UBVRcIc filters

Though UBVRI photometric system is rather classical in modern astronomy， UBVRcIc filters are still fundamental and important for telescopes. Asahi provides UBVRcIc filters made by specified colored glass combination under the suggestion of Prof. Mike Bessell， RSAA. We will also improve the transmission of conventional UBVRcIc filters by using interference films with the similar slopes in the future. otice: We currently produce B filter by L-38 (HOYA) and BG25 (Schott) instead of GG385 and BG12 (both Schott) because they areo longer available.

arrow bandpass filters

arrow bandpass filters for H-alpha， SII or OIII emission line have been fundamental and important for astronomical sciences. arrow bandpass filters to target a redshift survey for H-alpha emitting galaxies are gettingecessary for science groups. More rectangular passband， precise center wavelength and FWHM， high transmission of filter are essential for H-alpha galaxy survey. Asahi provided large format 250mm x 165mm redshifted H-alpha filters with good uniformity and monolithic substrate to Palomar Transient Factory. We are currently interested in having the opportunity to produce largearrow bandpass filters for DECam or ODI in the future.

Large filters forext-generation wide field camera

ext-generation wide field camera such as Dark Energy Camera (DECam) ， Hyper Suprime-Cam (HSC)， One Degree Imager (ODI)， LSST， Pan-STARRS or Discovery Channel Telescope (DCT)ow comes of age. Large filters that can satisfy these cameras should have excellent coating uniformity over the clear aperture and also high transmission i passband to shorten the exposure time as much as possible. Asahi produced the largest ever 620mm DES g， r， i， z， y filters for Dark Energy Survey， and 600mm HSC g， Y filters for Subaru Telescope by our proprietary large magnetron sputtering coater in 2011-2012. Furthermore， we succeeded in coating the largest and hardest 620mm DECam u filter that had high transmission at any locations in spite of UV wavelength in 2012. ew DECam VR filter with broad passband was successfully coated by Asahi in 2014. It was already delivered to CTIO and installed in DECam， Blanco Telescope.

Asahi past experiences to provide large filters

DES 620mm diameter g， r， i， z， y filters (2011-2012)

DECam 620mm diameter u filter (2012)

DECam 620mm diameter VR filter (2014)

HSC 600mm diameter g， Y filters (2012)

MegaCam 350mm x 300mm u filter (2014)

OGLE 310mm x 310mm V， R filters (2009)

KMTNet 310mm x 310mm B， V， Rc， Ic， g， i filters (2012)

Megacam 300mm x 300mm g + r filter (2013)

Megacam 300mm x 300mm mosaicarrow bandpass filter (2009)

Binospec 292.1mm x 209.55mm g， r， i， z filters (2013)

Binospec 292.1mm x 209.55mm long pass filter (2014)

PAU 208.8mm x 203.4mm u， g， r， i， z， y filters (2013)

SALT HRS 350mm x 40mm dichroic mirror (2010)

PTF 250mm x 165mm SDSS g，arrow bandpass filters (2011)

Suprime-Cam 205mm x 170mm B， V， R， I， u， r， z and manyarrow bandpass filters (1997-2012)

Broadband AR coating

AR coating is quite basic and essential technology for any astronomical instruments， because the performance determines the available wavelength in cameras or spectrographs. The AR film that can cover the unprecedented broadband is currently getting important to build theext-generation spectrograph. Broadband AR coating also contributes to reduce the ghost caused by multiple reflection on dichroic beam splitter. Asahi succeeded in developing the incredible broadband AR coating which covers from 380nm to 1800nm.

SDSS u， g， r， i， z-band filters

Mauna Kea Observatories Y， J， H， Ks filters

Unlike optical filters in astronomy， there are much harder requirements for astronomical IR filters. HdCdTe imaging sensor requires IR filters to have very broad blocking range from 0.4m to 2.7m， sometimes beyond 3m. Also vacuum and cryogenic environment requires to be made by monolithic substrate. Eventually huge layers of thick interference films areecessary to achieve both requirements. Mauna Kea Observatories (MKO) Y， J， H and Ks filter specifications were defined by Dr. Alan Tokunaga， University of Hawaii. MKO filters are currently standard photometric system inIR region as SDSS u， g， r， i and z-band filters in optical region. We produce Y， J， H， Ks filters by magnetron sputtering and ion assisted deposition technology with single substrate on the basis of MKO filter specifications， and measure the transmission curve under 77K cryogenic condition by ourselves.

Dichroic mirror

努美（北京）科技有限公司 QQ：--- Tel： Fax： -521821 Email：info@nmerry.com Web：www.nmerry.com

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