Greater than 150 degrees C CW lasing is achieved From an unbonded GaAs
/AlGaAs VCSEL by employing high barrier confinement spacers and by blu
e shifting the optical gain. This is done while maintaining a variatio
n in threshold current of only +/-0.93mA over a range greater than 150
degrees C. These results are compared to a low barrier VCSEL of simil
ar design.