2 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 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.