post holder or angle clamp for Ø1/2" posts, as shown in the image to the far right. The clamp can also fit directly onto the 1/4"-20 (M6) end of a Ø1/2" post, using a setscrew at least 1/2" (12 mm) long to attach the clamp and the post. The clamp has a Ø0.24" through hole that allows an ER rod to pass through. The ER rod can be used for fine alignment of the clamp's orientation.

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PC2 Support Documentation
PC2Customer Inspired!Compact Flexure Plate Clamp, 1/4"-20 Tap
$20.40
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PC2/M Support Documentation
PC2/MCustomer Inspired!Compact Flexure Plate Clamp, M6 Tap
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Filter Mount, Stackable

Filter Mount
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These filter mounts can be stacked together using two 8-32 cap screws of the correct length and two nuts, such as those in our HW-KIT1 Hardware Kit.
dimensions
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FH2 Mechanical Drawing
  • Maximum Filter Thickness:
    • FH2: 0.08" (2.0 mm)
    • FH2D: 0.06" (1.5 mm) with Two Optics, 0.08" (2.0 mm) with One Optic
  • FH2D Can Mount Two Filters Simultaneously
  • Mounts Directly to Ø1/2" post via a #8 (M4) Counterbored Hole
  • Stack Filter Holders Using the Two #8 (M4) Through Holes to Accommodate Multiple Filters

The FH2 and FHD2 Filter Mounts are ideal for firmly holding one or two optics, respectively. Each clip is nylon coated to help prevent damage to the optic being held. Each mount can hold any rectangular optic wider than 1.36" and of various thicknesses. The FH2 can hold optics up to 0.08" (2 mm) thick, while the FH2D can hold one filter up to 0.08" (2 mm) thick and two filters up to 0.06" (1.5 mm) thick. They are compatible with a number of rectangular optics including colored glass filters, neutral density filters (with thicknesses of 2 mm or less), dichroic mirrors/beamsplitters, fluorescent imaging filters, holography plates, and test targets.

Each mount provides a center-located counterbored hole for Ø1/2" post mounting with the included 8-32 (M4) cap screw. This allows mounting to both imperial and metric posts. Additionally, they both offer two through holes for use with #8 (M4) screws, allowing multiple mounts to be stacked together as shown in the photo to the right. They are ideal for use in OEM applications requiring fastening to a secure bulkhead.

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FH2 Support Documentation
FH2Filter Holder, Stackable
$19.30
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FH2D Support Documentation
FH2DDual Filter Holder, Stackable
$28.00
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Filter Mount for 2" (50.8 mm) Square Optics, Stackable

dimensions
Click to Enlarge

SFH3 Mechanical Drawing
  • Designed for 2" Square Filters
  • Compatible with Filters Larger than a 2" Square
  • Filter Thickness Range: 1 mm (0.04") to 5 mm (0.19")
  • Mounts Directly to Ø1/2" post via a #8 (M4) Counterbored Hole
  • Stack Filter Holders Using the Two #8 (M4) Through Holes to Accommodate Multiple Filters

The SFH3 Filter Mount is ideal for securely holding 2" square filters. The long support arms add stability to the filter and are nylon coated to prevent damage to the optic. The arms are spaced to hold any square optic wider than 2" (50.8 mm) with a thickness up to 0.19" (5 mm). These mounts are compatible with a number of square optics including, colored glass filters, neutral density filters (with thicknesses 2 mm or less), and test targets.

The mount has a center-located counterbored hole for Ø1/2" post mounting with the included 8-32 (M4) cap screw. This allows mounting to both imperial and metric posts. Additionally, it contains two through holes for use with #8 (M4) screws, allowing multiple mounts to be stacked together.

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SFH3 Support Documentation
SFH3Fixed Filter Holder for 2” Square Filters, Stackable
$62.25
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Filter Mount for 2" (50.8 mm) Square Optics, Cage Compatible

  • Holds 2" (50.8 mm) Square Filters Up to 0.16" (4 mm) Thick
  • Mounts Up to 2 Filters Simultaneously
  • Four Ø6 mm Through Holes for 60 mm Cage Compatibility
  • Spring-Loaded Clips Hold Optic in Place and Enable Quick Removal
  • Mounts Directly to Ø1/2" Posts via an 8-32 (M4) Tapped Hole

This 60 mm Cage Plate, which has a Ø2" (Ø50.8 mm) through hole (Ø1.65" [Ø42 mm] clear aperture), is designed to hold either 2" square or 50 mm square filters up to 4 mm thick. Since the mount is equipped with two spring clips on each side, a filter can be pressed up against either side of the clear aperture. Additional features include four through holes for cage rods as well as side-located locking setscrews to hold the rods in position. For added convenience, the mount is post-mountable via the #8-32 (M4) tapped hole on the bottom surface.

This filter holder is ideal for use with our 2" x 2" Unmounted Absorptive Neutral Density Filters, Square Colored Glass Filters or our 2" square test targets.

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LCP05 Support Documentation
LCP0560 mm Cage-Compatible Mount for 2" Square Filters Up to 4 mm Thick, 8-32 Tap
$86.75
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LCP05/M Support Documentation
LCP05/M60 mm Cage-Compatible Mount for 50 mm Square Filters Up to 4 mm Thick , M4 Tap
$86.75
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Quick-Release Filter Mount for Rectangular Optics

Filter Holder
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SFH2 Holding a 0.09" (2.3 mm) Thick Neutral Density Filter
Optic Mount
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SFH2 Mechanical Drawing
  • Maximum Filter Thickness: 0.16" (4 mm)
  • Mounts Directly to Ø1/2" Posts via a #8 (M4) Counterbored Hole
  • Quick-Release Clips Have a Locking Setscrew for Added Long-Term Stability

The SFH2 Lockable Quick-Release Filter Holder is an ideal solution for applications that frequently need filters switched. Each arm has a 2-56 screw-actuated lock to adjust the holding force applied to the optic. These locking setscrews can be adjusted using the provided 0.035" hex key. This locking feature provides the long-term stability required for sensitive optical applications.

Both locking arms integrate rubber cushions that protect any mounted filters from damage, and can hold optics up to 0.16" (4 mm) thick. The design eliminates vertical stanchions associated with typical square filter mounts, such as those shown above, in order to provide maximum clear aperture. The mount has a center-located counterbored hole for Ø1/2" post mounting with the included 8-32 (M4) cap screw.

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SFH2 Support Documentation
SFH2Quick-Release Rectangular Filter Holder
$66.50
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Cage-Compatible Rectangular Filter Mounts

R2L2S3P3 Application
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An R2L2S3P3 Target Post Mounted via an FFM1 Filter Mount and a B3C Cube Base for Use in a Custom Imaging System
CM1-CC Application
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FFM1 Dichroic Filter Mount Holding a Dichroic Filter and mounted to a B3C Cube Platform mounted in a C6W Cube.
Item # FFM1 LFFM1
Optic Length Accommodated 26 - 43 mm (in C4W or C6W)
≥26 mm Post Mounted
30 - 53 mm in LC6W
≥30 mm Post Mounted
Optic Height Accommodated ≤1.26" (≤32 mm) in C4W
≤0.98" (≤25 mm) in C6W
≤2.5" (≤63.5 mm) in LC6W
Optic Thickness Accommodated 0.12" (3.0 mm) 0.16" (4.0 mm)
Post Mounting Two #4 Counterboresa #8 (M4) Counterbore
Cage-Compatible Mounting Platforms B3C(/M) or B4C(/M) LB3C(/M) or LB4C(/M)
  • An MSA8 or MSA4/M adapter is needed to mount the FFM1 to a Ø1/2" post.
  • Holds Rectangular or Square Filters up to 0.12" (3.0 mm) or 0.16" (4.0 mm) Thick
  • Two Spring-Loaded Clamping Mechanisms Secure Optic's Position
  • Can Mount Filters in a Post-Mounted or Cage Cube Configuration (See Table Below)

The FFM1 and LFFM1 Cage-Compatible Filter Holders are specifically designed to hold rectangular or square optics, such as dichroic filters, colored filters, beamsplitters, or ND filters.

Filters up to 0.12" (3.0 mm) or 0.16" (4.0 mm) thick and ≥26 mm or ≥30 mm long can be held in the FFM1 and LFFM1, respectively. These mounts use two spring-loaded clamping arms designed to avoid scratching of coated surfaces; simply apply a horizontal force to the spring-loaded clamps, seat the optic into the channel created, and release the clamps, which leaves the optic wedged between a stop and a clamp at each end.

Both the FFM1 and LFFM1 can be directly mounted on posts. The FFM1 can be mounted directly to a Mini Series Post using one of the included 4-40 or M3 cap screws and a #4 counterbore. To mount the filter holder to our Ø1/2" posts, which feature 8-32 (M4) threading, an MSA8 thread adapter is necessary (MSA4/M for metric posts). The LFFM1, however, can be directly mounted to Ø1/2" posts via the #8 (M4) counterbore that accepts 8-32 (M4) cap screws. 

Alternatively, the FFM1 and LFFM1 can be integrated into cage cube systems by using a cage-compatible mounting platform. The FFM1 is compatible with the B3C(/M) or B4C(/M) mounting platforms, while the LFFM1 is compatible with the LB3C(/M) or LB4C(/M) mounting platforms. The FFM1 can accommodate a rectangular or square optic from 26 to 43 mm in length when used with the C4W or C6W Cage Cube, while the LFFM1 can accommodate an optic from 30 to 53 mm in length when used with the LC6W Cage Cube. The height of an optic that can fit within a cage cube is determined by the height of the cube; please see the table to the right for specifications on optic dimensions.

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FFM1 Support Documentation
FFM1Customer Inspired!30-mm-Cage-Compatible Rectangular Filter Mount
$57.25
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LFFM1 Support Documentation
LFFM1Customer Inspired!60-mm-Cage-Compatible Rectangular Filter Mount
$66.50
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Plate Holders

TZ3, Optic Tweezers
Click to Enlarge

FP02 Holder with a Filter
  • Maximum Plate Thickness: 0.58" (14.7 mm)
  • Delrin Tip to Minimize Stress
  • Holders Available in Two Different Widths:
    • FP01: 0.9" (23 mm) Wide with One Clamping Screw
    • FP02: 3.0" (76 mm) Wide with Two Clamping Screws

These general-purpose plate holders secure objects up to 0.58" thick. The clamping screws to secure the plate has a Delrin tip to prevent damage to the optic. The FP01 provides a center-located counterbore for 8-32 (M4) cap screws allows for fastening to our Ø1/2" Posts in addition to other general mounting platforms. For most stable mounting of larger objects, the FP02 features two 8-32 (M4) counterbores for fastening to our Ø1/2" Posts or other general mounting platforms, as well as a center-located mounting hole for a 1/4"-20 (M6) cap screw for direct mounting onto breadboards or other large mounts.

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FP01 Support Documentation
FP01Plate Holder, 0.9" Wide, Holds Plates up to 0.58" Thick
$45.00
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FP02 Support Documentation
FP02Plate Holder, 3.0" Wide, Holds Plates up to 0.58" Thick
$74.00
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XY Translation Mount for Rectangular Optics

Test Target Holder
Click to Enlarge

A channel allows for translation of the lockable support arm for accommodating optics with different widths.
  • Compatible with 1" (25.4 mm) to 3" (76.2 mm) Wide Rectangular Optics
  • Maximum Optic Thickness of 0.12" (3 mm)
  • 50 mm (1.97") Horizontal Travel and 30 mm (1.18") Vertical Travel
  • Each Axis Includes a Vernier Scale that Provides 100 µm Resolution
  • Five Post-Mountable Orientations via Adapter with Five 8-32 (M4) Tapped Holes
  • Four Nylon-Tipped Setscrews Secure the Optic Within Two Mounting Arms

Thorlabs' XYFM1(/M) Test Target Positioning Mount allows for quick and adjustable mounting of 1" (25.4 mm) to 3" (76.2 mm) wide rectangular optics up to 0.12" (3 mm) thick. The mount, which was originally a standard microscope slide holder, was upgraded by Thorlabs to add versatility and ease of use. This makes it ideal for general applications as well as home-built microscopy systems. It is designed for use with our selection of resolution, distortion, slant edge, and calibration test targets. However, it is also compatible with our rectangular filters, dichroic mirrors, variable ND filters, and fluorescence imaging filters.

Two actuators on the side of the mount allow manual positioning over a 50 mm (1.97") x 30 mm (1.18") area. Each axis of translation is equipped with a Vernier scale that provides a resolution of 100 µm, allowing for repeatable positioning of the mounted optic. A square mounting adapter that has five 8-32 (M4) tapped holes (see image to the bottom left) is provided on the back of the mount and is secured in place by the front-located thumbscrew. This allows for various Ø1/2" post-mountable orientations. The different orientations are shown below.

Optics are mounted using two support arms that each contain two nylon-tipped setscrews that use a 0.05" (1.5 mm) hex key. One support arm is fixed, while a second arm is free to move along a channel. The movable arm can be locked in place using a top-located locking screw with a 5/64" (2 mm) hex. This mounting mechanism can be seen in the photo to the above right. If the locking screw is loosened enough, the movable arm can be removed from the channel. It can be reattached using the 2-56 locking nut that is captive in the channel; simply align the locking screw with the nut and tighten.

Please note that the chrome pattern at the edge of a test target may be covered when held between the two mounting arms.

Test Target Mount
Click to Enlarge

An adapter with five 8-32 (M4) taps on the back of the mount allows for various post-mountable orientations (see images to the right).
Test Target Mount
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XYFM1 Mounting a Test Target Horizontally and Centered Over the Post Using a KCP05 Adapter
Test Target Mount
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XYFM1 Mounting a Test Target Vertically to the Left
Test Target Mount
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XYFM1 Mounting a Test Target Vertically to the Right
Test Target Mount
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XYFM1 Mounting a Test Target Perpendicular to the Post Axis
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XYFM1 Support Documentation
XYFM1Customer Inspired!XY Mount for 1" - 3" Rectangular Optics, 8-32 Taps
$184.00
3-5 Days
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XYFM1/M Support Documentation
XYFM1/MCustomer Inspired!XY Mount for 1" - 3" Rectangular Optics, M4 Taps
$184.00
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Last Edited: Apr 11, 2014 Author: Mike Y.