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Fiber Launch Systems: Professional Solutions
FC Fiber to GRIN Lens
Microscope Objectives and
US Patents 6,186,016 and 6,467,762
NanoMax Parallel Flexure Stages
X, Y, and Z Axes are Decoupled to Maximize Stablility During Adjustment
When considering a fiber launch system, the use of nested flexure plates in place of more traditional linear bearings provides a number of advantages. First, nearly perfect, smooth, continuous motion is achievable with a flexure mechanism. Second, a flexure mechanism eliminates the need for lubricants within the stage structure. With traditional bearings, minor imperfections in the bearing or contaminants trapped in the lubricant create localized rough spots where the displacement resolution degrades significantly. The lack of lubricants also minimizes stage creep.
Easy Alignment of Accessories
In addition, adapter plates are available to mount the NanoMax series stages to a wide range of other Thorlabs rotation and long travel linear stages.
Combined, these features make the MAX300D series flexure stages solid platforms for alignment applications that require high stability and repeatability.
Arcuate Cross Talk Specifications
The table below shows the theoretical amount of cross talk to the Z axis, when a movement is demanded at various X positions (Y axis at zero).
The table below shows the typical amount of cross talk to the X axis, when a movement is demanded at various Z axis positions (Y axis at zero).
MAX373D Piezo Stage Specifications
Choosing the correct lens or objective for launching light into a fiber depends on several factors, such as the input wavelength, beam diameter, and the mode field diameter (MFD) of the fiber. The focal length or effective focal length required to optimize coupling can be estimated using the relationship below. For specific lens and objective recommendations, please contact Technical Support.
As an example calculation, the P1-630A-FC-2 FC/PC single mode patch cable, which incorporates SM600 fiber, has an 1/e2 mode field diameter (MFD) of 4.3 μm at 633 nm. The MFD should equal the diffraction-limited spot size Øspot, which is given by the following equation:
Here, f is the focal length of the lens or effective focal length of an objective, λ is the wavelength of the input light, and D is the 1/e2 diameter of collimated beam incident on the lens.
Lenses or objectives can be used to launch light into an optical fiber. The clear aperture must be larger than the input beam diameter. For optimum coupling, the spot size of the focused beam must be less than the MFD of the single mode fiber. As a result, if a lens or objective is not available that provides an exact match, then choose an optic with a focal length that is shorter than what the calculation above yields. Alternatively, if the clear aperture is large enough, the beam can be expanded before the lens or objective, which effectively reduces the spot size of the focused beam.
The MAX350D Fiber Launch System for Bare Single Mode Fiber features our high-resolution differential adjusters, which are ideal for optimizing the coupling of a free-space laser into a single mode fiber. It is capable of fiber coupling even in the visible spectrum where the mode field diameter of fiber may be as small as 3 µm. The quick-release fiber holder provides six mounting surfaces, each one designed to accept a different size fiber. The addition of a cable strain relief helps to prevent inadvertent disruption of the system. This preconfigured system is an ideal starter system, which can be quickly adapted to many uses through the use of additional flexure stage accessories.
The MAX355D Fiber Launch System for FC/PC-connectorized fibers features our high-resolution differential adjusters. This version of our fiber launch system features a holder for a GRIN lens (not included). The addition of a cable strain relief helps to prevent inadvertent disruption of the system. This preconfigured system is an ideal starter system, which can be quickly adapted to many uses through the use of additional flexure stage accessories.
The MAX361D fiber launch system, which is designed for use with bare PM fiber, is configured from our highest performing flexure stage and three of our high resolution dual stage micrometers. This combination provides both the resolution and the stability required to achieve true sub-micron positional control.
The HFR007 fiber rotator included in this package features an engraved dial with 5° increment graduations. In addition, the quick-release fiber clamp allows quick and easy top loading of the fiber. The HFR007 provides the added degree of rotational freedom that is required to optimize the extinction ratio of a PM fiber. This preconfigured system is an ideal starter system, which can be quickly adapted through the use of additional flexure stage accessories.
The MAX373D launch system features our high resolution differential adjusters, which are ideal for optimizing the coupling of a free space laser into a single mode fiber, even in the visible spectrum where the mode field diameter of the fibers are as small as 3 µm. The quick-release fiber holder provides six mounting surfaces, each one designed to accept a different size fiber. The addition of a cable strain relief helps to prevent inadvertent disruption of the system, a small feature that can be a great time saver. This preconfigured system is an ideal starter system that can be quickly adapted to many uses.
Auto Alignment Using Internal Closed-Loop Piezoelectric Actuators
Fiber Alignment Bundles
For applications where auto alignment is not required, the piezo actuators in the stage could be controlled by our BPC30x Benchtop Piezo Controllers.
Please note that the piezo mechanism uses contact with the micrometer drives in order to move the top platform. If for any reason the stage is operated with the micrometer drives removed, blanking plugs must be fitted before the piezo actuators can function. To order blanking plugs, please contact Tech Support.