Patent ID: 7871840

Claim:
A method for manufacturing a semiconductor laser diode comprising steps of: (a) forming semiconductor layers sequentially on a semiconductor substrate, the semiconductor layers including an active layer and each being made of compound semiconductor materials; (b) forming a mesa including the active layer by etching the semiconductor layers and a portion of the semiconductor substrate; (c) forming buried layers each made of compound semiconductor material to bury the mesa; (d) etching the buried layers and a portion of the semiconductor substrate so as to form a pair of trenches sandwiching the mesa therebetween; (e) completely filling the trenches with an insulating layer made of material selected from one of SiO 2 , SiN, SiON, Al 2 O 3 and ZrO 2 by using an inductive coupling plasma enhanced chemical vapor deposition with an organic silicon compound as a source material; and (f) forming an electrode on the insulating layer, wherein the inductive coupling plasma enhanced chemical vapor deposition is carried out to provide a first signal with a first frequency to a susceptor and another signal with a second frequency higher than the first frequency to a coil of an apparatus of the inductive coupling plasma enhanced chemical vapor deposition, wherein the first signal has power range of 1/100 to 1/10 with respect to power of the second signal, and wherein the power of the first signal is 100 to 1000W, and the power of the second signal is 500 to 2000 W.