6 results about "Tapered beam" patented technology

The present application relates to the field of laser technology, in particular to a kind of tunable multi-wavelength hollow laser based on translation-rotation collaborative regulation crystal axicon, the pump beam emitted by fiber-coupled semiconductor laser array is collimated by first convex lens, focused by second convex lens, and focused to laser gain medium by plano-concave mirror;Plano-concave mirror and plane mirror form laser resonator, and negative glass axicon diverges parallel light beam in laser resonator into conical light beam, and emits parallelly after the refraction of positive glass axicon;Through the collaborative regulation of synchronous rotation first crystal axicon / second crystal axicon and moving second crystal axicon, the loss of each laser wavelength in laser resonator is dynamically adjusted, so that the oscillation threshold of multiple wavelength lasers in laser resonator is equal, and then the simultaneous stable operation of multi-wavelength laser is ensured.The present application not only can efficiently realize the synchronous output of multi-wavelength hollow laser, but also can provide flexible dynamic tuning capability between multiple wavelengths for device.

The invention discloses a light absorber for conical light beam shaping and a light absorption method, and solves the problems that the existing shaping mode of an optical fiber output light beam is limited through a proper through hole, so that generated miscellaneous light is uncontrollable and possibly becomes harmful light of an optical system. The device comprises a metal reflection circular truncated cone with the taper angle of 50-70 degrees and tubular absorption glass. The metal reflection circular truncated cone is arranged in the absorption glass, the end with the large outer diameter is connected with one end of the absorption glass in a sealed mode, an expansion channel which is gradually enlarged is formed in the metal reflection circular truncated cone in the light beam transmission direction, and the outer wall of the metal reflection circular truncated cone and the inner wall forming the expansion channel form a blade edge structure; the outer surface of the metal reflection circular truncated cone and the inner wall of the absorption glass form a reflection channel of the miscellaneous light, when the miscellaneous light enters the surface of the absorption glass, most of the miscellaneous light is absorbed, a small part of the miscellaneous light is reflected to the outer surface of the metal reflection circular truncated cone to be reflected again, and the miscellaneous light can be removed through multiple times of reflection and absorption.

The invention discloses a welding device for a nuclear fuel cladding tube and an end plug, the welding device comprises a reflecting part and an emitting part, the reflecting part is provided with an annular reflecting surface capable of reflecting light beams, and the annular reflecting surface is arranged around an annular welding seam in the circumferential direction; in the axial direction corresponding to the circumferential direction, the emitting part is located on one side of the reflecting part; the emitting part can emit conical light beams, and the conical light beams are reflected by the annular reflecting face and then irradiate all the positions, arranged in the circumferential direction, of the annular weld joint at the same time. According to the invention, the conical light beams are emitted along the same conical surface, and after being reflected by the annular reflecting surface, the conical light beams can cover the annular welding seam along 360 degrees, so that all the positions of the welding seam along the circumferential direction are irradiated and heated at the same time and welding is realized, and therefore, all the positions of the welding seam along the circumferential direction are heated more uniformly, and the sealing performance of the welding seam is stronger.

The utility model discloses a laser spot shaping device for non-contact laser fat reduction, and belongs to the technical field of laser modulation shaping. The laser spot shaping device comprises a laser input device, a laser shaping device and a laser output port which are connected in sequence, according to the laser shaping device, diversified light spot shapes, sizes and corresponding imaging distances are achieved through optical lens combination, and various treatment requirements are met. By adopting the structure, the polygonal homogenizing optical fiber is adopted to transmit laser emitted by the laser, so that the laser is uniformly distributed, then light spots are focused through the plano-convex lens, and then the light spots are expanded through the biconcave lens, so that a divergent conical light beam is formed; the divergent conical light beam focuses the light spot through the Fresnel lens, and the technical scheme of focusing through the Fresnel lens can increase the surface area of the light spot acting on the skin, so that the area of the output laser irradiated on the skin is larger while the area of the output laser irradiated on the fat is not changed.

A laser additive manufacturing device with in-light coaxial wire feeding: It mainly consists of a cylinder body, a holographic optical element I, a holographic optical element II with a central through-hole, a wire feeding tube, a cooling system, a positioning and supporting element installed above the cylinder body, and a coaxial laser head part. It is characterized in that: the incident laser beam forms two beams separated from each other in space after being diffracted by the holographic optical element I and is diffracted onto the surface of the holographic optical element II. After being diffracted by the holographic optical element II again, a conical beam with a hollow lightless area is formed. The wire feeding tube is inserted into this lightless area from the through-hole of the holographic optical element II, so as to achieve the complete coaxiality of the beam, the wire material and the shielding gas and perpendicularity to the additive manufacturing surface. The present invention utilizes the diffraction effect of two holographic optical elements on the laser beam, realizes in-light coaxial wire feeding, improves the forming quality and efficiency, reduces the structural complexity, ensures the isotropy of laser wire feeding forming, and the overall system is easy to control, thus improving the energy utilization rate.