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Terminated Fiber Adapters
Ø2.5 mm Ferrule Adapter
Ø2.5 mm Ferrule Clamp
SM05SMA in an
Threaded & Unthreaded Adapters
These adapters are commonly employed when building single mode or multimode fiber couplers and collimators or in other free-space coupling applications. They can also be utilized to provide light-tight coupling to our SM05- (0.535"-40) or SM1- (1.035"-40) threaded photodetectors and many of our power meter sensors. Our C-Mount-threaded fiber adapters are useful for connecting patch cables to our C-Mount cameras.
Note: The ST and SMA adapters have indents/dimples in the front surface to allow the adapter to be tightened with the SPW801 spanner wrench. Note that these indents do not go all the way through the disk. The FC receptacle is too large to include the tightening indents. Instead we recommend putting an FC connector into the receptacle of the adapter to aid in tightening.
Each disk has four dimples, two in the front surface and two in the back surface, that allow it to be tightened from either side with the SPW909 or SPW801 spanner wrench. The dimples do not go all the way through the disk so that the adapters can be used in light-tight applications when paired with SM1 lens tubes. Once the adapter is at the desired position, use an SM1RR retaining ring to secure it in place.
For an externally SM1-threaded Ø2.5 mm ferrule adapter, please see below.
Each adapter shown here has two small dimples for aligning the adapter with our SPW909 fixed spanner wrench or SPW801 adjustable spanner wrench. The dimples do not go all the way through the disk so that the adapters can be used in light-tight applications.
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HASMA Adapter Attached to an SMA-Terminated Fiber Patch Cable
Thorlabs' Bulkhead Adapters contain one connector for the projection of light into free space, where the light can then be manipulated or used by other optical devices, such as lenses or detectors. Ideal for OEM or custom applications, the design aligns the front face of the connector ferrule with the rear surface of the adapter, as shown in the photo to the right. The lack of a second connector at this surface allows for the projection of light from the fiber into free space. It also allows the fiber to be placed in near-physical contact with any optics or instruments that are placed after the adapter.
The HAFC adapter has a 2.2 mm wide-key-slot FC/PC bulkhead for compatibility with our FC/PC-terminated fiber optic patch cables. Opposite the FC/PC connector is a 3/8"-24 external mounting thread used for mounting the bulkhead adapter into OEM or custom systems.
Our HASMA adapter is 0.38" (9.65 mm) long, with a 1/4"-36 threaded barrel for use with SMA905- and SMA906-style terminated fiber optic patch cables. The threaded barrel can also be used with the lock nut for mounting within OEM or custom systems.
The uncommon mounting threads in these adapters will require the use of custom mounting solutions. We recommend engaging at least two threads for stability when using a custom mount, with thread locker (Loctite) as an option for permanent solutions. If tapping a hole is not an option, the adapters can also be epoxied in place.
If a custom or OEM solution is not desired, both adapters are also available mounted within SM-threaded disks (sold above) for compatibility with our lens tube systems. Fiber and bulkhead caps are also available for preventing damage to the terminated fiber when it is not in use.
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An SM1LCM Adapter Shown in a KM100T SM1-Threaded Kinematic Mount with Ferrule-Terminated Patch Cable
These Adapter Plates allow our patch cables with a Ø1.25 mm or Ø2.5 mm ferrule end to be mounted within SM1-threaded (1.035"-40) systems. A flexure clamp is used to secure the ferrule end of the patch cable; the SM1FCM clamps on a Ø2.5 mm bare ferrule while the SM1LCM clamps on the delrin sleeve of the Ø1.25 mm ferrule-terminated patch cables (see photo to the right).
The flexure clamp on each adapter is secured with a 3-48 cap screw, which is tightened using a 5/64" (2 mm) balldriver or hex key. Approximately 1.25 in-lbs (0.14 N·m) of torque is sufficient to secure the ferrule. When the ferrule is correctly positioned, the distance from the fiber end face to the adapter face is 0.01" (0.3 mm).
The disks are externally SM1-threaded (1.035"-40) and have four dimples, two in the front surface and two in the back surface, that allow it to be tightened from either side using an SPW909 or SPW801 Spanner Wrench. These dimples do not pass through the disk, ensuring the ferrule adapters are light-tight when used with SM1-threaded (1.035"-40) lens tubes. Once the adapter is in the desired position, use an SM1RR retaining ring to secure it in place.
These Post-Mountable Ferrule Clamps allow fiber connectors to be mounted securely and compactly within an experimental setup. See the table below for compatible ferrule diameters and fiber connectors for each clamp. The fiber ferrule is clamped into the flexure mount using a 5/64" (2 mm) hex key. An 8-32 (M4) tapped hole on the bottom of the mount provides compatibility with our Ø1/2" optical posts.