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天文二向色分束器ASAHI SPECTRA

简要描述:天文二向色分束器ASAHI SPECTRA
开发的真空沉积技术,如离子辅助沉积(IAD),离子束溅射(IBS),实现硬涂层的环境(湿度,低或高的温度,热冲击或真空)的优良的耐用性和稳定性光谱性能。

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  • 厂商性质:生产厂家
  • 更新时间:2018-05-17
  • 访  问  量:217
详细介绍

天文二向色分束器ASAHI SPECTRA Dichroic beam splitters

Dichroic beam splitters are getting more important for state-of-the-art spectro-graphs such as Dark Energy Spectroscopic
Instrument (DESI), Prime Focus Spectrograph (PFS), or multi-channel CCD cameras to take images in different colours simultaneously.

Dichroic beam splitters split the incident beam to two directions, therefore give the influence to the performance of at least
two or more cameras in terms of wavefront error, throughput, and available wavelength range.

 

天文二向色分束器ASAHI SPECTRA
Essential requirements for astronomical dichroic beam splitters are as follows.

  • High reflection in (broad) band
  • High transmission in (broad) band
    Both contribute the high overall throughput of the instrument.
  • Sharp transition from reflection to transmission
    It contributes to minimize unavailable wavelength range.
    Key technique is to reduce the separation of p and s-polarization
    at specified angle of incidence.
  • Minimized reflected wavefront error *after coating*
  • Minimized transmitted wavefront error *after coating*
    Both contribute the image quality of the instrument.​

There are few vendors in the world that can achieve all the requirements, a~e at the same time.
Asahi is one of potential vendors to provide such dichroic beam splitters with these performances.

We were successful in the fabrication of 390 mm x 365 mm, largest ever astronomical dichroic beam splitter for PFS in 2015.
The dichroic met all the hard specifications required by PFS project.

 

曲线

 

 


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