CFP5-980A

• Designed for 980 nm operation with factory alignment at the design wavelength.
• Uses PM980-XP polarization-maintaining single-mode fiber.
• FC/APC connector helps minimize back reflections in laser and fiber-optic systems.
• 4.66 mm effective focal length (EFL) for compact beam collimation.
• 0.53 lens NA provides efficient light collection and high numerical aperture.
• 3.0 mm clear aperture.
• Low full-angle beam divergence: 1.42 mrad (+0.17 / -0.00 mrad).
• 0.88 mm 1/e² output beam diameter.
• Minimum extinction ratio of 20 dB for polarization-maintaining performance.
• 650–1050 nm broadband AR coating with average reflectance below 0.5%.
• Insertion loss <0.7 dB.
• Return loss ≥50 dB.
• Supplied with 1 m of PM980-XP fiber.
• Compact 5.7 mm stainless-steel housing.
• Non-magnetic housing is suitable for applications sensitive to magnetic materials.
• The fiber's slow axis is mechanically referenced to the connector key and housing markings for polarization alignment.

The Thorlabs CFP5-980A is a compact polarization-maintaining (PM) pigtailed aspheric fiber collimator designed for operation at 980 nm.

The collimator combines a PM980-XP single-mode fiber with an aspheric lens in a compact stainless-steel housing. The fiber and lens are factory-aligned to produce a low-divergence free-space beam at the specified 980 nm alignment wavelength. The design provides a convenient interface between a polarization-maintaining fiber and a free-space optical system.

With an effective focal length of 4.66 mm and a lens numerical aperture of 0.53, the CFP5-980A provides efficient coupling between the fiber mode and the free-space beam. At the 980 nm design wavelength, the collimated output has a theoretical full-angle divergence of approximately 1.42 mrad, with a 1/e² beam diameter of 0.88 mm.

A key feature of the CFP5-980A is its polarization-maintaining fiber. The PM980-XP fiber is designed to preserve the polarization state of light, while the fiber's slow axis is mechanically aligned with the connector key and the reference markings on the collimator housing. This makes the device useful in systems where polarization orientation must be maintained and accurately aligned.

The collimator uses a broadband 650–1050 nm AR coating with average reflectance below 0.5%, providing good transmission over a broad wavelength range. However, the lowest beam divergence and specified collimation performance are achieved at the 980 nm alignment wavelength.

The CFP5-980A is supplied with 1 meter of PM980-XP fiber terminated with an FC/APC connector. The angled physical contact connector helps reduce optical back reflections, making it suitable for laser systems and other polarization-sensitive fiber-optic setups.

Product Type: PM Pigtailed Aspheric Collimator
Part Number: CFP5-980A
Alignment Wavelength: 980 nm
Fiber Type: PM980-XP Polarization-Maintaining Fiber
Fiber Length: 1 m
Connector Type: FC/APC, 2.0 mm Narrow Key
Effective Focal Length (EFL): 4.66 mm
Lens Numerical Aperture (NA): 0.53
Clear Aperture: Ø3.0 mm
AR Coating Range: 650–1050 nm
Average Reflectance: Ravg <0.5%
Output Beam Diameter: 0.88 mm (1/e²)
Waist Distance: 4.14 mm
Full-Angle Beam Divergence: 1.42 mrad (+0.17 / -0.00 mrad)
Minimum Extinction Ratio: 20 dB
Mode Field Diameter: 6.6 ± 0.5 µm @ 980 nm
Insertion Loss: <0.7 dB
Return Loss: ≥50 dB
Housing Outer Diameter: 5.7 mm
Housing Material: Stainless Steel
Fiber Type: Polarization Maintaining, Single Mode

The specified 1.42 mrad full-angle divergence and 0.88 mm beam diameter are associated with operation at the 980 nm alignment wavelength. The PM fiber has a mode field diameter of 6.6 ± 0.5 µm at 980 nm.

The CFP5-980A is suitable for a wide range of fiber-optic, laser, and photonics applications, including:

• 980 nm Laser Beam Delivery
• Polarization-Maintaining Fiber Systems
• Fiber-to-Free-Space Coupling
• Free-Space-to-Fiber Coupling
• Single-Mode Fiber Collimation
• Polarization Control
• Polarization-Sensitive Measurements
• Laser Beam Alignment
• Optical Signal Injection
• Fiber-Optic Sensing
• Interferometry
• Spectroscopy
• Microscopy
• Nonlinear Optics
• Quantum Optics
• Photonics Research
• Scientific and Laboratory Optical Systems

The CFP5-980A is particularly useful when a system requires a stable, low-divergence 980 nm free-space beam while maintaining the polarization state of light delivered through a PM fiber. Its FC/APC interface, high-NA aspheric lens, and PM980-XP fiber make it suitable for precision laser and fiber-optic systems where both beam quality and polarization stability are important.