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2 September 2008 Broadband white light laser combiner system
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The SIM-Planetquest (Space Interferometry Mission), currently under development at the Jet Propulsion Laboratory, consists of two 6-meter baseline interferometers on a flexible truss. SIM's science goals require 1μas accuracy in its astrometric measurements[1]. To achieve this level of accuracy for detecting planets SIM built the Spectrum Calibration Development Unit (SCDU) testbed. The testbed requires a white light point source with broadband spectrum. Before each long test the spectrum on the camera must be calibrated. To achieve this task a laser light visible to camera was coupled to the white light source. The light system needed pointing stability of better than 4 micro-radians and a minimum optical power level at the fringe tracking camera. Due to stability requirement of the experiment, the setup, including the point source is in a vacuum chamber. To get a broadband spectrum point source inside the vacuum chamber white light from a multimode fiber was combined with laser light in free space to a photonics crystal fiber (PCF). The output is a single mode, broadband, and Gaussian beam. This paper explains the details of such a design and shows some of the results.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel Ryan, Alireza Azizi, Xin An, Hong Tang, and Richard Demers "Broadband white light laser combiner system", Proc. SPIE 7056, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications II, 705623 (2 September 2008);

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