Quantum-well C3 laser

A quantum-well cleaved-coupled-cavity (C³) laser was investigated. A high output power with a line width of less than 70 MHz at half-amplitude was achieved. The side modes were suppressed by more than 20 dB. A laser of this type was found to exhibit 'hard' mode hopping, which could be reversible or irreversible (in the latter case the initial laser spectrum was not restored after the modulating current ceased to flow).