Abstract:Thermal-Resistor of Rated output power of 1 W,2 W and 3 W of 808 nm Semiconductor Lasers have been measured with the method of Wavelength shift on this essay,Through the Thermal-Resistance measurement,we can get when the Lasers are working in their Rated output power,the Thermal-Resistor are the lowest,they are 4.28 K/W,5.45 K/W and 5.5 K/W.We have test the temperature rising of Rated output power of 3 W in different duty cycle,getting when duty cycle is 0.5%,the temperature rising under continuous temperature rise is equivalent to 19.6%。Temperature changes with time has been simulationed with ANSYS simulation software,we get the feature of Pulse is that the temperature rising is equivalent to 50% of Steady-state in 1 ms,it can get more than 95% of Steady-state in 0.1 s.