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Fiber Optic Low Friction Rotary Joint for Optogenetics


* Patent Pending

Introduction


  The fiber optic Rotary Joint enables optogenetics experiments with live animals, allowing for the free movement of animal and fiber optic cables with a minimum of torque while maintaining excellent light transmission.

   High NA, large core polymer (POF) fibers of 1500um - 500um are coupled to Ultra High Power (UHP) LEDs at one end and attached to the Rotary Joint at the other.

  Small core fibers of 500um - 200um are coupled to the other side of the Rotary Joint, while connected to the free-moving animal during optogentics experiments.

  The concept of light delivery from thick to thin core fibers enables the use of several thin fibers simultaneously, for example to deliver light to separate areas of the brain simultaneously without loss of power.

             Rotary-Joint-fibers-cannulas-for-dual-hemisphere-activation


    
Fiber-Optic-Rotary-Joint




Rotary Joint PDF

Key Features:

  • Efficiently connects large core to small core fibers
  • Lightweight and small footprint
  • Ideal for coupling Prizmatix UHP-Mic-LEDs to optogenetics fibers
  • Fiber types:FC to FC
  • Stainless steel housing

Specifications:


 
Wavelength range nm 350 - 1100
Connector for optical fiber   FC - FC
Diametermm 18
Weightgram 10
Connection to other systems/supports   M2 thread
Typical additional optic loss(*)dB <0.5
Variation during rotationdB <0.2
*) Measured in 1000 um to 200um setup with rortary joint relative to fixed adaptor.

Additional information

   The Prizmatix Rotary Joint was especially designed for working with high NA fibers and LED light sources. Unlike Lasers, Prizmatix Ultra High Power LEDs have a high brightness and large light emitting area. This characteristic is used to couple the LED's light efficiently into a high numerical aperture (NA ≥ 0.5), large core fiber such as 1000um – 1500um core.

   Due to the wide aperture of this fiber, coupling a secondary fiber (NA ≥ 0.5) with smaller core, such as 500um, does not require precise axial alignment. Placing the small core in front of the larger core fiber enables efficient light coupling. The primary fiber is connected to the top port of the fiber optic Rotary Joint and the secondary fiber is connected to the lower half. The Rotary Joint contains special low-friction ball bearings which enables the two fibers to rotate freely upon each other.

   Although the core diameter of the fiber optic components are reduced, If the high NA (Numerical Aperture) is manintained the LED's brightness (usually measured in mW/mm2), is conserved along the fibe roptic path from the LED to the Rotary Joint, and eventually into the cannula.

   The large to small core coupling method allows for more than one secondary fiber to be attached using a single LED light source and without compromising the brightness. This is very useful for comprehensive research such as optogenetically manipulating two brain hemispheres or several locations simultaneously as on a picture above.

   Prizmatix Rotary Joint is a one element of Prizmatix's Optogenetics Toolbox, which offers accessories for Optogentic research: Optogenetics Toolbox



Mechanical Drawings

Rotary-Joint-Drawing
 

Optional Accessories

Ultra High Power LEDs (UHP-Mic-LEDs)

The UHP-Mic-LED is a Ultra High Power LED light source for fluorescence microscopy and other applications. The UHP-Mic-LED light source module is an effective replacement of spectral lamps and lasers in many applications. The LEd driver supports CW or external TTL modulation with user-controlled frequency and duty cycle. For more details please refer to Prizmatix special page

Filter Wheel

The UHP-Mic-LED can be equipped with a 6-position filter wheel at the beam output. This accessory is especially useful for UHP-Mic-LED-White light source. Please see video clip (starting at 1:58) for details http://www.youtube.com/watch?v=iv7dlwLHaUE?rel=0
For more details refer also to Prizmatix special page

Fiber Coupler Adaptor

Transform a Prizmatix microscope LED into a fiber coupled light source by adding a Fiber Coupler Adaptor (SMA. CF or ST connector) by simply screwing the adaptor into the front of the LED head See the Fiber Coupler in action in this video (starting at 1:18)
http://www.youtube.com/watch?v=iv7dlwLHaUE?rel=0

Liquid Light Guide Adaptor

A Prizmatix microscope-LED can be easily changed from direct microscope coupling to a liquid light guide coupled LED with the LLGA adaptor, which simply screws into the front of the LED as shown in this video (starting at 2:31)
http://www.youtube.com/watch?v=iv7dlwLHaUE?rel=0

Fiber Bundles

Prizmatix can configure and build custom fiber bundles for specific applications.For example: combining outputs of multiple LEDs into a Y-shaped fiber bundle with two or more input branches.
Further information can be found here



Overview of Prizmatix Microscope LEDs and Accessories



Optogenetic-toolkit
  1 Ultra High Power LED   2 Beam Combiner
  3 Fiber Coupling Adaptor   4 Fiberoptics
  5 Rotary Joint   6 Beam Switcher
  7 Filter Wheel   8 Microscope Adaptors
  9 Liquid Light Guide Adaptor 10 Liquid Light Guide
11 Liquid Light Guide XTZ Collimator 12 C-Mount Adaptor
13 Fiberoptic Collimator 14 Reference Photodiode
15 Single/Dual Fiber 16 Optogenetics Implantable Cannulae

© Prizmatix, Israel