![]() The value of 0.5454 says that the spot is not diffraction limited. The number in the upper right hand corner is the and represents how close to perfect the optical system is. The easiest way to display the Strehl ratio is to go to the UW 1 Window and click the first icon in the UW 1 window and selecting Lens Drawing. Generally, a Strehl value above 0.8 represents a diffraction limited spot. The Airy disk is of importance in physics, optics, and astronomy. However, to quantitative assess whether the system is diffraction limited, the Strehl ratio is commonly used. In optics, the Airy disk(or Airy disc) and Airy patternare descriptions of the best-focusedspotof lightthat a perfect lenswith a circular aperturecan make, limited by the diffractionof light. Now, most points fall within the Airy disk! The thickness should change to -7.968223. The easiest way to do this is to click on the button in the thickness column in the IMS row and selectĪutofocus - Minimum RMS Spot Size -> On-Axis Monochromatic It would improve the focus if we move the IMS back towards the mirror. Now it is clear that the best focus does not coincide with the image surface IMS. The influence of the Nd concentration, of the pump spot-size. If you zoom into the region around the focus you see efficiency is 40 and the output beam divergence is about two times the diffraction limit. However this window allows you to click drag a rectangle to zoom into a region of interest. You should now see a new row of icons,Ĭlick on the second icon in the UW 1 menu and the Autodraw image will be repeated. Do this by clicking the first icon in the UW 1 window and selecting Lens Drawing. However, it is possible to zoom using the UW 1 Window. If we look at the focusing of the mirror in the default autodrawing image, it looks just fine. First, let's add a few extra rays to the ray drawing by going to menuĪnd increasing the number of rays drawn from 3 to 7. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |