According to the specifications for your laser module:
2.8 - 5.2V DC voltage input
25mA max current draw
You can run it from 3.3V, but any one GPIO pin can supply a max of 16mA (see here
), so you could not drive the laser at full power from a GPIO. If your servo control outputs don't draw too much power you could drive the laser at reduced power (use an appropriate series resistor to limit the current to < 16mA).
It is best to drive the laser with a transistor. No need for a relay, which will take at least as much power to energise the coil as you need for the laser. Something like these
will do for this and many other power switching tasks. You could also use a MOSFET.
For the NPN darlington connect the base to the GPIO output through a resistor (100R to 10K will do), connect the cathode (-ve) of the laser to the collector and the emitter to 0V. Connect the anode (+ve) of the laser to 3.3V or 5V supply via a resistor. When the GPIO is high the transistor will turn on and allow current to flow through the laser.
It isn't clear on Adafruit is the module has inbuilt current limiter. They say "It's a diode with integrated driver". You may not need a series resistor if your power circuit can supply 25mA, but go carefully or you may blow the diode.
Check if the module has a current limiter in it.
You could cheat and use two GPIO outputs commoned via two diodes. DO NOT connect GPIO pins together directly.