Thermoelectric Effect in Quantum Cascade Lasers

被引：10

作者：

Escarra, Matthew D. ^{[1
]}

Benz, Alexander ^{[1
,2
]}

Bhatt, Anjali M. ^{[1
,3
]}

Hoffman, Anthony J. ^{[1
]}

Wang, Xiaojun ^{[4
]}

Fan, Jen-Yu ^{[4
]}

Gmachl, Claire ^{[1
]}

机构：

[1] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA

[2] Vienna Univ Technol, Photon Inst, A-1040 Vienna, Austria

[3] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[4] AdTech Opt Inc, City Of Industry, CA 91748 USA

来源：

IEEE PHOTONICS JOURNAL | 2010年 / 2卷 / 03期

关键词：

Quantum cascade lasers; thermoelectric effect; superlattice devices; optoelectronic materials; thermal modeling; HIGH-PERFORMANCE; TRANSPORT;

D O I：

10.1109/JPHOT.2010.2050304

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The choice of polarity of operation in a quantum cascade (QC) laser is made at the beginning of every QC laser design and growth, yet little work has been done to ascertain any performance benefits of one polarity versus the other. In this paper, we compare two QC lasers of the same design, differentiated only by the reversing of the growth order of the heterostructure layers in the laser core, which results in opposite polarities of operation. Analysis is performed through continuous wave (CW) and pulsed threshold current measurements to observe the change in active core temperature with input power. A thermoelectric effect is observed, where the direction of current flow improves thermal transport in negative polarity lasers (electron flow toward the heat sink) over positive polarity (electron flow away from the heat sink), leading to a maximum observed reduction in laser core heating of 10.0 +/- 5.5 K for a thermal load of 7.2 kW/cm(2) in CW operation.

引用

页码：500 / 509

页数：10

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