摘要The development of quantum cascade laser at 2.94 THz is reported. The laser structure is based on a bound-to-continuum active region and a semi-insulating surface-plasmon waveguide. Lasing is observed up to a heat-sink temperature of 70 K in pulsed mode with light power of 4.75 mW at 10 K and 1 mW at 70 K. A threshold current density of 296.5 A/cm2 and an internal quantum efficiency of 1.57×10−2 per cascade period are also observed at 10 K. The characteristic temperature of this laser is extracted to be T0= 57.5 K.
Abstract：The development of quantum cascade laser at 2.94 THz is reported. The laser structure is based on a bound-to-continuum active region and a semi-insulating surface-plasmon waveguide. Lasing is observed up to a heat-sink temperature of 70 K in pulsed mode with light power of 4.75 mW at 10 K and 1 mW at 70 K. A threshold current density of 296.5 A/cm2 and an internal quantum efficiency of 1.57×10−2 per cascade period are also observed at 10 K. The characteristic temperature of this laser is extracted to be T0= 57.5 K.
[1] Tonouchi M 2007 Nature Photon. 1 97
[2] Qi C C, Zuo D L, Lu Y Z, Tang J, Yang C G, Ke L D and Cheng Z H 2009 Chin. Phys. Lett. 26 124201
[3] Faist J, Capasso F, Sivco D L, Sirtori C, Hutchinson A L and Cho A Y 1994 Science 264 553
[4] Rochat M, Faist J, Beck M, Oesterle U and IIegems M O 1998 Appl. Phys. Lett. 73 3724
[5] Köhler R, Tredicucci A, Beltram F, Beere H E, Linfield E H, Davies A G, Ritchie D A, Iotti R C and Rossi F 2002 Nature 417 156
[6] Kumar S, Hu Q and Reno J L 2009 Appl. Phys. Lett. 94 131105
[7] Williams B S, Kumar S, Hu Q and Reno J L 2006 Electron. Lett. 42 89
[8] Cao J C, Li H, Han Y J, Tan Z Y, Lü J T, Luo H, Sylvain L and Liu H C 2008 Chin. Phys. Lett. 25 953
[9] Rochat M, Ajili L, Willenberg H, Faist J, Beere H, Davies G, Linfield E and Ritchie D 2002 Appl. Phys. Lett. 81 1381
[10] Scalari G, Walther C, Faist J, Beere H and Ritchie D 2006 Appl. Phys. Lett. 88 141102
[11] Scalari G, Ajili L, Faist J, Beere H, Linfield E, Ritchie D and Davies G 2003 Appl. Phys. Lett. 82 3165
[12] Liu J Q, Liu F Q, Lu X Z, Guo Y and Wang Z G 2005 Physica E 30 21
2010, Vol. 27 
