The modeling and characterization of simple semiconductor wafers of GaAs, InP, etc. as passive laser modulators that give burst of Q-switched pulse and Q-switched mode-locking pulses train will be present in detail. Various simple and inexpensive semicond The modeling and characterization of simple semiconductor wafers of GaAs, InP, etc. as passive laser modulators that give burst of Q-switched pulse and Q-switched mode-locking pulses train will be present in detail. Various simple and inexpensive semicond