Abstract: A beam combining device and method for a Bragg grating external-cavity laser module has a plurality of side by side light-emitting modules that use a Bragg grating to perform wavelength locking. Output light of the modules is incident to a beam combining element after passing through a focusing optical element for beam combining, and light subjected to beam combining is reflected partially and transmitted partially under the effect of a light splitting element. A part is incident into a dispersion element at a diffraction angle of the element. Parallel light is formed under the effect of a conversion optical element. Spots of the light beams of corresponding wavelengths of the light-emitting modules are formed on an image acquisition mechanism. Whether the wavelengths of the corresponding light-emitting modules are locked is determined by whether there is a deviation between preset spots and spots formed by the module on the acquisition mechanism.

Abstract: A beam combining device and method for a Bragg grating external-cavity laser module has a plurality of side by side light-emitting modules that use a Bragg grating to perform wavelength locking. Output light of the modules is incident to a beam combining element after passing through a focusing optical element for beam combining, and light subjected to beam combining is reflected partially and transmitted partially under the effect of a light splitting element. A part is incident into a dispersion element at a diffraction angle of the element. Parallel light is formed under the effect of a conversion optical element. Spots of the light beams of corresponding wavelengths of the light-emitting modules are formed on an image acquisition mechanism. Whether the wavelengths of the corresponding light-emitting modules are locked is determined by whether there is a deviation between preset spots and spots formed by the module on the acquisition mechanism.

Abstract: A high-power semiconductor chip and a preparation method therefor. The semiconductor chip comprises: a substrate (1), a lower confinement layer (2), a lower waveguide layer (3), an active layer (4), an upper waveguide layer (5), a lateral grating layer (10), an upper confinement layer (6), a contact layer (7), a current isolation dielectric layer (8) and a metal layer (9), sequentially arranged from bottom to top, wherein the lateral grating layer (10) comprises a plurality of groups of lateral gratings; the plurality of groups of lateral gratings are sequentially arranged in a first direction; the periods of the plurality of groups of lateral gratings are different from each other; each group of lateral gratings comprises a plurality of gratings; the plurality of gratings are arranged in a second direction; and the first direction intersects with the second direction.

Abstract: A laser puncher for punching holes on tipping paper, comprises a panel, a light guiding cylinder, a laser connected with the light guiding cylinder, and a transmission system for driving a piece of tipping paper to move in a curved manner. The laser puncher further includes at least one focusing optical head, at least one driving motor fixed on the panel, and a connecting rod fixedly connected with at least one moving optical cylinder. The moving optical cylinder is associated with the light guiding cylinder that penetrates the panel and is connected with the focusing optical head. The driving motor drives the focusing optical head to reciprocate back and forth via the connecting rod and the moving optical cylinder.

Abstract: The present invention discloses a laser puncher for punching holes on tipping paper in a curve manner, which comprises a panel, a light guiding cylinder, a laser connected with the light guiding cylinder, a transmission system driving a piece of tipping paper to move and at least one focusing optical head and at least one driving motor is fixed on the panel, a screw shaft is connected with the driving shaft of the driving motor, a nut is connected with the screw shaft and fixedly connected with a connecting rod, the other end of which is fixedly connected with at least one moving optical cylinder, one end of which is provided with the light guiding cylinder, and the other end of which penetrates the panel to be fixedly connected with the focusing optical head, the external periphery of the moving optical cylinder is provided with an anti-rotation linear bearing, which is fixed on the panel, and the driving motor drives the focusing optical head to reciprocate back and forth via the screw shaft, the nut, the c