Kinematic Platform Mounts
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KM200B Mounted on Ø1/2" Post Using an 8-32 Cap Screw
Thorlabs' KM100B(/M) and KM200B(/M) Kinematic Platform Mounts provide kinematic control for prisms and non-standard optics. Each contains several 6-32 (M4) tapped holes for mounting our PM3(/M) or PM4(/M) Clamping Arms (sold below). The design used in the KM100B(/M) and KM200B(/M) offers an unobstructed path from any direction by positioning the knobs below the mounting plane, as shown in the photo to the right.
The KM100B(/M) is a 2" x 2" (52 mm x 52 mm) mount with ±4° of pitch and yaw control, while the KM200B(/M) is a 3" x 3" (77 mm x 77 mm) mount with ±3° of pitch and yaw control. The KM200B(/M) additionally contains five 1/4"-20 (M6) tapped holes and four #8 (M4) counterbores that provide direct mechanical compatibility with standard optomechanics.
The mounting plate is attached using four 4-40 screws and can be replaced to create a custom kinematic mount.
Thorlabs' KM100PM(/M) Kinematic Prism Mount provides kinematic control for prisms, cube beamsplitters, corner cubes, and other optics that require tip and tilt control. It contains eight 6-32 (M4) tapped holes for mounting our PM3(/M) or PM4(/M) Clamping Arms (sold below). The design used in the KM100PM(/M) orients the knobs in the usual vertical plane.
The two-piece mounting platform assembly is secured to the front plate using two 4-40 screws (3/32 hex), allowing for a left- or right-handed kinematic mount. The two pieces of the mounting platform assembly are held together with two 3-48 screws [5/64 (2 mm) hex]. The animation to the right shows how to convert between the left- and right-handed orientations. If desired, the mounting plate can also be removed and replaced with a user-supplied alternative, enabling custom mounting options.
Thorlabs' PM3(/M) and PM4(/M) Clamping Arms use a nylon-tipped setscrew to secure an optic to our KM100B(/M), KM200B(/M), or KM100PM(/M) Kinematic Platform Mounts. The PM3(/M) accommodates optics as tall as 0.97" (24.6 mm) and features a 0.69" (17.5 mm) long clamping arm. In contrast, the PM4(/M) accommodates optics as tall as 1.61" (40.9 mm) and features a 1.16" (29.3 mm) long clamping arm.
The clamping arm is held to the post using a flexure mechanism that locks with a 5/64" (2 mm) balldriver or hex key. The post includes a Ø0.09" (Ø2.3 mm) through hole that provides added torque when tightening the post to the mounting plate.
The PM3(/M) clamping arm can be used to hold 1" (25.4 mm) tall optics with the addition of a second post. Without the second post, the top surface of the clamping arm will be positioned above the top of the post, causing less-than-full engagement of the flexure mechanism.