Filters

Mar 24, 2016.

List of Filters

(*1) Transmittance curve provided by the vendor.
(*2) Actual transmittance curve and related parameters (peak, λeff, etc.) are affected by reflectance decay of the dichroic mirror shorter than 550 nm (see Fig. 3).
(*3) Transmittance curve measured at room temperature (NAOJ ATC Optshop).
Band Arm λeff (nm) peak (%) Δλ(FWHM) (nm) λmin (Half maximum) (nm) λmax (Half maximum)(nm) Vendor Sysmtem Comments
B Opt 443.52 in prep. 101.74 391.68 493.42 Asahi Modified Johnson-Cousins (*1)(*2)
V Opt 549.14 in prep. 107.03 495.68 602.71 Asahi Modified Johnson-Cousins (*1)(*2)
RC Opt 653.44 in prep. 129.39 588.51 717.89 Asahi Modified Johnson-Cousins (*1)
IC Opt 808.79 in prep. 138.19 739.81 877.99 Asahi Modified Johnson-Cousins (*1)
Y Opt in prep. in prep. in prep. in prep. in prep. -- Original --
Y IRA in prep. in prep. in prep. in prep. in prep. BARR MKO --
J IRA 1248.5 89.4 159.3 1167.8 1327.1 BARR MKO (*3)
H IRA 1638.0 97.3 286.2 1494.0 1780.2 BARR MKO (*3)
Ks IRA 2145.5 93.3 319.5 1986.0 2306.4 BARR MKO (*3)
H2(v=2→1) IRA in prep. in prep. in prep. in prep. in prep. in prep. Original --

Transmittance Curve of optical filters
Fig 1: Transmittance curves of optical filters. Those of Johnson-Cousins system (reproduced by Bessel et al.; Ref1.; Ref2.) are also shown as comparison.

Transmittance Curve of IR filters
Fig. 2: Transmittance curves of IR filters.

Effective transmittance Curve modified by DM
Fig. 3: Effective transmittance curve of B and V filter multiplied by the dichiroic mirror reflectance.

Numerical Data of Transmittance Curve

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