High-efficient low-order mode transverse flow CO2 laser

Abstract

The disclosed integrated device is composed of laser head, DC power source in high voltage, resistor and gas-extraction system. The laser head consists of blower fan, air passage, arc chamber, heat exchanger and optical cavity. Each part adopted in module structure is assembled in a sealed square box body. Discharge excitation for laser is DC discharge. Electrode structure adopted in sheet type electrode with wide anode bar makes discharge zone match to mode volume of cavity. Constant current technique in low resistance is adopted to reduce electric loss. Power source of using high frequency switch increases conversion efficiency for transforming and delivering electric power, and optical cavity is optimized to reach output of laser in low order modulo under high electro-optical conversion efficiency and high output power.

Description

technical field [0001] The present invention relates to CO 2 Lasers, especially a high-efficiency low-order mode cross-flow CO 2 Laser, which has high electro-optical conversion efficiency, low-order mode oscillation output, and compact structure, is especially suitable for laser welding and cutting. Background technique [0002] DC discharge of cross-flow CO 2 The laser adopts three-axis orthogonal excitation technology, that is, the direction of airflow, discharge direction and light oscillation direction are perpendicular to each other, so the discharge channel (section) is relatively large, generally up to 25×40mm, and the large-size cavity mirror is selected to directly transmit the oscillation light energy in the cavity. Coupled out to obtain multi-mode output laser. In general, the direct electro-optical conversion efficiency is around 15%. If you want to obtain low-order mode oscillation output, it is usually by adding a diaphragm in the cavity. Under the stable ...

AI Technical Summary

Problems solved by technology

If you want to obtain low-order mode oscillation output, it is usually by adding a diaphragm in the cavity. Under the stable cavity structure, for TEM 00 Model ~ TEM 11 Mode, the spot diameter is about φ10~φ22mm, the utilization rate of the entire active area is very low, with the decrease of the transverse mode order, the laser output power and photoelectric conversion efficiency are reduced, so some use the folded cavity method, as far as possible Utilize active region volume to obtain high power low order mode output

Due to the negative resistance effect of DC gas discharge, in order to stabilize the glow discharge, a current-limiting resistor is generally connected in series in the discharge circuit. The resistance of the current-limiting resistor is relatively large, about a few kΩ, so the power consumption in the circuit is relatively high. In addition, the high-voltage DC power supply of previous products often adopts thyristor voltage regulation or thyristor module voltage regulation, which is a 50Hz power frequency step-up rectification technology. cooling device

Many factors make the electro-optical conversion efficiency of the final equipment very low. In the current situation of relatively tight power resources, it is very necessary to improve the electro-optic conversion efficiency of the equipment and reduce the cost of use.

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