Fig. 1. Laser resonator

Fig. 2. Output mode. (a) TEM00 when Rte=1 and Rtm=1, (b) TE01*; (c) Ex component and (d) Ey component of TE01* when Rte=0.99 and Rtm=0.95

Fig. 3. Relationship between resonator transmission constant |γ| and the number of iterations

Fig. 4. Structure chart of L-shaped laser resonator

Fig. 5. Physical map of combination axicon. (a) W cone; (b) inner cone

Fig. 6. (a) Outside view of FAF CO2 laser experimental platform and (b) power detection result

Fig. 7. Burned patterns of acrylic. (a) Laser burned pattern of resonator of combined axicon; laser burned pattern with a polarizer, the polarization directions of the resonator are (b) vertical, (c) horizontal, (d) at 135° direction and (e) at 45° direction, respectively