Pump coupler for hectowatt fiber laser

The invention relates to a pump coupler for a hectowatt fiber laser, which comprises a packaging shell. A pump fiber and a main fiber are guided inside the packaging shell; the packaging shell comprises an optical adhesive layer, the optical adhesive layer is coated with light guiding glass, the light guiding glass is coated with a heat conduction adhesive layer, a heat conduction copper tube sleeves the heat conduction adhesive layer, cooling sheets are distributed around the heat conduction copper tube, a temperature sensor for sensing working temperature is embedded inside the heat conduction copper sleeve, and a temperature controller for monitoring a working condition is connected with a temperature sensor. The packaging shell can effectively cool the pump coupler, the working temperature of the pump coupler is monitored via the temperature sensor, and thus the pump coupler can work stably for a long time in the fiber laser. Through the temperature sensor and the temperature controller, the pump coupler can work stably for a long time in the hectowatt fiber laser and is particularly applicable to an environment in a factory with uninterrupted production all day long.