Figure 16

Calculated focal areas of the five harmonics 9^th, 11^th, 13^th, 15^th and 17^th. The graph depicts the harmonic beam waist as a function of the distance from the focus of the spherical mirror. The x-axis shows the focus position of the harmonics on the propagation axis. The focus position of the harmonics is found to be ≈ 290 μm away from the focus of the 5 cm mirror. Their beam waist ratios are 0.99:1.01:1:0.87:0.67 for harmonic 9^th, 11^th, 13^th, 15^th and 17^th respectively.