LaserCanvas 5 > Tutorials > Collimating Telescope >

Part 1. Construct the Cavity

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• From the File menu, select New Propagation, or click the  New Propagation button on the toolbar.
• In the Propagation System properties, enter the HeNe laser wavelength, 632 nm.
• Click on the radio button to set the Input Parameters as Mode and Curvature.
• Enter the remaining parameters as shown.

• 
  Select the system segment by clicking the Source optic at the centreline.
• Insert two lenses by selecting menu Edit | Insert | Lens or clicking the  Lens button on the toolbar.
• Select the first lens by clicking at the centreline.
• 
  In the Property Manager, set the focal length to -200 mm. This is our diverging lens.

• Select the second lens by clicking at the centreline.
• 
  In the Property Manager, set the focal length to +400 mm. This is our collimating lens.

• 
  Additionally, set the Distance to Next to 500 mm, to give some extra space to the terminating screen.
• Save the system by selecting menu File | Save As... or clicking the  Save button on the toolbar.

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