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Collimators

It is packaged by precise positioning of fiber pigtail and focusing lens, which can transform the output light of fiber into  parallel  light  beam  (Gaussian  beam)or couple external parallel light into the fiber. It can also be used alone to achieve the required spot size at a specific position according to ...

Specifications

Wavelength: 400~1700nm
Bandwidth: ±20nm
WD: 100mm, 300mm, 1000mm
Waist Beam: 0.27~1.48mm
Divergence Angle: 0.7~4.5mrad
It is assembled precisely by PM fiber pigtail and a Grin lens or C-Lens, which can convert the divergent light into a parallel beam (Gaussian beam) from fiber export ,or couple space parallel light into the fiber. It can be used  singly to achieve a specified beam size at the required position, or paired with  other optical ...

Specifications

Wavelength: 600~1600nm
Bandwidth: ±20mm
WD: 100~1000mm
Waist Beam: 0.37~1.55mm
Divergence Angle: 0.7~4.4mrad
It also known as the non-deviation angle fiber optic collimator, its core characteristic lies in the nearly perfect coincidence between the output optical axis of the collimator and the mechanical axis. This design eliminates the need for precise adjustment of the output angle of the light beam during the installation process, ...

Specifications

Wavelength: 800~1300nm
Working Distance: 0~80mm
Waist Beam: 0.36~0.75mm
Deflection Angle: <0.1°
Divergence Angle: <12mrad
It adopts a compact structural design. The pigtail fiber with an inclination angle and the aspherical lens are precisely adjusted, ensuring that the emitted light presents a high-quality Gaussian beam and has excellent collimation characteristics at the same time. Anti-reflection films are coated on both the surfaces of the lens and ...

Specifications

Wavelength: 400~1600nm
Bandwidth: ±5nm
Waist Beam Size: 0.82~4.0mm
Divergence Angle: 0.015°+0.01°~0.11°+0.01°
EFL: 4.45~18.75mm
It boasts a compact and ingeniously designed structure. The angled pigtail fiber with a inclination angle and the aspherical lens undergo meticulous and precise adjustments. This meticulous calibration ensures that the emitted light manifests as a high-quality Gaussian beam, and simultaneously endowing the collimator with exceptional ...

Specifications

Wavelength: 500~1600mm
Bandwidth: ±5nm
Waist Beam Size: 0.84~4.0mm
Divergence Angle: 0.01°+0.01°~0.11°+0.01°
EFL: 4.59~18.75mm
It consists of a group of long focal length collimating optical systems with chromatic aberration and distortion compensation design, making the focal length of the collimator insensitive to wavelength bandwidth. The divergent light beam emitted from the optical fiber, providing a good collimating effect and beam shape within a ...

Specifications

Wavelength: 400~1700nm
Bandwidth: ±10nm
Waist Beam: 0.87~3.95mm
Divergence Angle: 0.014+0.01°~0.062+0.01°
EFL: 4.06~20.12mm
It is engineered with a spring-fitted optical lens housed within its mechanical structure. It serves to collimate the  fiber-emitted light beam and can also be utilized for coupling spatial light into the fiber. By rotating the outer sleeve off the collimator, the internal optical lens can be precisely translated along the ...

Specifications

EFL: 4.5~11mm
Waist Beam: 0.86~2.35mm
AR Coating: 400~1700nm, R<0.5%
Far-field Divergence Angle: 0.02°+0.01°~0.13°+0.01°
Input Fiber MFD: 3.5~10.4um
The fiber optic beam can be collimated and shaped for different lasers output through fiber optic connections, providing diffraction-limited performance at the design wavelength, with a collimation distance of up to 200 meters. The structure of this series of collimators is compact. Aberration correction is performed during design by ...

Specifications

Wavelength: 400~1700nm
Bandwidth: ±30nm
Waist Beam: 10.2~15.2
Divergence Angle: 0.06mrad~0.14mrad
EFL: 66.5~76.0mm
For laser collimation or coupling at up to 300 meters, we've carefully designed the collimating lens with a focal length of around 150 mm. This effectively collimates and shapes the fiber-emitted laser beam, yielding a high-quality beam with a larger beam. The lens uses an advanced multi-air-spaced lens design. It outputs a beam of ...

Specifications

Wavelength: 400~1700nm
Bandwidth: ±30nm
Waist Beam: 22.89~34.8mm
Divergence Angle: 0.043+0.03~0.075+0.03mrad
EFL: 136~154.2mm
Using a 90°off-axis parabolic mirror, the focal length of this mirror remains constant over a wide wavelength range. Therefore, it is the ideal choice for collimating wide spectral wavelength light when precise focal adjustment is required, serving as a collimated multi-color light source or coupling device. A silver coating is ...

Specifications

Wavelength: 450nm~20um
AR Coating: Silver film/ Aluminum film
Reflectance: >90%
Export Beam Diameter: 2~12mm
Numerical Aperture: 0.4、 0.36、0.167、0.216
By using an air gap bonded lens, it can provide better beam quality than aspherical lenses and achromatic lenses in terms of collimation performance. The design of a low aberration lens group can achieve a beam closer to a Gaussian beam, with smaller divergence angles and smaller wavefront errors.

Specifications

Wavelength: 405~1654nm
Bandwidth: ±30nm
Waist Beam: 5.0mm~8.6mm
Divergence Angle: 0.10~0.30mrad
EFL: 33.2mm~37.2mm
By using an air gap bonded lens, it can provide better beam quality than aspherical lenses and achromatic lenses in terms of collimation performance. The design of a low aberration lens group can achieve a beam closer to a Gaussian beam, with smaller divergence angles and smaller wavefront errors.

Specifications

Wavelength: 450~1550nm
Bandwidth: ±30nm
Waist Beam: 14.6~19.4mm
Divergence Angle: 2.2~12.8mrad
EFL: 33.5~37.1
When the connector and the fiber remain stationary, the internal lens has five alignment degrees of freedom: linear alignment in the X and Y directions, pitch and yaw alignment angles, and adjustment of the Z-axis using both pitch and yaw. The travel range in the X and Y directions is ±0.7mm, the travel range in the Z ...

Specifications

Wavelength: 350-1650nm
EFL: 4.6-11.0nm
Fiber MFD: 3.5um, 5.0um, 10.4um
Waist Beam: 0.75mm~2.09mm
Divergence Angle: 0.32~2.27mrad
When the connector and the fiber remain stationary, the internal lens has five alignment degrees of freedom: linear alignment in the X and Y directions, pitch and yaw alignment angles, and adjustment of the Z-axis using both pitch and yaw. The travel range in the X and Y directions is ±0.7mm, the travel range in the Z ...

Specifications

Wavelength: 350-1650nm
EFL: 7.5mm, 10mm
Fiber MFD: 3.5um, 5.0um, 10.4um
Waist Beam: 1.23mm, 1.62mm, 1.42mm, 1.64mm, 2.16mm, 1.99mm
Divergence Angle: 0.47mra, 0.67mrad, 1.39mrad, 0.35mrad, 0.50mrad, 0.99mrad
The aspherical lens's unique aberration-correction design empowers it to execute highly efficient and accurate collimation of light beams. As a result, the energy of the output light beam assumes a Gaussian distribution. Both surfaces of the lens are coated with anti-reflection films, that significantly decrease surface reflection ...

Specifications

Wavelength: 405 nm
Export Beam Size: 0.8 mm
Divergence Angle: 0.06°+0.01°
Package Dia.: Φ11 mm,Φ12 mm
Bandwidth: ±5 nm
The LB20 Large Beam Fiber Collimator is a precision-engineered optical device designed for applications requiring highly collimated Gaussian beams and minimal optical aberrations. Operating at a nominal wavelength of 1550 nm, this fiber collimator delivers exceptional performance in a wide range of photonics applications including ...

Specifications

Wavelength: 1550 nm
Beam Size (1/e², NA=0.13): 15 mm
Beam Divergence: <0.5 mrad
Wavefront Error: ≤ λ/10
Pointing Error: <0.1 mrad
Elevate your fiber optic components with the 1064nm Polarization Maintaining Single Fiber Collimator, a foundational element for in-line PM fiber optics devices such as PM isolators and PM DWDM. Engineered for precision and reliability, this collimator boasts a low insertion loss, high extinction ratio, and impressive return ...

Specifications

Operating Wavelength: 1064 nm
Operating Wavelength Range: ±30 nm
Max. Working Distance: 20 mm
Max. Insertion Loss (λc @1064nm): 0.40 dB
Waist Beam Diameter: ~0.45 mm
The High Power 1080nm Large Beam Fiber Collimator is designed for high power fiber lasers and fiber amplifiers. These collimators effectively reduce the power density at the output fiber facet. With low insertion loss, high power handling capability, and excellent temperature stability, they offer reliable performance at a low cost. ...

Specifications

Central Wavelength: 1080 nm
Operating Wavelength Range: ±20 nm
Beam Diameter: 5±1, 7±1 mm
Working Distance: 1000 or Specify mm
Max. Insertion Loss (at 1000mm): 0.60 dB
Introducing our Refocusing & Collimating Fiber/Lens Objective, the perfect accessory for your mid-infrared fiber spectroscopy needs. This advanced objective is designed to provide precise refocusing and collimation of light in your spectroscopy experiments. Experience the reliability and versatility of our Refocusing & ...

Specifications

Z-Translation Stage: Adjustable in ±5 mm range
Lens Material: ZnSe or Ge (on request)
Lend Diameter: Ø15 mm
Focal Length: f = 20 mm or 10 mm (on request)
AR Coating: 3-5.5µm or 8-12µm (on request)
Ascentta manufactures a wide range of optical fiber collimators for the applications required the high performance collimation of lights. The product line offers various  configurations of collimators for different wavelength ranges, working distance, single mode, multi mode or polarization maintaining fiber types.  Please ...

Specifications

Insertion Loss: 0.25 dB
Extinction Ratio: 22 dB
Working Distance: <100 mm

Frequently Asked Questions

A fiber collimator contains an objective lens that can focus the beam to a small spot or expand it. When the source is placed at the focal point of the lens, the lens will increase the diameter of the beam and the rays will come out parallel. On the other hand, if the incoming beam is already collimated, then the lens will focus it at the focal point.

Numerical aperture is a parameter related to the acceptance angle of a lens or a fiber. This angle is defined as the largest angle a lens, or a fiber can collect. This means that rays coming in at an angle larger than this angle will be clipped and will not couple into the fiber or be imaged by a lens. Numerical aperture is an important parameter in fiber collimators as it indicates how much a beam can be expanded and how much light gets collected.

Fiber collimators are generally comprised of an objective lens fused together with an optical fiber near its facet. Typically, this lens is a few millimeters in diameter or less. The fusion of the lens and the fiber eliminates air gaps and does not require the gluing using epoxies which makes it ideal for handling high power beams.

Divergence is a measure of how fast the diameter of a circular beam or ray of fans increases as we move out of the system. For Gaussian beam such as lasers, it is an angle defined as a function of wavelength and beam waist. Ideally, a perfectly collimated source would have a 0-divergence angle. However, even the best-collimated sources such as lasers still have some degree of divergence on the order of a few milliradians.

In addition to collimating rays of light, collimators can also serve as a positive lens that focuses the light emitted by a laser to a smaller spot that can be coupled into an optical fiber. Collimators can also realize coupling between 2 fibers and they provide control over the diameter of the beam. Using a collimator, one can make a beam expand a beam or focus it tightly.

Fiber collimators are often used as couplers that couple laser light into small optical fibers. They are widely for illumination by expanding the output beam of the fiber or for testing and inspection.

Fiber Optic Collimators: Precision Beam Control for Fiber-Coupled Systems

Fiber optic collimators are key components in photonics systems that transform the divergent light emerging from an optical fiber into a parallel (collimated) beam. These versatile devices are widely used in fiber optic communications, laser systems, spectroscopy, and sensing applications. On FindLight, you can explore a broad selection of high-precision fiber collimators designed for single-mode, multi-mode, and polarization-maintaining fibers, from trusted global suppliers.

What Are Fiber Optic Collimators?

A fiber collimator typically consists of a fiber connector aligned to a precision lens—often an aspheric or GRIN (graded-index) lens—housed within a rigid metal barrel. The lens focuses the diverging light emitted from the fiber core into a parallel beam, allowing for efficient free-space propagation, optical coupling, or interaction with other components.

Collimators are crucial when integrating fiber optics with bulk optics, such as mirrors, beam splitters, or interferometers. They’re also essential in minimizing signal loss and preserving beam quality in systems requiring free-space transmission over short distances.

Key Features and Benefits

  1. Highly Collimated Output: Delivers parallel light beams with minimal divergence, essential for accurate optical alignment.

  2. Low Insertion and Return Loss: Designed for optimal optical performance, ensuring efficient light coupling and minimal signal reflection.

  3. Multiple Wavelength Options: Available for telecom wavelengths (1310 nm, 1550 nm), visible light, and even mid-IR applications.

  4. Customizable Design: Offered in various lens types, working distances, beam diameters, and connector formats (FC, SC, LC, SMA, and more).

  5. Robust Construction: Housed in precision-machined barrels for long-term reliability in laboratory and industrial settings.

Common Applications

Fiber optic collimators are used in a wide variety of optical systems, including:

  • Fiber-to-free-space coupling

  • Laser beam delivery systems

  • Wavelength division multiplexing (WDM)

  • Fiber optic sensing

  • Optical alignment and testing

  • Interferometry and spectroscopy

They are often employed as input/output ports for circulators, isolators, and other bulk optic devices requiring high alignment precision.

How to Choose the Right Collimator

Selecting the right fiber collimator depends on:

  • Wavelength Range: Ensure the lens and coating are optimized for your operating wavelength.

  • Beam Diameter: Choose a size based on how tightly or broadly you need to collimate the beam.

  • Working Distance: The optimal distance over which the beam remains collimated.

  • Connector Type: Match with your existing fiber connector (e.g., FC/APC for low back-reflection).

  • Fiber Type: Available for single-mode, multi-mode, and PM fiber configurations.

At FindLight, you can filter by these specifications to quickly identify the most suitable product.

Shop High-Performance Fiber Collimators on FindLight

FindLight connects you with manufacturers offering premium fiber optic collimators for any application—from telecom networks to high-end optical labs. With detailed product listings, downloadable datasheets, and direct RFQ options, finding the right component has never been easier.

Did You know?

The word "collimate" derives its origin from the Latin verb collimare, which is a misreading of collineare, meaning "to direct in a straight line’’. Going back to the history, it was Henry Kater who, in 1825, invented the world’s first collimator, which had applications in practical astronomy. Optical collimators are now widely used as instruments for calibration and alignment in gunsights, fiber optics and various telescopic devices. The primary function of a collimator is to make light beams parallel, so that the spread is minimized upon propagation.