THE STUDY OF OPTICAL GAIN FOR TERAHERTZ QUANTUM CASCADE LASER USING DENSITY MATRIX METHOD. Jurnal Teknologi, [S. l.], v. 78, n. 9, 2016. DOI: 10.11113/jt.v78.7392. Disponível em: https://journals.utm.my/jurnalteknologi/article/view/7392.. Acesso em: 18 may. 2024.