Reflective Collimators, Protected Silver Coating
|Item # Prefix||RC02||RC04||RC08||RC12|
(0.13 NA Fiber)
|Ø2 mm||Ø4 mm||Ø8.5 mm||Ø12 mm|
|Numerical Aperture (NA)||0.40||0.36||0.167||0.216|
|Effective Focal Length (EFL)||7 mm||15 mm||33 mm||50.8 mm|
|External Threaded Housing|| SM05 (0.535"-40)||SM1 (1.035"-40)|
|Clear Aperture||Ø7.5 mm||Ø11 mm||Ø22 mm|
|Reflectance (Avg)||>97.5% (450 nm - 2 μm)|
>96% (2 - 20 μm)
Please see the Specs Tab for more information
Click to Enlarge
The left image shows the RC02 mounted into a KM05
Ø1/2" kinematic mount. The right image shows the RC02 mounted into a KM100
Ø1" kinematic mount.
- Achromatic Design for Nearly Gaussian Collimation Over the Mirror's Reflection Band
- Protected Silver Coating (450 nm - 20 µm) Offers High Reflection
- Great for Coupling Polychromatic Light into Multimode Fiber
- Ø7.5 mm, Ø11 mm, or Ø22 mm Clear Aperture
- Nonmagnetic Stainless Steel Housing
These Protected Silver Reflective Collimators are based on a 90° off-axis parabolic mirror. Metallic mirrors, unlike lenses, have a focal length that remains constant over a broad wavelength range. Due to this intrinsic property, a parabolic mirror collimator does not need to be adjusted to accommodate various wavelengths of light, making them ideal for use with polychromatic light. The limitations of the achievable surface roughness of the diamond turning process and tooling marks will cause a minimal (~2% @ 633 nm) amount of scattering off of the mirrored surface.
The RC02, RC04, and RC08 reflective collimator housings are equipped with external SM05 (0.535"-40) threads while the RC12 collimator housing has external SM1 (1.035"-40) threads. Thus, these mounts are directly compatible with our SM05- or SM1-threaded optomechanics such as the LMR05 or LMR1, respectively. The back of the RC02 collimators are machined down to Ø1/2", enabling direct mounting into a Ø1/2" kinematic mount (see image to the right). Furthermore, the RC02 may be directly mounted to Ø1" kinematic mounts as shown in the image to the right.
These Protected Silver Reflective Collimators offer excellent reflectivity within the 450 nm - 20 µm wavelength range. Please see the Specs tab for more information. Common applications include systems that utilize multiple wavelengths that need to be collimated, collimation/coupling in the IR, and coupling polychromatic light into large-core multimode fiber.
Note that light cannot be well collimated from a multimode fiber. However, if you are attempting to collimate light from multimode fiber, the Numerical Aperture (NA) of the fiber should be <0.40 (RC02), <0.36 (RC04), <0.167 (RC08), or <0.216 (RC12) to avoid the collimator housing from clipping light emitted from the fiber tip. As the core size of the fiber gets larger, the resulting minimum divergence angle will increase as well, thus yielding an output that cannot be well-collimated.
Thorlabs also offers a line of UV-Enhanced Aluminum Coating Reflective Collimators for the 250-450 nm wavelength range.
Reflective collimators create a collimated beam that is proportional to the NA of the fiber you are using. To approximate this, use the following equation:
Output Diameter = 2 x NA (Fiber) x EFL
Depending on how the NA of the fiber is specified, the above equation gives the 5% level or 1% level (not the 1/e2 value).
Fiber Patch Cables for Reflective Collimators
Thorlabs offers single mode, polarization-maintaining, or multimode fiber optic patch cables for both coupling and collimating applications. We also have Low-Insertion-Loss Patch Cables, which feature handpicked single mode fiber with tighter core concentricity specifications for lower insertion loss and higher transmission. If you cannot find the appropriate stock patch cable for your application, custom-connectorized patch cables with same-day shipping are also available.
|Wavelength Range||450 nm - 20 µm|
|Reflectance (Avg)||>97.5% (0.45 - 2 µm)|
>96% (2 - 20 µm)
|Surface Quality||40-20 Scratch-Dig|
|Surface Roughness||<100 Å RMS|
|Full Angle Beam Divergencea||0.02°|
(FC/PC- and FC/APC-Connectorized Models)
|Item #||Fiber Connectora||Clear Aperture||Beam Diameterb||Mirror NA||EFLc||PFLd|
|RC02FC-P01||FC/PC||Ø7.5 mm||2 mm||0.40||7 mm||3.5 mm|
|RC04FC-P01||Ø11 mm||4 mm||0.36||15 mm||7.5 mm|
|RC08FC-P01||Ø11 mm||8.5 mm||0.167||33 mm||16.5 mm|
|RC12FC-P01||Ø22 mm||12 mm||0.216||50.8 mm||25.4 mm|
|RC02APC-P01||FC/APC||Ø7.5 mm||2 mm||0.40||7 mm||3.5 mm|
|RC04APC-P01||Ø11 mm||4 mm||0.36||15 mm||7.5 mm|
|RC08APC-P01||Ø11 mm||8.5 mm||0.167||33 mm||16.5 mm|
|RC12APC-P01||Ø22 mm||12 mm||0.216||50.8 mm||25.4 mm|
|RC02SMA-P01||SMA||Ø7.5 mm||2 mm||0.40||7 mm||3.5 mm|
|RC04SMA-P01||Ø11 mm||4 mm||0.36||15 mm||7.5 mm|
|RC08SMA-P01||Ø11 mm||8.5 mm||0.167||33 mm||16.5 mm|
|RC12SMA-P01||Ø22 mm||12 mm||0.216||50.8 mm||25.4 mm|
Fiber Collimator Selection Guide
Click on the collimator type or photo to view more information about each type of collimator.
|Fixed FC, APC, or SMA Fiber Collimators||These fiber collimation packages are pre-aligned to collimate light from an FC/PC-, FC/APC-, or SMA-connectorized fiber. Each collimation package is factory aligned to provide diffraction-limited performance at one of six wavelengths: 405, 543, 633, 780, 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.|
|Air-Spaced Doublet, Large Beam Collimators||For large beam diameters (Ø6.6 - Ø8.5 mm), Thorlabs offers 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 connectorized 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. |
|FiberPorts||These 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 or achromatic lens is available with three different AR coatings and has five degrees of alignment adjustment (3 translational and 2 pitch). The compact size and long-term alignment stability make the FiberPort an ideal solution for fiber coupling, collimation, or incorporation into OEM systems.|
|Triplet Collimators||Thorlabs' High Quality Triplet Fiber Collimation packages use air-spaced triplet lenses that offer superior beam quality performance when compared to aspheric lens collimators. The benefits of the low-aberration triplet design include an M2 term closer to 1 (Gaussian), less divergence, and less wavefront error. |
|Reflective Collimators||Thorlabs' metallic-coated Reflective Collimators are based on a 90° off-axis parabolic mirror. Mirrors, unlike lenses, have a focal length that remains constant over a broad wavelength range. Due to this intrinsic property, a parabolic mirror collimator does not need to be adjusted to accommodate various wavelengths of light, making them ideal for use with polychromatic light. Our reflective collimators are ideal for single-mode fiber.|
|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 six wavelengths: 532, 830, 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||Thorlabs offers gradient index (GRIN) fiber collimators that are aligned for either 980, 1064, 1310, or 1550 nm and have either FC connectorized, APC connectorized, or unterminated fibers. Our GRIN collimators feature a Ø1.8 mm clear aperture, are AR-coated to ensure low back reflection into the fiber, and are coupled to standard single mode or graded-index multimode fibers.|
|GRIN Lenses||These graded-index (GRIN) lenses are AR coated for applications at 630, 830, 1060, 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. Our GRIN lenses are designed to be used with our Pigtailed Glass Ferrules and GRIN/Ferrule sleeves.|