Patent ID: 8300305

Claim:
A method of producing ultraviolet light characterized in that a crystal of the family A x M 1-x X 3 (BO 3 ) 4 , wherein both A and also M stand for an element from the group Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, A≠M and X is selected from the group consisting of Al, Ga, and Sc and 0≦x≦1, is used as a non-linear optical element to produce light of a wavelength of less than 0.360 μm, and wherein an electromagnetic wave of the wavelength λ is passed through the crystal in such a way that the propagation direction includes the angle θ+/−Δθ with the optical axis Z and the angle φ+/−Δφ with the optical axis X and the crystal is used to produce the second harmonic of the wavelength 0.5λ, wherein λ, θ, Δθ, φ, Δφ and 0.5λ assume the values of a line in the following Table: λ 0.5 λ (μm) +/− (μm) 0.001 θ(°) Δθ(°) φ(°) Δφ(°) 0.498 +/− 0.002 0.249 79.58 2.50 0 1.5 0.502 +/− 0.002 0.251 77.13 2.00 0 1.5 0.506 +/− 0.002 0.253 75.10 2.00 0 1.5 0.510 +/− 0.002 0.255 73.35 2.00 0 1.5 0.514 +/− 0.002 0.257 71.79 1.50 0 1.5 0.519 +/− 0.002 0.2595 70.04 1.50 0 1.5 0.523 +/− 0.002 0.2615 68.77 1.50 0 1.5 0.527 +/− 0.002 0.2635 67.60 1.50 0 1.5 0.531 +/− 0.002 0.2655 66.49 1.50 0 1.5 0.535 +/− 0.002 0.2675 65.46 1.00 0 1.5 0.540 +/− 0.002 0.270 64.24 1.00 0 1.5 0.545 +/− 0.002 0.2725 63.11 1.00 0 1.5 0.550 +/− 0.002 0.275 62.04 1.00 0 1.5 0.560 +/− 0.002 0.280 60.07 1.00 0 1.5 0.570 +/− 0.002 0.285 58.30 1.00 0 1.5 0.580 +/− 0.002 0.290 56.68 1.00 0 1.5 0.590 +/− 0.002 0.295 55.19 1.00 0 1.5 0.600 +/− 0.002 0.300 53.81 1.00 0 1.5 0.604 +/− 0.002 0.302 53.29 1.00 0 1.5 0.608 +/− 0.002 0.304 52.78 1.00 0 1.5 0.612 +/− 0.002 0.306 52.29 0.75 0 1.5 0.636 +/− 0.002 0.318 49.59 0.75 0 1.5 0.640 +/− 0.002 0.320 49.18 0.75 0 1.5 0.644 +/− 0.002 0.322 48.78 0.75 0 1.5