A fiber IFU with 8064 fibers is designed and manufactured for the Fiber Arrayed Solar Optical Telescope. 8064 fibers are divided to two 2D arrays for different polarization states and 12 pseudo fiber slits for 12 spectrometers. There are many relative techniques have been developed during this process. The hexagon microlens array fits the 100% filling factor. The quartz micropores plate guarantee the positioning accuracy among different temperatures. The 18m fiber cables with special designs transfer the signal with low focal ratio degradation. The quartz V-grooves are used to control the positions of the fibers to form those pseudo slits. Besides, a six-dimensional alignment system and a fast alignment and detection system are built to align the microlens array with micropores and measure the focal ratio, transmission efficiency and alignment accuracy of the IFU, respectively.
The optical-fiber-based Integral Field Unit (IFU) is a very important device for astronomical observation. The IFU can obtain higher spatial resolution and good transmission efficiency. In this paper, a small IFU with 242 fibers was built for the prototype of the Fiber Arrayed Solar Optical Telescope (FASOT). It adopts the method of “micro lens + fiber array”. We designed the fiber with the core diameter of 35μm and NA 0.12. Two quartz positioning plates with micro pores were chosen to localize these fibers. And the micro lens was designed according to the parameter requirement. The coupling efficiency and the focal ratio between the micro lenses array and the fiber array are analyzed when position mismatch. The angular error is the main effect to influence the coupling efficiency.
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