Second‐harmonic generation of surface‐emitted blue light has been achieved in (In,Ga)As/GaAs quantum well edge‐emitting lasers. The blue light is generated by the nonlinear interaction of the internal fundamental fields of a continuously pumped laser. These lasers exhibit room temperature threshold current densities as low as 200 A/cm2and produce about 2.6 nW of blue light for 9.8 mW of fundamental power. The peak emission of the blue light is at 487 nm and the spectral spread is about 1.7 nm. ©1996 American Institute of Physics.