Performance of Fibers in IFU

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Presentation transcript:

Performance of Fibers in IFU 2.4m Telescope Group Yunnan Observatory of CAS Performance of Fibers in IFU Chang, Liang LIA Origins IFU Workshop@Lijiang 11-10-2010

Yunnan Observatory of CAS 2.4m Telescope Group Yunnan Observatory of CAS Main Missions 1. Focal Ratio Degradation 2. Scrambling Properties LiJET FASOT ? IFU on 2.4m telescope ?

Yunnan Observatory of CAS 2.4m Telescope Group Yunnan Observatory of CAS Gerardo Avila-----ESO Focal Ratio Degradation (FRD) Why??? The main reasons: The high sensibility of the fibers to any mechanical constraints The preparation of the fiber ends and the optical alignment errors How???

Yunnan Observatory of CAS 2.4m Telescope Group Yunnan Observatory of CAS

Yunnan Observatory of CAS 2.4m Telescope Group Yunnan Observatory of CAS

Yunnan Observatory of CAS 2.4m Telescope Group Yunnan Observatory of CAS

FRD of LIJET Fibers 2.4m Telescope Group Yunnan Observatory of CAS ①Laser ②Objective③lens1 ④Iris ⑤Lens2 ⑥Fiber ⑦Iris2 ⑧Lens 3 ⑨Power meter Total Transmission F/4 output Transmission F/4 FRD 105um 405nm 53.67% 51.94% 96.77% 543.5nm 94.75% 90.53% 95.54% 632.8nm 95.27% 94.18% 98.85% 50um 44.59% 41.16% 92.3% 86.73% 86.21% 99.4% 92.51% 91.94% 98.95%

Yunnan Observatory of CAS PSF Position and profile changed on CCD 2.4m Telescope Group Yunnan Observatory of CAS 2. Scrambling Properties What’s: When we use fiber to connect telescope and spectrographs, our requirement imposes position stability along the dispersion of the monochromatic image of the fiber (PSF) The position errors of barycenter of the PSF are mainly produced by the stability of telescope guiding system and seeing Position of the star in front of the fiber is not constant PSF Position and profile changed on CCD Optical fiber are not perfect image scramblers, indeed, the information of position of star in front of a fiber is not totally lost at output end, The light on fiber surface is not evenly distributed

Yunnan Observatory of CAS 2.4m Telescope Group Yunnan Observatory of CAS How Increase Scrambling Properties of Fibers Optical methods and mechanical methods

Yunnan Observatory of CAS 2.4m Telescope Group Yunnan Observatory of CAS

Yunnan Observatory of CAS 2.4m Telescope Group Yunnan Observatory of CAS Mechanical Methods Pressure, Bending, twists, shake, freeze??

Yunnan Observatory of CAS 2.4m Telescope Group Yunnan Observatory of CAS The End Thanks