The system could be setup in the following scheme:ĥ 5 1.2 Exercise 1-2: Symmetrical 4f-system Setup a telecentric 4f-imaging system with two identical plano-convex lenses made of BK7 with thickness d = 10 mm and approximate focal lengths f = 100 mm. In addition, the first surface can be fixed and the second surface is obtained by the program with a solve, that forces the element power to be F=1/f = Unfortunatelly, this doen't work with the first surface. An optimization of one of the surface radii with a focal length requirement in the merit function (EFFL, target value 200) is one general option. To setup a lens with a pregiven focal length, there are several possibilities. Furthermore the input data are not seen in the lens data editor. But this does not allow for general pickups, optimization etc. fixe the next distance (negative after the first mirror) aftre that second coordinate break In princple, it is also possible to use the local coordinate changes of a surface. perform the second 45 rotation to get the final 90 -axis orientation of the propagation axis after the mirror 4. mirror operation, the help function automatically introduces negative thicknesses behind the first mirror 3. change the orientation by 45 to get the local coordinate system of the mirror befor the surface 2.
Here two explicite surfaces of the type coordinate break are introduced before and after the surface with a pickup of the angles. If the spot diagram is considered, what is the reason for the drastic change? Solution: a) The best way to introduce the folding mirror is to used the option 'add folding mirror'. Calculate the radii of the mirrors to recollimate the beam before the refractive lens. The system now should be modified to have an intermediate focal point in the midpoint between the mirrors. e) now extend the separation between the two mirros to 200mm. a) setup the system b) generate layout drawings in 2D and in 3D c) calculate the beam cross section on the second mirror, what is the size of the pattern? d) determine the optimal final sensor plane location. After this pair of mirrors a decentered main objective lens with focal length f = 200 mm made of BK7 is located 25 mm below the optical axis and focusses the beam. 1 Tutorial Zemax Introduction Introduction Exercise 1-1: Stair-mirror-setup Exercise 1-2: Symmetrical 4f-system Introduction 1.1 Exercise 1-1: Stair-mirror-setup Setup a system with a stair mirror pair, which decenters an incoming collimated ray bundle with 10 mm diameter by 40 mm in the -y direction.