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Optical parameters obtained by echelle simulator

The optical parameters of the echelle spectrograph are adjusted by comparing a real spectral format with a simulated one. Table 3 shows the several parameters.


Table 3: Optical parameters of the IRCS echelle spectrograph
Telescope  
Focal length ($ f_{tel}$; mm) 100040  
Aperture ($ D_{tel}$; mm) 8082  
Plate Scale (arcsec mm$ ^{-1}$) 2.062  
Collimator  
Focal length ($ f_{col}$; mm) 300.00 [320.248]
Aperture ($ D_{col}$; mm) 25.882  
Camera  
Focal length ($ f_{cam}$; mm) 318.0 [315.386]
Aperture ($ D_{cam}$; mm) 34.327  
Detector  
Type Raytheon InSb Array  
Multiplexer Aladdin II  
Pixel size (mm pix$ ^{-1}$) 0.027  
Echelle grating  
Groove spacing ($ \sigma_e$; mm) 1.0/31.6  
Groove Angle ($ \theta_Be$; degree) 63.5 [63.52]
Grating operating angle( $ (\alpha - \beta)_{e0}$; degree) 8.0  
Cross-Disperser  
Groove spacing ($ \sigma_c$; mm) 1.0 / 42.5 [1.0/42.35]
Groove Angle ($ \theta_Bc$; degree) 8.016  
Grating operating angle( $ (\alpha - \beta)_{c0}$; degree) 31.34498  

* The values in [ ] are original optical design values of IRCS (Warren, 1996).



Tae-Soo Pyo
2003-05-29