================================================== DFOSC grism #3; low resolution blue grism 0 Prism glas........................ LF5 1 Resin............................. regular 2 Grism wavelength in min order (nm) 430.0000 3 Groove frequency.................. 400.0000 4 Groove angle...................... 15.0000 5 Best illumination angle of grating -3.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 1.0000 14 No of orders...................... 1.0000 Grism angle.......................... 16.5768 Prism index at grism wavelength...... 1.6008 Resin index at grism wavelength...... 1.6046 Best prism index..................... 1.6498 Dispersion........................... 168.3421 0-order angle with horizontal........ -10.2506 0-order position on detector......... -1760.1719 Blaze angle in lowest order.......... -1.0176 Blaze position on detector........... -172.8932 Blaze wavelength (nm)................ 391.6614 Anamorphic magnification............. 0.9886 RS product........................... 689.0055 Angle of incidence on facet.......... -2.1983 ================================================== DFOSC grism #4; low resolution visual grism 0 Prism glas........................ LF5 1 Resin............................. regular 2 Grism wavelength in min order (nm) 580.0000 3 Groove frequency.................. 300.0000 4 Groove angle...................... 14.6000 5 Best illumination angle of grating -3.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 1.0000 14 No of orders...................... 1.0000 Grism angle.......................... 17.3336 Prism index at grism wavelength...... 1.5820 Resin index at grism wavelength...... 1.5902 Best prism index..................... 1.6988 Dispersion........................... 223.8972 0-order angle with horizontal........ -10.4142 0-order position on detector......... -1788.8889 Blaze angle in lowest order.......... -1.5887 Blaze position on detector........... -269.9540 Blaze wavelength (nm)................ 496.0237 Anamorphic magnification............. 0.9883 RS product........................... 698.9680 Angle of incidence on facet.......... -1.1259 ========================================================= DFOSC grism #5; low resolution red grism, the 2. order is effectively cut away by a thin disc of OG515 glued on the front of the grism 0 Prism glas........................ BK7 + OG515 1 Resin............................. regular 2 Grism wavelength in min order (nm) 700.0000 3 Groove frequency.................. 300.0000 4 Groove angle...................... 22.0000 5 Best illumination angle of grating -3.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 1.0000 14 No of orders...................... 1.0000 Grism angle.......................... 24.0682 Prism index at grism wavelength...... 1.5131 Resin index at grism wavelength...... 1.5826 Best prism index..................... 1.5191 Dispersion........................... 217.0565 0-order angle with horizontal........ -13.2740 0-order position on detector......... -2296.2048 Blaze angle in min order............. 0.5369 Blaze position on detector........... 91.2168 Blaze wavelength (nm)................ 728.9024 Anamorphic magnification............. 0.9848 RS product........................... 873.2755 Angle of incidence on facet.......... -2.8123 =================================================== DFOSC grism #6; intermediate resolution blue grism 0 Prism glas........................ LF5 1 Resin............................. regular 2 Grism wavelength in min order (nm) 400.0000 3 Groove frequency.................. 600.0000 4 Groove angle...................... 22.0000 5 Best illumination angle of grating -4.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 1.0000 14 No of orders...................... 1.0000 Grism angle.......................... 23.1698 Prism index at grism wavelength...... 1.6079 Resin index at grism wavelength...... 1.6087 Best prism index..................... 1.6708 Dispersion........................... 109.0859 0-order angle with horizontal........ -15.1880 0-order position on detector......... -2642.2961 Blaze angle in lowest order.......... -0.8136 Blaze position on detector........... -138.2301 Blaze wavelength (nm)................ 380.6349 Anamorphic magnification............. 0.9837 RS product........................... 993.9802 Angle of incidence on facet.......... -2.5680 ================================================== DFOSC grism #7; intermediate resolution visual grism 0 Prism glas........................ LaK8 1 Resin............................. regular 2 Grism wavelength in min order (nm) 525.0000 3 Groove frequency.................. 600.0000 4 Groove angle...................... 34.0000 5 Best illumination angle of grating -13.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 1.0000 14 No of orders...................... 1.0000 Grism angle.......................... 25.9310 Prism index at grism wavelength...... 1.7181 Resin index at grism wavelength...... 1.5948 Best prism index..................... 1.8825 Dispersion........................... 107.3384 0-order angle with horizontal........ -21.0560 0-order position on detector......... -3747.2039 Blaze angle in lowest order.......... 1.6326 Blaze position on detector........... 277.4167 Blaze wavelength (nm)................ 567.5714 Anamorphic magnification............. 0.9797 RS product........................... 1331.3237 Angle of incidence on facet.......... -9.7156 ========================================================= DFOSC grism #8; intermediate resolution red grism, the 2. order is effectively cut away by a thin disc of OG515 glued on the front of the grism 0 Prism glas........................ F8 + OG515 1 Resin............................. regular 2 Grism wavelength in min order (nm) 700.0000 3 Groove frequency.................. 600.0000 4 Groove angle...................... 54.0000 5 Best illumination angle of grating -14.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 1.0000 14 No of orders...................... 1.0000 Grism angle.......................... 45.3021 Prism index at grism wavelength...... 1.5888 Resin index at grism wavelength...... 1.5826 Best prism index..................... 1.6176 Dispersion........................... 88.3729 0-order angle with horizontal........ 39.3021 0-order position on detector......... 7967.2422 Blaze angle in lowest order.......... 5.1839 Blaze position on detector........... 883.0414 Blaze wavelength (nm)................ 816.0905 Anamorphic magnification............. 0.9645 RS product........................... 2189.9556 Angle of incidence on facet.......... -12.2706 ================================================== DFOSC grism #10; very low resolution blue grism good cross disperser for an echelle 0 Prism glas........................ UBK7 1 Resin............................. regular 2 Grism wavelength in min order (nm) 390.0000 3 Groove frequency.................. 150.0000 4 Groove angle...................... 5.4000 5 Best illumination angle of grating -3.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 800.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 1.0000 14 No of orders...................... 1.0000 Grism angle.......................... 6.2880 Prism index at grism wavelength...... 1.5322 Resin index at grism wavelength...... 1.6104 Best prism index..................... 1.5139 Dispersion........................... 456.6586 0-order angle with horizontal........ -3.3543 0-order position on detector......... -570.4684 Blaze angle in lowest order.......... -0.0549 Blaze position on detector........... -9.3336 Blaze wavelength (nm)................ 383.8585 Anamorphic magnification............. 0.9960 RS product........................... 228.6522 Angle of incidence on facet.......... -3.1392 ================================================== DFOSC grism #11; very low resolution visual grism good cross disperser for an echelle The prism is made of GG385, to cut out the 2. order 0 Prism glas........................ LF5 (equivalate GG385) 1 Resin............................. regular 2 Grism wavelength in min order (nm) 500.0000 3 Groove frequency.................. 200.0000 4 Groove angle...................... 10.0000 5 Best illumination angle of grating -3.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 1000.0000 12 No of pts on detector............. 21.0000 13 Min order......................... 1.0000 14 No of orders...................... 1.0000 Grism angle.......................... 9.7296 Prism index at grism wavelength...... 1.5897 Resin index at grism wavelength...... 1.5971 Best prism index..................... 1.5024 Dispersion........................... 341.7597 0-order angle with horizontal........ -5.7704 0-order position on detector......... -983.5982 Blaze angle in lowest order.......... 0.2502 Blaze position on detector........... 42.4971 Blaze wavelength (nm)................ 520.5679 Anamorphic magnification............. 0.9934 RS product........................... 392.7176 Angle of incidence on facet.......... -4.0685 ================================================== DFOSC grism #12; very low resolution red grism good cross disperser for an echelle The prism is made of OG515 to cut out the 2. order 0 Prism glas........................ PSK3 (equivalate OG515) 1 Resin............................. regular 2 Grism wavelength in min order (nm) 700.0000 3 Groove frequency.................. 75.0000 4 Groove angle...................... 5.4000 5 Best illumination angle of grating -3.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 1000.0000 12 No of pts on detector............. 21.0000 13 Min order......................... 1.0000 14 No of orders...................... 1.0000 Grism angle.......................... 5.4751 Prism index at grism wavelength...... 1.5483 Resin index at grism wavelength...... 1.5826 Best prism index..................... 1.4419 Dispersion........................... 913.3627 0-order angle with horizontal........ -3.0088 0-order position on detector......... -511.6039 Blaze angle in lowest order.......... 0.1461 Blaze position on detector........... 24.8121 Blaze wavelength (nm)................ 733.6484 Anamorphic magnification............. 0.9965 RS product........................... 205.0969 Angle of incidence on facet.......... -3.8308 =================================================== DFOSC grism #9 - Echelle grism. Must be used in connection with a cross disperser to separate the orders; or with a filter which cuts out one single order 0 Prism glas........................ LF5 1 Resin............................. regular 2 Grism wavelength in min order (nm) 459.9000 3 Groove frequency.................. 79.0000 4 Groove angle...................... 63.5000 5 Best illumination angle of grating -7.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 6.0000 14 No of orders...................... 18.0000 Grism angle.......................... 65.8220 Prism index at grism wavelength...... 1.5953 Resin index at grism wavelength...... 1.6012 Best prism index..................... 1.6392 Dispersion........................... 25.8892 0-order angle with horizontal........ 59.8220 0-order position on detector......... 16738.3066 Blaze angle in min order............. -0.7810 Blaze position on detector........... -132.6796 Blaze wavelength (nm)................ 454.8292 Anamorphic magnification............. 0.9289 RS product........................... 5099.8135 Angle of incidence on facet.......... -1.8293 =================================================== DFOSC grism #13 - Echelle grism. Must be used in connection with a cross disperser to separate the orders; or with a filter which cuts out one single order For this echelle grism a special filter has been designed to cut out the 3rd order 0 Prism glas........................ BaK2 1 Resin............................. regular 2 Grism wavelength in min order (nm) 773.8000 3 Groove frequency.................. 316.0000 4 Groove angle...................... 63.5000 5 Best illumination angle of grating -7.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 2.0000 14 No of orders...................... 4.0000 Grism angle.......................... 65.8727 Prism index at grism wavelength...... 1.5339 Resin index at grism wavelength...... 1.5796 Best prism index..................... 1.5525 Dispersion........................... 54.4502 0-order angle with horizontal........ 59.8727 0-order position on detector......... 16772.4863 Blaze angle in lowest order.......... 3.5989 Blaze position on detector........... 612.1845 Blaze wavelength (nm)................ 824.8449 Anamorphic magnification............. 0.9338 RS product........................... 4058.4465 Angle of incidence on facet.......... -4.5005 =================================================== DFOSC14 - a design based on the FORS1 grism (The VLT FORS spectrograph). The grism can be compared with DFOSC6: The dispersion higher, the wavelength coverage larger and in the UV at 330nm the transmission is higher than for DFOSC6. The grism has be produced for DFOSC, ALFOSC, IFOSC and HFOSC 0 Prism glas........................ FK5 1 Resin............................. UVres 2 Grism wavelength in min order (nm) 463.0000 3 Groove frequency.................. 600.0000 4 Groove angle...................... 28.7000 5 Best illumination angle of grating -7.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 1.0000 14 No of orders...................... 2.0000 Grism angle.......................... 34.0910 Prism index at grism wavelength...... 1.4938 Resin index at grism wavelength...... 1.5322 Best prism index..................... 1.7161 Dispersion........................... 94.4295 0-order angle with horizontal........ -20.3846 0-order position on detector......... -3616.8108 Blaze angle in min order............. -1.4438 Blaze position on detector........... -245.3302 Blaze wavelength (nm)................ 428.7765 Anamorphic magnification............. 0.9779 RS product........................... 1337.0045 Angle of incidence on facet.......... 0.5493 ================================================== DFOSC15 - a design based on the FORS5 grism (The VLT FORS spectrograph). The grism can be compared with DFOSC4: The dispersion, the wavelength coverage, and the transmission is about the same. The grism was designed to go somewhat bluer that is actually the case (the grism was designed to have a wavelength coverage and transmission intermediate between DFOSC3 and DFOSC4). This grism can be used out to approx 640nm (as can DFOSC4) without having trouble with the 2. order spectrum. Actually - when used with a cross disperser, the whole spectrum from 330 to 910nm will be covered. The grism has been produced for DFOSC, ALFOSC, IFOSC and HFOSC 0 Prism glas........................ FK5 1 Resin............................. UVres 2 Grism wavelength in min order (nm) 586.0000 3 Groove frequency.................. 300.0000 4 Groove angle...................... 17.4500 5 Best illumination angle of grating -7.0000 6 Prism front angle................. -6.0000 7 Camera focal length............... 146.0000 8 Pixel size (micron)............... 15.0000 9 Image scale (arcsec/pix).......... 0.4000 10 Slit width (arcsec)............... 1.0000 11 # of pixels in dir. dispersion.... 2048.0000 12 No of pts on detector............. 17.0000 13 Min order......................... 1.0000 14 No of orders...................... 2.0000 Grism angle.......................... 21.0544 Prism index at grism wavelength...... 1.4875 Resin index at grism wavelength...... 1.5233 Best prism index..................... 1.8611 Dispersion........................... 211.3089 0-order angle with horizontal........ -10.7650 0-order position on detector......... -1850.5726 Blaze angle in min order............. -1.1097 Blaze position on detector........... -188.5349 Blaze wavelength (nm)................ 526.8143 Anamorphic magnification............. 0.9872 RS product........................... 749.0820 Angle of incidence on facet.......... -0.8368