![]() ![]() ![]() 1, current flows from the p-side (anode) to the n-side (cathode) when the diode is forward biased. Gaussian apodization is what a laserist often uses: This describes amplitude variation of the pupil illumination. For example, when designing a diode collimating lens, one will choose "Afocal image space" in Aperture settings:ģ. In Zemax, as long as the image conjugate is at infinity, the system is afocal. For example, a laser beam expander in which both input and output beams are collimated. The strict definition of an afocal system is a system in which both object and image conjugates are at infinity. This can be used when designing a collimating lens for a diode laser.Ģ. Object cone angle: defined by the half-angle in degrees of the marginal ray in object space. This type of aperture is used when the stop surface is a real, unchangeable aperture buried in the system, for example, fiber coupling.ī. Float by stop size: defined by the radius of the stop surface. When defining a sequential system, the first parameter to set is aperture. Now let me start to accumulate the little rules/tips of ZEMAX:ġ. The first two tasks are aspheric collimating lens for diode and fiber-coupling. Had some non-sequential mode experience but now I really have to use sequential mode, and optimization and tolerancing functions. I have to do extensive ZEMAX work to start my semi-new job. To see how aberration changes the Gaussian beam size, use "Skew Gaussian Beam" function. This is ideal paraxial result without considering any aberrations on the optics. To convert your real beam's waist size to its embedded Gaussian beam's waist, divided it by M.Ģ. What would be better: I wish Zemax can creat a drawing showing Gaussian beam's marginal ray.ġ. This is better than calculating by hand or by Matlab code that I used to do. Both embedded and true Gaussian modes will be given. (3)M 2 factor: the true Gaussian beam has Mx beam radius and Mx divergence compared to the embedded ideal Gaussian beam.Īfter hitting OK, the "Paraxial Gaussian Beam Data" window gives Gaussian beam characteristics on all surfaces Note 2. Note that this is for the embedded ideal Gaussian beam. (2)Waist size: this is 1/e 2 radius value. Zemax asks for 4 initial values to define the input Gaussian beam: Click Settings, or right click mouse, the setting menu appears. A "Paraxial Gaussian Beam Data" window appears. Go to Analysis -> Physical Optics -> Paraxial Gaussian Beam, or simply Ctrl-B. Here I have a diode window and a collimating lens: For example, a lens comprised of two surfaces. Using Zemax to calculate for Gaussian beam propagation is handy and precise.įirst set up your optical system in sequential mode. ![]()
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