Abstract: A mode controlling device for capturing a highly divergent, multi-mode laser beam received from a high-power broad area laser source and producing a narrow, single-mode laser beam. In one embodiment, the mode controlling device comprises a diffractive device having a nonplanar profile positioned to receive the multi-mode laser beam. The diffractive device comprises a plurality of grooves for receiving the multi-mode laser beam and diffracting light to a reflective medium, thereby creating feedback for producing a narrow, single-mode laser beam with a non-uniform intensity profile. The reflective medium may be positioned at the surface of the diffractive device; alternatively, the reflective medium may be positioned at a predetermined distance from the diffractive device.

Abstract: A wire fastener for use in providing a strong, slip resistant structure in which the fastener includes a hump which the wire passes over and includes ears on either side of the hump which are crimped over the wire on both sides of the hump to cause the wire to bend in a double “s” shape over the hump.

Abstract: A mode controlling device for capturing a highly divergent, multi-mode laser beam received from a high-power broad area laser source and producing a narrow, single-mode laser beam. In one embodiment, the mode controlling device comprises a diffractive device having a nonplanar profile positioned to receive the multi-mode laser beam. The diffractive device comprises a plurality of grooves for receiving the multi-mode laser beam and diffracting light to a reflective medium, thereby creating feedback for producing a narrow, single-mode laser beam with a non-uniform intensity profile. The reflective medium may be positioned at the surface of the diffractive device; alternatively, the reflective medium may be positioned at a predetermined distance from the diffractive device.

Abstract: A device for generating blue or green laser light by the use of a device comprising an infrared high power semiconductor laser or an infrared high power semiconductor laser bar or array, a diffractive optical device, and an optical device utilizing a non-linear crystal to generate the blue or green laser light. In one embodiment, the diffractive optical device comprises a volume holographic transmission grating and the optical device comprises a ring resonator. In another embodiment, the diffractive optical device comprises a reflective diffraction grating feedback mechanism and the optical device comprises a ring resonator. In another embodiment, the optical device comprises a parabolic or non-planar feedback mechanism and a ring resonator. In another embodiment, the diffractive optical feedback device, which can be in the form of digital/binary optics, is attached to the semiconductor laser source.