| 摘要 |
PURPOSE:To provide the waveguide type wavelength transducing element of the structure with which secondary higher harmonics are obtd. from the plane waveguide by providing a side wall onto the crystal plane of lithium niobate in the direction nearly orthogonal with the Z-axis thereof and providing a channel optical waveguide and the plane waveguide along the side wall. CONSTITUTION:A substrate 1 is the crystal plate of LiNbO3 and the side wall 2 progressing in the direction nearly orthogonal with the Z-axis is provided on this crystal plane. The channel light guide 3 is formed on the crystal plane along the side wall 2. The plane waveguide 4 is provided in combination on the same crystal plane on which the channel optical waveguide 3 is formed. The wave front propagation direction is rotated in the plane waveguide 4 when a basic wave of 0.83mum wavelength is injected to the channel optical waveguide 3 by using semiconductor laser 10 light as the basic wave. This light is then radiated from the crystal end face as the SHG light 6 of 0.415mum which is the secondary higher harmonics at about 16-17 deg. angle from the Y-axis by having the spreading angle one-dimensionally in the perpendicular direction of the waveguide and is transduced to a circularly collimated beam 8 by a cylindrical lens 7. |
