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Precision Beam Collimation & Fiber Coupling

Aspheric Fiber Collimators & Couplers

Precision molded aspheric singlets eliminate spherical aberration to reshape divergent fiber emission into a diffraction-limited Gaussian beam (M² ≈ 1). Factory pre-aligned for FC/PC, FC/APC, and SMA905 receptacles with pointing offset ≤ 0.5° and broadband anti-reflection coatings (>95% transmission).

M² ≈ 1.05

Diffraction-Limited

Gaussian TEM₀₀ output

≥ 60 dB

Return Loss

FC/APC angled polish

≤ 0.5°

Pointing Error

Factory pre-aligned

> 95%

AR Transmission

Double-sided broadband

Zolix Aspheric Fiber Collimators with FC/APC and SMA905 connectors

SUS303 Stainless Steel Compact Package

Pre-aligned fixed-focal-length aspheric singlet. Standard Ø11 mm / Ø12 mm outer diameter.

Standard Aspheric Collimator Lineup

Select your required wavelength, connector interface (FC/APC, FC/PC, SMA905), and click on any model to view complete optical specifications, beam profile measurements, and mechanical dimensions.

1550 nmFC/APC

AFC-FC-APC-1550

1550 nm FC/APC Aspheric Fiber Collimator

Precision pre-aligned aspheric collimator for 1550 nm C/L band telecom single-mode fibers. 8° APC polish provides ≥ 60 dB return loss to protect sensitive DFB and fiber lasers.

Focal Length (f)4.5 mm
Beam Waist (2w₀)~0.85 mm
Divergence (θ)0.07°
Return Loss≥ 60 dB
1310 nmFC/APC

AFC-FC-APC-1310

1310 nm FC/APC Aspheric Fiber Collimator

Single-mode FC/APC aspheric fiber collimator optimized for 1310 nm O-band zero-dispersion telecommunication windows.

Focal Length (f)4.5 mm
Beam Waist (2w₀)~0.81 mm
Divergence (θ)0.06°
Return Loss≥ 60 dB
1064 nmFC/APC

AFC-FC-APC-1064

1064 nm FC/APC Aspheric Fiber Collimator

High-power handling FC/APC aspheric collimator for 1064 nm Nd:YAG, Yb fiber lasers, and seed laser injection.

Focal Length (f)4.5 mm
Beam Waist (2w₀)~0.78 mm
Divergence (θ)0.05°
Return Loss≥ 60 dB
850 nmFC/APC

AFC-FC-APC-850

850 nm FC/APC Aspheric Fiber Collimator

Single-mode aspheric collimator for 850 nm VCSEL and diode laser delivery in spectroscopy and optical coherence tomography.

Focal Length (f)4.5 mm
Beam Waist (2w₀)~0.73 mm
Divergence (θ)0.04°
Return Loss≥ 60 dB
780 nmFC/APC

AFC-FC-APC-780

780 nm FC/APC Aspheric Fiber Collimator

Single-mode aspheric collimator for 780 nm rubidium D2 transition spectroscopy, atomic clocks, and Ti:Sapphire laser delivery.

Focal Length (f)4.5 mm
Beam Waist (2w₀)~0.68 mm
Divergence (θ)0.038°
Return Loss≥ 60 dB
633 nmFC/APC

AFC-FC-APC-633

633 nm FC/APC Aspheric Fiber Collimator

Single-mode aspheric collimator for 633 nm He-Ne lasers, laser diode modules, and visible interferometry.

Focal Length (f)4.5 mm
Beam Waist (2w₀)~0.64 mm
Divergence (θ)0.032°
Return Loss≥ 60 dB
532 nmFC/APC

AFC-FC-APC-532

532 nm FC/APC Aspheric Fiber Collimator

Single-mode aspheric collimator for 532 nm green DPSS and fiber lasers, Raman excitation, and fluorescence microscopy.

Focal Length (f)4 mm
Beam Waist (2w₀)~0.58 mm
Divergence (θ)0.028°
Return Loss≥ 60 dB
405 nmFC/APC

AFC-FC-APC-405

405 nm FC/APC Aspheric Fiber Collimator

Single-mode aspheric collimator for 405 nm blue-violet diode lasers, photolithography, and UV-excited fluorescence.

Focal Length (f)4 mm
Beam Waist (2w₀)~0.52 mm
Divergence (θ)0.024°
Return Loss≥ 60 dB
1550 nmFC/PC

AFC-FC-PC-1550

1550 nm FC/PC Aspheric Fiber Collimator

Standard FC/PC single-mode aspheric collimator for 1550 nm laboratory testbenches and optical instrumentation.

Focal Length (f)4.5 mm
Beam Waist (2w₀)~0.85 mm
Divergence (θ)0.07°
Return Loss≥ 45 dB
1310 nmFC/PC

AFC-FC-PC-1310

1310 nm FC/PC Aspheric Fiber Collimator

Standard FC/PC single-mode aspheric collimator for 1310 nm O-band testing and optical communications research.

Focal Length (f)4.5 mm
Beam Waist (2w₀)~0.81 mm
Divergence (θ)0.06°
Return Loss≥ 45 dB
633 nmFC/PC

AFC-FC-PC-633

633 nm FC/PC Aspheric Fiber Collimator

Standard FC/PC single-mode aspheric collimator for 633 nm visible red laser diodes and helium-neon lasers.

Focal Length (f)4.5 mm
Beam Waist (2w₀)~0.64 mm
Divergence (θ)0.032°
Return Loss≥ 45 dB
532 nmFC/PC

AFC-FC-PC-532

532 nm FC/PC Aspheric Fiber Collimator

Standard FC/PC single-mode aspheric collimator for 532 nm green laser systems and spectroscopy.

Focal Length (f)4 mm
Beam Waist (2w₀)~0.58 mm
Divergence (θ)0.028°
Return Loss≥ 45 dB
550 nmSMA905

AFC-SMA905-VIS

SMA905 Multimode Fiber Collimator (Visible: 400–700 nm)

Heavy-duty SMA905 threaded collimator for visible large-core multimode fibers, high-power industrial lasers, and spectroscopy probes.

Focal Length (f)6 mm
Beam Waist (2w₀)~2.2 mm
Divergence (θ)0.11°
Return Loss20 ~ 30 dB
900 nmSMA905

AFC-SMA905-NIR

SMA905 Multimode Fiber Collimator (NIR: 700–1100 nm)

High-power SMA905 collimator for near-infrared 700–1100 nm laser diodes, fiber lasers, and NIR spectroscopy.

Focal Length (f)6 mm
Beam Waist (2w₀)~2.2 mm
Divergence (θ)0.11°
Return Loss20 ~ 30 dB
1350 nmSMA905

AFC-SMA905-SWIR

SMA905 Multimode Fiber Collimator (SWIR: 1050–1650 nm)

Short-wavelength infrared (SWIR) SMA905 collimator for 1050–1650 nm broadband sources, supercontinuum lasers, and SWIR spectroscopy.

Focal Length (f)6 mm
Beam Waist (2w₀)~2.2 mm
Divergence (θ)0.11°
Return Loss20 ~ 30 dB

Optical Architecture & Beam Performance

Engineered with monolithic aspheric singlets to eliminate spherical aberration completely in both collimation (fiber → space) and coupling (space → fiber) modes.

Ray Tracing: Collimation & Coupling Modes

Fixed-focal-length aspheric singlet reshapes wide-angle divergent fiber output into a collimated parallel beam, or compresses a free-space beam back into the guided single-mode fiber core.

Aspheric collimator optical ray schematic showing collimation and coupling modes

Far-Field Beam Quality (Near Field 0 mm vs Far Field 5 m)

Diffraction-limited Gaussian distribution maintained over distance without high-frequency spatial ripples or diffraction ring degradation (M² ≈ 1).

Beam profile measurement at 0mm near field
Near Field (0 mm)
Beam profile measurement at 5m far field
Far Field (5 m)

Complete Optical Specifications Matrix & Wavelength Bands

Zolix Aspheric Collimator Wavelength Lineup and Optical Specifications Matrix

Need Precision Multi-Axis Stages for Collimator Alignment?

Pair your aspheric collimators with Zolix 3-axis to 6-axis precision fiber alignment stages, kinematic mirror mounts, and 30 mm optical cage systems for sub-micron coupling efficiency.