While I am not familiar with the Zigbee, I can assume it can transmit digital data while your laser sensor has only an analog output.
It has ,however, one "alarm" bit which can possibly be transmitted through Zigbee.
I think you should either find a laser sensor with a digital output, or, you will have to first connect and ADC, the analog-to-digital converter to digitalize the analog voltage output from the sensor.
ADCs are possibly easiest to get as Arduino modules, available for amateur designers (google where available).