1. Normal HeNe Laser Mode Sweep Animation Sam's Laser FAQ (http://www.repairfaq.org/sam/lasersam.htm) Copyright © 1994-2011, Samuel M. Goldwasser, All Rights Reserved Cavity length is approximately 127 mm (~5 inches). Cavity modes are shown at bottom (large tick marks). Lasing modes are shown by red and blue vertical lines. Horizontal polarization is red and vertical is blue. Adjacent modes are orthogonally polarized. Output (beam) power is shown for each mode location. Animation is continuous and loops as cavity expands. Left-click on this slide to view normal mode sweep. (The left and right arrow keys may be used to change mode sweep speed. The right arrow expands the cavity. ESC to exit.)

2. Sam's Laser FAQ (http://www.repairfaq.org/sam/lasersam.htm) Copyright © 1994-2011, Samuel M. Goldwasser, All Rights Reserved