The divergence angle listed in the specifications table above is the measured beam divergence angle when using the fiber collimator at its design wavelength with the specific fiber denoted in the specifications table footnote. This divergence angle is easy to approximate theoretically using the formula shown below as long as the light emerging from the fiber has a Gaussian intensity profile. This works well for single mode fibers, but will underestimate the divergence angle for multimode fibers where the light emerging from the fiber has a non-Gaussian intensity profile.

1-Case;  2- Lens;  3- Z-translation stage;  4- SMA-Adaptor   5. Technical References   1) Theoretical Approximation of the Divergence Angle:   The divergence angle listed in the specifications table above is the measured beam divergence angle when using the fiber collimator at its design wavelength with the specific fiber denoted in the specifications table footnote. This divergence angle is easy to approximate theoretically using the formula shown below as long as the light emerging from the fiber has a Gaussian intensity profile. This works well for single mode fibers, but will underestimate the divergence angle for multimode fibers where the light emerging from the fiber has a non-Gaussian intensity profile.   The divergence angle (in Degrees)    θ ≈ (D/f)(180/3.1415927)  where D and f must be in the same units. θ  is Divergence Angle, D is Mode-Field Diameter (MFD) and  f is Focal Length of Collimator   Example Calculation: When the SF220SMA-A collimator is used to collimate 515 nm light emerging from a 460HP fiber with a mode field diameter (D) of 3.5 �m and a focal length (f) of approximately 11.0 mm (not exact since the design wavelength is 543 nm), the divergence angle is approximately given by   θ ≈ (0.0035 mm / 11.0 mm) x (180 / 3.1416) ≈ 0.018�.   When the beam divergence angle was measured for the SF220SMA-A collimator a 460HP fiber was used with 543 nm light. The result was a divergence angle of 0.018�.   2) Optical Coating:      3) Collimation Package Selection Guide:   We offer several different families of collimation packages, which are summarized in the table below. Our selection of fixed fiber collimators include packages with aspheric lenses, which mate with SMA and FC connector. For larger beams, our air-spaced doublet collimators are ideal.   Family Brief Description Fixed FC or SMA Fiber Collimators These collimators are designed to couple a free-space laser beam into an optical fiber. Each collimation package is factory aligned to provide diffraction-limited performance at one of six wavelengths: 405, 543, 633, 1064, 1310, or 1550 nm. Although it is possible to use the collimator at detuned wavelengths, they will only perform optimally at the design wavelength due to chromatic aberration, which causes the effective focal length of the spheric lens to have a wavelength dependence. Low Divergence Collimators For large beam diameters (�6.6 - �8.5 mm), we offer FC/PC, SMA, and FC/APC air-spaced doublet collimators. These collimation packages are pre-aligned at the factory to collimate a laser beam propagating from the tip of an FC or SMA conectorized fiber and provide diffraction-limited performance at the design wavelength. Adjustable Fiber Collimators These snap-on collimators are designed to connect onto the end of an FC/PC or FC/APC connector and contain an AR-coated aspheric lens. The distance between the aspheric lens and the tip of the FC-terminated fiber can be adjusted to compensate for focal length changes or to recollimate the beam at the wavelength and distance of interest. Pigtailed Collimators Our pigtailed collimators come with one meter of either single mode or multimode fiber, have the fiber and AR-coated aspheric lens rigidly potted inside the stainless steel housing, and are collimated at one of five wavelengths: 532, 1030, 1064, 1310, or 1550 nm. Although it is possible to use the collimator at any wavelength within the coating range, the coupling loss will increase as the wavelength is detuned from the design wavelength. GRIN Fiber Collimators We offer four gradient index (GRIN) fiber collimators that are aligned for either 1310 nm or 1550 nm and have either FC connectorized or unterminated fibers. Our GRIN collimators feature a �1.8 mm clear aperture, are AR-coated to ensure low back reflection into the fiber, and are coupled to standard Corning SMF-28 single mode fibers. GRIN Lenses These graded-index (GRIN) lenses are AR coated for applications at 1300 or 1560 nm that require light to propagate through one fiber, then through a free-space optical system, and finally back into another fiber. They are also useful for coupling light from laser diodes into fibers, coupling the output of a fiber into a detector, or collimating laser light. Pigtailed Ferrules Our pigtailed ferrules have broadband AR coatings centered at either 1310 nm or 1550 nm and are available with either a 0o or 8o angled face. These pigtailed ferrules include 1.5 meters of SMF-28e fiber. FiberPorts These new compact, ultra-stable FiberPort micropositioners provide an easy-to-use, stable platform for coupling light into and out of FC/PC, FC/APC, or SMA terminated optical fibers. It can be used with single mode, multimode, or PM fibers and can be mounted onto a post, stage, platform, or laser. The built-in aspheric lens is available with three different AR coatings and has five degrees of alignment freedom (3 translational and 2 rotational). The compact size and long-term alignment stability make the FiberPort an ideal solution for fiber coupling, collimation, or incorporation into OEM systems.      Fiber    Fiber Delivery

These packages can be used to couple a free-space laser beam into  an optical fiber. To obtain a high coupling efficiency, the NA of the patch cable needs  to be greater than or equal to the NA of the  collimator, and the diameter of the focused beam needs to be smaller than the MFD of the fiber.  Please  refer to the Technical Specs for suggested mounting adapters.

We offer several different families of collimation packages, which are summarized in the table below. Our selection of fixed fiber collimators include packages with aspheric lenses, which mate with SMA and FC connector. For larger beams, our air-spaced doublet collimators are ideal.

Avantesusa

a For optimal collimation, these packages should be used at the alignment wavelength. For some applications, they may also be used within the AR coating range. Contact Tech Support for custom-alignment packages.

These fiber collimation packages are pre-aligned to collimate light from an SMA connectorized fiber with diffraction-limited performance. Because these fiber collimators have no movable parts, they are compact and not susceptible to misalignment. Due to chromatic aberration, the effective focal length (EFL) of the aspheric lens is wavelength-dependent. As a result these collimators will only perform optimally at the design wavelength. The aspheric lens is factory-aligned so that it is one wavelength-adjusted focal length away from the fiber tip when inserted into the collimator. In addition, the aspheric lens has an AR coating that minimizes surface reflections.

where D and f must be in the same units. θ  is Divergence Angle, D is Mode-Field Diameter (MFD) and  f is Focal Length of Collimator

Collimating Coupler                                                      Refocusing objective  1-Case;  2- Lens;  3- Z-translation stage;  4- SMA-Adaptor   5. Technical References   1) Theoretical Approximation of the Divergence Angle:   The divergence angle listed in the specifications table above is the measured beam divergence angle when using the fiber collimator at its design wavelength with the specific fiber denoted in the specifications table footnote. This divergence angle is easy to approximate theoretically using the formula shown below as long as the light emerging from the fiber has a Gaussian intensity profile. This works well for single mode fibers, but will underestimate the divergence angle for multimode fibers where the light emerging from the fiber has a non-Gaussian intensity profile.   The divergence angle (in Degrees)    θ ≈ (D/f)(180/3.1415927)  where D and f must be in the same units. θ  is Divergence Angle, D is Mode-Field Diameter (MFD) and  f is Focal Length of Collimator   Example Calculation: When the SF220SMA-A collimator is used to collimate 515 nm light emerging from a 460HP fiber with a mode field diameter (D) of 3.5 �m and a focal length (f) of approximately 11.0 mm (not exact since the design wavelength is 543 nm), the divergence angle is approximately given by   θ ≈ (0.0035 mm / 11.0 mm) x (180 / 3.1416) ≈ 0.018�.   When the beam divergence angle was measured for the SF220SMA-A collimator a 460HP fiber was used with 543 nm light. The result was a divergence angle of 0.018�.   2) Optical Coating:      3) Collimation Package Selection Guide:   We offer several different families of collimation packages, which are summarized in the table below. Our selection of fixed fiber collimators include packages with aspheric lenses, which mate with SMA and FC connector. For larger beams, our air-spaced doublet collimators are ideal.   Family Brief Description Fixed FC or SMA Fiber Collimators These collimators are designed to couple a free-space laser beam into an optical fiber. Each collimation package is factory aligned to provide diffraction-limited performance at one of six wavelengths: 405, 543, 633, 1064, 1310, or 1550 nm. Although it is possible to use the collimator at detuned wavelengths, they will only perform optimally at the design wavelength due to chromatic aberration, which causes the effective focal length of the spheric lens to have a wavelength dependence. Low Divergence Collimators For large beam diameters (�6.6 - �8.5 mm), we offer FC/PC, SMA, and FC/APC air-spaced doublet collimators. These collimation packages are pre-aligned at the factory to collimate a laser beam propagating from the tip of an FC or SMA conectorized fiber and provide diffraction-limited performance at the design wavelength. Adjustable Fiber Collimators These snap-on collimators are designed to connect onto the end of an FC/PC or FC/APC connector and contain an AR-coated aspheric lens. The distance between the aspheric lens and the tip of the FC-terminated fiber can be adjusted to compensate for focal length changes or to recollimate the beam at the wavelength and distance of interest. Pigtailed Collimators Our pigtailed collimators come with one meter of either single mode or multimode fiber, have the fiber and AR-coated aspheric lens rigidly potted inside the stainless steel housing, and are collimated at one of five wavelengths: 532, 1030, 1064, 1310, or 1550 nm. Although it is possible to use the collimator at any wavelength within the coating range, the coupling loss will increase as the wavelength is detuned from the design wavelength. GRIN Fiber Collimators We offer four gradient index (GRIN) fiber collimators that are aligned for either 1310 nm or 1550 nm and have either FC connectorized or unterminated fibers. Our GRIN collimators feature a �1.8 mm clear aperture, are AR-coated to ensure low back reflection into the fiber, and are coupled to standard Corning SMF-28 single mode fibers. GRIN Lenses These graded-index (GRIN) lenses are AR coated for applications at 1300 or 1560 nm that require light to propagate through one fiber, then through a free-space optical system, and finally back into another fiber. They are also useful for coupling light from laser diodes into fibers, coupling the output of a fiber into a detector, or collimating laser light. Pigtailed Ferrules Our pigtailed ferrules have broadband AR coatings centered at either 1310 nm or 1550 nm and are available with either a 0o or 8o angled face. These pigtailed ferrules include 1.5 meters of SMF-28e fiber. FiberPorts These new compact, ultra-stable FiberPort micropositioners provide an easy-to-use, stable platform for coupling light into and out of FC/PC, FC/APC, or SMA terminated optical fibers. It can be used with single mode, multimode, or PM fibers and can be mounted onto a post, stage, platform, or laser. The built-in aspheric lens is available with three different AR coatings and has five degrees of alignment freedom (3 translational and 2 rotational). The compact size and long-term alignment stability make the FiberPort an ideal solution for fiber coupling, collimation, or incorporation into OEM systems.      Fiber    Fiber Delivery

b Collimated Beam Diameter: Theoretical 1/(e2) diameter @ 1 focal length from lens; fibers: 460HP (-A), SM600 (-B), SMF-28e (-C & -1550)

We also offer a line of adjustable collimation packages called Fiber Ports that are well suited for a wide range of wavelengths. These are ideal solutions for adjustable, compact fiber couplers. For other collimation and coupling options, please contact our technical support group.

AvantesAvaSpec 2048 manual

The SF240APC, SF260APC, SF280APC, and SF671APC Series of fiber collimation packages are pre-aligned to collimate a laser beam propagating from the tip of an FC/APC (2.1 mm wide key compatible) connectorized fiber with diffraction-limited performance at the design wavelength. The receptacle of the housing is angled, and the beam is aligned with the mechanical axis of the package, as shown in the schematic above. Because the F200-Series fiber collimators have no movable parts, they are compact and not susceptible to misalignment. Due to chromatic aberration, the effective focal length (EFL) of the aspheric lens is wavelength-dependent. As a result, these collimators will only perform optimally at the design wavelength. The aspheric lens is factory-aligned so that it is one focal length away from the fiber tip when inserted into the collimator. This distance is equal to the focal length of the aspheric lens at the design wavelength. In addition, the aspheric lens has an AR coating that minimizes surface reflections.

Torch Bearerspectrometer

When the SF220SMA-A collimator is used to collimate 515 nm light emerging from a 460HP fiber with a mode field diameter (D) of 3.5 �m and a focal length (f) of approximately 11.0 mm (not exact since the design wavelength is 543 nm), the divergence angle is approximately given by

The FC/APC conectorized collimation packages are ideal for systems that are sensitive to back reflections. APC-Style connectors utilize a ferrule that has an 8� end face, and in conjunction with an ultra PC polish, provide a return loss Greater than 60 dB.

Avantes is a renowned manufacturer of high-quality lab equipment and accessories with a wide range of analogues, each offering unique advantages to researchers and professionals in the scientific field. One example of their cutting-edge products is the AvaSpec 2048 FT spectrometer, which combines high-resolution optics with a Fourier Transform (FT) spectrum acquisition system, enabling precise spectral analysis in a compact design. This spectrometer is ideal for applications such as chemical analysis, environmental monitoring, and medical diagnostics. Another notable product from Avantes is the USB2 series of spectrometers, which provides an easy-to-use solution for reliable and fast spectral measurements. With high-speed USB 2.0 connectivity, these spectrometers offer excellent sensitivity, low dark noise, and a wide dynamic range. They are suitable for various research applications, including fluorescence and Raman spectroscopy. Avantes also offers a variety of accessories to enhance their lab equipment's performance and versatility. Examples include fiber optics, which enable efficient light delivery to the spectrometers, and light sources such as xenon and tungsten halogen lamps that provide a stable light output for accurate measurements. Additionally, Avantes offers integrating spheres for measuring absolute intensities and reflection properties of samples, and various sampling probes for in situ measurements. Overall, Avantes' lab equipment and accessories are highly regarded for their precision, reliability, and ease of use, making them indispensable tools for researchers in fields ranging from life sciences to materials analysis.

a For optimal collimation these packages should be used at the alignment wavelength. For some applications they may also be used within the AR coating range. Contact us for custom alignment packages.

Edmund OpticsSpectrometer

These graded-index (GRIN) lenses are AR coated for applications at 1300 or 1560 nm that require light to propagate through one fiber, then through a free-space optical system, and finally back into another fiber. They are also useful for coupling light from laser diodes into fibers, coupling the output of a fiber into a detector, or collimating laser light.

a For optimal collimation, these packages should be used at the alignment wavelength. For some applications, they may also be used within the AR coating range. Contact Tech Support.

Our pigtailed ferrules have broadband AR coatings centered at either 1310 nm or 1550 nm and are available with either a 0o or 8o angled face. These pigtailed ferrules include 1.5 meters of SMF-28e fiber.

Our pigtailed collimators come with one meter of either single mode or multimode fiber, have the fiber and AR-coated aspheric lens rigidly potted inside the stainless steel housing, and are collimated at one of five wavelengths: 532, 1030, 1064, 1310, or 1550 nm. Although it is possible to use the collimator at any wavelength within the coating range, the coupling loss will increase as the wavelength is detuned from the design wavelength.

AvantesVarius

These new compact, ultra-stable FiberPort micropositioners provide an easy-to-use, stable platform for coupling light into and out of FC/PC, FC/APC, or SMA terminated optical fibers. It can be used with single mode, multimode, or PM fibers and can be mounted onto a post, stage, platform, or laser. The built-in aspheric lens is available with three different AR coatings and has five degrees of alignment freedom (3 translational and 2 rotational). The compact size and long-term alignment stability make the FiberPort an ideal solution for fiber coupling, collimation, or incorporation into OEM systems.

b Collimated Beam Diameter: Theoretical 1/(e2) diameter @ 1 focal length from lens; fibers: 460HP (-A), SM600 (-B), SMF-28e (-C)

Opticalspectrometer

These collimators are designed to couple a free-space laser beam into an optical fiber. Each collimation package is factory aligned to provide diffraction-limited performance at one of six wavelengths: 405, 543, 633, 1064, 1310, or 1550 nm. Although it is possible to use the collimator at detuned wavelengths, they will only perform optimally at the design wavelength due to chromatic aberration, which causes the effective focal length of the spheric lens to have a wavelength dependence.

When the beam divergence angle was measured for the SF220SMA-A collimator a 460HP fiber was used with 543 nm light. The result was a divergence angle of 0.018�.

These packages can also be used to couple a free-space laser beam into an optical fiber. To obtain a high coupling efficiency, the NA of the patch cable needs to be greater than or equal to the NA of the collimator, and the diameter of the focused beam needs to be smaller than the MFD/core of the fiber. Please refer to the Specs tab for suggested mounting adapters.

For large beam diameters (�6.6 - �8.5 mm), we offer FC/PC, SMA, and FC/APC air-spaced doublet collimators. These collimation packages are pre-aligned at the factory to collimate a laser beam propagating from the tip of an FC or SMA conectorized fiber and provide diffraction-limited performance at the design wavelength.

These packages can be used to couple a free-space laser beam into an optical fiber. To obtain a high coupling efficiency, the NA of the patch cable needs to be greater than or equal to the NA of the collimator, and the diameter of the focused beam needs to be smaller than the MFD of the fiber. Please refer to the Specs tab for suggested mounting adapters.

These snap-on collimators are designed to connect onto the end of an FC/PC or FC/APC connector and contain an AR-coated aspheric lens. The distance between the aspheric lens and the tip of the FC-terminated fiber can be adjusted to compensate for focal length changes or to recollimate the beam at the wavelength and distance of interest.

We also offer a line of adjustable collimation packages called FiberPorts that are well suited for a wide range of wavelengths. These are ideal solutions for adjustable, compact fiber couplers. For other collimation and coupling options, please contact us.

We offer four gradient index (GRIN) fiber collimators that are aligned for either 1310 nm or 1550 nm and have either FC connectorized or unterminated fibers. Our GRIN collimators feature a �1.8 mm clear aperture, are AR-coated to ensure low back reflection into the fiber, and are coupled to standard Corning SMF-28 single mode fibers.

The SF220FC, SF230FC, SF240FC, SF260FC, SF280FC, and SF671FC Series of fiber collimation packages are pre-aligned to collimate a laser beam propagating from the tip of an FC/PC (2.1 mm wide key compatible) connectorized fiber with diffraction-limited performance. Because the F200-Series fiber collimators have no movable parts, they are compact and not susceptible to misalignment. Due to chromatic aberration, the effective focal length (EFL) of the aspheric lens is wavelength-dependent. As a result, these collimators will only perform optimally at the design wavelength. The aspheric lens is factory-aligned so that it is one focal length away from the fiber tip when inserted into the collimator. This distance is equal to the focal length of the aspheric lens at the design wavelength. In addition, the aspheric lens has an AR coating that minimizes surface reflections.