Thermal characteristics of spontaneous emission spectra from external-cavity surface-emitting lasers

ZHAN Xiaohong; ZHU Renjiang; JIANG Maohua; HU Ping; CUI Yuting; ZHANG Peng

doi:10.7510/jgjs.issn.1001-3806.2016.04.032

LASER TECHNOLOGY > 2016 > 40(4): 610-614. > DOI: 10.7510/jgjs.issn.1001-3806.2016.04.032

ZHAN Xiaohong, ZHU Renjiang, JIANG Maohua, HU Ping, CUI Yuting, ZHANG Peng. Thermal characteristics of spontaneous emission spectra from external-cavity surface-emitting lasers[J]. LASER TECHNOLOGY, 2016, 40(4): 610-614. DOI: 10.7510/jgjs.issn.1001-3806.2016.04.032

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Thermal characteristics of spontaneous emission spectra from external-cavity surface-emitting lasers

ZHAN Xiaohong^1,2,3,
ZHU Renjiang^1,2,3,
JIANG Maohua^1,2,3,
HU Ping⁴,
CUI Yuting^1,2,3,
ZHANG Peng^1,2,3, ,

1.
College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 400047, China;
2.
High Education Key Laboratory of Optoelectronic Materials and Engineering Chongqing, Chongqing Normal University, Chongqing 400047, China;
3.
Key Laboratory of Optoelectronic Functional Materials Chongqing, Chongqing Nornal University, Chongqing 400047, China;
4.
Department of Materials Engineering, Sichuan Electromechanical Institute of Vocation and Technology, Panzhihua 617000, China

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Received Date: June 08, 2015
Revised Date: September 06, 2015
Published Date: July 24, 2016

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Abstract

Abstract

Thermal effect is the main reason limiting output power and beam quality of vertical-external-cavity surface-emitting lasers (VECSELs). To optimize the quantum design in active regions of gain chip, decrease thermal effect and upgrade slope efficiencies and output laser power, thermal characteristics of a VECSEL at 980nm wavelength were investigated experimentally by means of photoluminescence. The edge-emitting and surface-emitting spectra at different heatsink temperatures were obtained. The results indicate that the redshift rate of the edge-emitting spectra, which revels the intrinsic properties of quantum wells in active region, is 0.5nm/K with increasing temperature, while the redshift rate of the surface-emitting spectra, which are modulated by multiple-layer structure of the gain chip, is only 0.1nm/K with increasing temperature. The experiments also show that the surface-emitting spectra are split into several modes because of the restriction from the micro-cavities in gain chips of VECSELs. In the design of VECSEL gain chip, according to the above thermal characteristics of VECSELs, performance of a laser could be improved significantly by prebiasing emission wavelengths of quantum wells and cavity lengths of micro-cavities.
- lasers,
- external-cavity surface-emitting laser,
- photoluminescence spectrum,
- thermal characteristic

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References

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