S8_ReflectiveSystems

Introduction to CODE V Reflective Systems • 8-1 Copyright © 2008 Optical Research Associates 3280 East Foothill Boulevard Pasadena, California 91107 USA (626) 795-9101 Fax (626) 795-0184 e-mail: service@opticalres.com World Wide Web: http://www.opticalres.com Copyright © 2008 Optical Research Associates Section 8 Reflective Systems Introduction to CODE V Training, “Reflective Systems,” Slide 8-2 Reflective Systems - Setup Differences • Most setup is identical to refracting systems • For standard reflector, enter REFL in the Glass column of the LDM spreadsheet OR select Reflect from the drop-down menu in the Refract Mode column – True for immersed reflectors also (glass picked up automatically) • For a total internal reflector (e.g., Rhomboid prism), enter Only TIR in the Refract Mode column – Glasses are automatically picked up Introduction to CODE V Reflective Systems • 8-2 Copyright © 2008 Optical Research Associates Introduction to CODE V Training, “Reflective Systems,” Slide 8-3 Reflective Systems - Setup Differences (2) • Important points – Signs of thicknesses usually change after each reflection • Positive after even number of reflections • Negative after odd number of reflections • True even for tilted reflectors – Never enter negative indices of refraction (handled automatically internally) • Dummy surfaces and obscurations may be important in reflecting systems Introduction to CODE V Training, “Reflective Systems,” Slide 8-4 Example - Maksutov System 2.72 MM Reflecting Telephoto SCALE 9.2 Introduction to CODE V Reflective Systems • 8-3 Copyright © 2008 Optical Research Associates Introduction to CODE V Training, “Reflective Systems,” Slide 8-5 Maksutov - LDM Spreadsheet REFL entered under Glass or with Refract Mode drop-down menu Note Negative Thickness Introduction to CODE V Training, “Reflective Systems,” Slide 8-6 Maksutov Data Entry RDM Y LEN TIT "Maksutov" FNO 10 DIM M WL 546.1 YAN 0 1.5 S1 -11.78675 0.83073 K4 S2 -12.51825 15.75064 S3 -39.6792 -15.75064 REFL STO CIR OBS 2.0 S4 -12.51825 16.08293 REFL S5 -6.64584 0.3323 K4 S6 0.0 3.33 PIM GO Notes: RDY S2 and RDY S4 are the same surface and should be coupled. Similarly, THI S2 and THI S3 are the same thickness and should be coupled 1 2 3 4 5 6 7 Introduction to CODE V Reflective Systems • 8-4 Copyright © 2008 Optical Research Associates Introduction to CODE V Training, “Reflective Systems,” Slide 8-7 All Reflecting Microscope Objective • EFL = 5 mm • Mag = 36X • NA = 0.5 Introduction to CODE V Training, “Reflective Systems,” Slide 8-8 All Reflecting Microscope Objective LDM and System Data Introduction to CODE V Reflective Systems • 8-5 Copyright © 2008 Optical Research Associates Introduction to CODE V Training, “Reflective Systems,” Slide 8-9 RDM LEN TIT "Reflecting Objective" NA 0.5 DIM M YIM 0 0.25 WL 404 S0 0.0 160.0 S1 0.0 19.83 S2 7.0 -19.83 REFL STO S3 27.5 19.83 REFL CIR OBS 6.5 S4 7.0 13.8 CIR OBS 3.0 PIM SI 0.0 -0.017 GO Reflecting Microscope Data Input S1 (dummy) S2 S3 S5 = SI S4 (dummy surface, curved to match S2) Introduction to CODE V Training, “Reflective Systems,” Slide 8-10 Sign Changes After Reflection positive radius positive radius positive thickness positive radius Z negative radius negative thicknesses positive thickness S3 To make the sign changes: SCA S3..I FAC -1 Introduction to CODE V Reflective Systems • 8-6 Copyright © 2008 Optical Research Associates Introduction to CODE V Training, “Reflective Systems,” Slide 8-11 Sign Changes After Reflection (cont.) • Select surfaces 3 through Image and choose Edit > Scale menu Introduction to CODE V Training, “Reflective Systems,” Slide 8-12 First-Order Data in Reflecting Systems Y U Y U • EFL = - Y / U • Optical EFL (FPX, FPY): – Positive for converging rays – Negative for diverging rays • Refracting system: – Y is positive – U is negative – EFL is positive – FPX, FPY are positive • Reflecting system: – Y is positive – U is positive – EFL is negative – FPX, FPY are still positive Introduction to CODE V Reflective Systems • 8-7 Copyright © 2008 Optical Research Associates Introduction to CODE V Training, “Reflective Systems,” Slide 8-13 Workshop 8-1: Gabor Lens 1.Using data from the two figures, enter this lens into CODE V. Note the surface data are curvatures, not radii (the use of radii or curvatures can be selected by Edit> Radius Mode toggle). Watch out for signs, and be sure to enter any dummy surfaces in their correct locations. The EFL (effective focal length) should be -7.2532 cm Specification data F/number 1.6 Wavelengths 656.3, 587.6, 486.1 Field angles 0°, 1° Dimensions cm Stop Surface 1 2.Use real ray trace data (RSI) for the upper marginal ray for field 2 to determine the obscurations on surfaces 1 and 2 (Hint: look at the ray height on S4). These obscurations make a light-blocking “hole” in the corrector lens, representing the physical structure (“can”) that would hold the field lens and detector array 3.Verify the obscurations are correct with the VIEW option: VIE; FAN YZ 21; CAB; GO Introduction to CODE V Training, “Reflective Systems,” Slide 8-14 Workshop 8-1: Gabor Lens (cont.) 4. Notes on “Obscuration” apertures: — They block rays in analysis options — In Display > View Lens (VIE): • Obscuration is drawn as a hole in the part • Rays blocked only if “Drop CA blocked/obstructed rays” checked on Ray Properties tab (CAB Y) — In Display > 3D Viewing (V3D): • Hole apertures are drawn as holes; obscurations are not drawn as holes • “Dropped Rays” drop down box on Ray Definition tab controls treatment of blocked rays 5. Note on sequential systems: CODE V only “sees” the next surface! If surfaces 2 and 4 are in the same physical location, the ray from surface 1 only interacts with surface 2. Similarly, the ray from surface 3 only interacts with surface 4 Introduction to CODE V Reflective Systems • 8-8 Copyright © 2008 Optical Research Associates Introduction to CODE V Training, “Reflective Systems,” Slide 8-15 Workshop 8-1: Gabor Lens (cont.) Gabor Lens Scale: 2.10 1.19 CM C1 = -0.246 C2 = -0.23038 C3 = -0.06 Surface 4 (dummy) (can be curved to match S2) 6.0 0.4 Glass SK1 Note: All surface data are defined as CURVATURES See detail (next slide) Introduction to CODE V Training, “Reflective Systems,” Slide 8-16 Workshop 8-1: Gabor Lens (cont.) Gabor Lens Scale: 8.10 0.31 CM Surface 4 (dummy) C5 = -0.37264 Glass NSL1 PIM solve Image (S7) 2.0 Thickness = 0.1 C6 = plano Note: All surface data are defined as CURVATURES Introduction to CODE V Reflective Systems • 8-9 Copyright © 2008 Optical Research Associates Introduction to CODE V Training, “Reflective Systems,” Slide 8-17 Workshop 8-1: Gabor Lens (cont.)