Abstract: A trimming capacitor wherein its trimming direction has no directivity. The trimming capacitor comprises a dielectric ceramic sheet provided with a trimming capacitor electrode on the surface thereof, a dielectric ceramic sheet provided with internal capacitor electrodes on the surface thereof, and other sheets. Regions where the trimming capacitor electrode overlaps with the internal capacitor electrodes are disposed so as to be linearly symmetrical about a base line which is inclined by 45.degree. with respect to a long side of the trimming capacitor. Therefore, the trimming electrode can be trimmed in the same way in either the X or the Y direction of the trimming electrode.

Abstract: A solid state laser which has Y.sub.x Gd.sub.1-x VO.sub.4 doped with Nd wherein 0.ltoreq..times..ltoreq.0.5 as a solid laser medium.

Abstract: An optical wavelength conversion device is composed of an organic nonlinear optical material, and a cladding layer having a refractive index lower than the refractive index of the organic nonlinear optical material and covering the organic nonlinear optical material, thereby to convert a fundamental wave entering the optical wavelength conversion device to a second harmonic, and to radiate the second harmonic. At least one of device edge faces including edge faces of the organic nonlinear optical material is provided with a shielding layer for shielding the device edge face from ambient atmosphere, thereby to prevent the organic nonlinear optical material from sublimation and deterioration.