Substrate-emitting quantum cascade lasers with a distributed Bragg reflector and a spectrally detuned second-order outcoupler

Demonstration of substrate-emitting quantum cascade lasers (QCLs) with a distributed Bragg reflector (DBR) used for wavelength selection and a second-order outcoupler spectrally detuned from the reflector is reported. A 40-stage QCL structure with the gain spectrum centered at 4.1 μm was processed i...

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Autores principales:	Enrique Cristobal, Hong Shu, Arkadiy Lyakh
Formato:	article
Lenguaje:	EN
Publicado:	AIP Publishing LLC 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/8fd08d2cffc34892b726bc2e46e050c2
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spelling	oai:doaj.org-article:8fd08d2cffc34892b726bc2e46e050c22021-12-01T18:52:06ZSubstrate-emitting quantum cascade lasers with a distributed Bragg reflector and a spectrally detuned second-order outcoupler2158-322610.1063/5.0073492https://doaj.org/article/8fd08d2cffc34892b726bc2e46e050c22021-11-01T00:00:00Zhttp://dx.doi.org/10.1063/5.0073492https://doaj.org/toc/2158-3226Demonstration of substrate-emitting quantum cascade lasers (QCLs) with a distributed Bragg reflector (DBR) used for wavelength selection and a second-order outcoupler spectrally detuned from the reflector is reported. A 40-stage QCL structure with the gain spectrum centered at 4.1 μm was processed into 20 μm-wide ridge-waveguide devices with a 4 mm-long gain section, a 0.5 mm-long first-order DBR section with 644 nm period, and a 1.5 mm-long second-order outcoupler with 1100 nm period. Etch depth and duty cycle were 900 nm and 45%, respectively, for both gratings. The three sections shared the same electrical contact and were, therefore, pumped at the same current density. A device with a high-reflection coated back facet and anti-reflection coated front facet and substrate side delivered a peak power of 0.6 W from the substrate into a single-lobed beam with ∼1° × 18° angular full width at half maximum (FWHM). Due to the spectral detuning, the beam was extracted from the device at an angle of ∼−34° relative to the growth direction. The measured spectrum had a FWHM of 3 cm−1, and its peak was centered at 4.07 μm, close to the design value of 4.10 μm. The detuning between the two gratings allows for independent optimization of grating profiles to significantly improve the overall laser performance, which will be the focus of future work.Enrique CristobalHong ShuArkadiy LyakhAIP Publishing LLCarticlePhysicsQC1-999ENAIP Advances, Vol 11, Iss 11, Pp 115221-115221-5 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 Enrique Cristobal Hong Shu Arkadiy Lyakh Substrate-emitting quantum cascade lasers with a distributed Bragg reflector and a spectrally detuned second-order outcoupler
description	Demonstration of substrate-emitting quantum cascade lasers (QCLs) with a distributed Bragg reflector (DBR) used for wavelength selection and a second-order outcoupler spectrally detuned from the reflector is reported. A 40-stage QCL structure with the gain spectrum centered at 4.1 μm was processed into 20 μm-wide ridge-waveguide devices with a 4 mm-long gain section, a 0.5 mm-long first-order DBR section with 644 nm period, and a 1.5 mm-long second-order outcoupler with 1100 nm period. Etch depth and duty cycle were 900 nm and 45%, respectively, for both gratings. The three sections shared the same electrical contact and were, therefore, pumped at the same current density. A device with a high-reflection coated back facet and anti-reflection coated front facet and substrate side delivered a peak power of 0.6 W from the substrate into a single-lobed beam with ∼1° × 18° angular full width at half maximum (FWHM). Due to the spectral detuning, the beam was extracted from the device at an angle of ∼−34° relative to the growth direction. The measured spectrum had a FWHM of 3 cm−1, and its peak was centered at 4.07 μm, close to the design value of 4.10 μm. The detuning between the two gratings allows for independent optimization of grating profiles to significantly improve the overall laser performance, which will be the focus of future work.
format	article
author	Enrique Cristobal Hong Shu Arkadiy Lyakh
author_facet	Enrique Cristobal Hong Shu Arkadiy Lyakh
author_sort	Enrique Cristobal
title	Substrate-emitting quantum cascade lasers with a distributed Bragg reflector and a spectrally detuned second-order outcoupler
title_short	Substrate-emitting quantum cascade lasers with a distributed Bragg reflector and a spectrally detuned second-order outcoupler
title_full	Substrate-emitting quantum cascade lasers with a distributed Bragg reflector and a spectrally detuned second-order outcoupler
title_fullStr	Substrate-emitting quantum cascade lasers with a distributed Bragg reflector and a spectrally detuned second-order outcoupler
title_full_unstemmed	Substrate-emitting quantum cascade lasers with a distributed Bragg reflector and a spectrally detuned second-order outcoupler
title_sort	substrate-emitting quantum cascade lasers with a distributed bragg reflector and a spectrally detuned second-order outcoupler
publisher	AIP Publishing LLC
publishDate	2021
url	https://doaj.org/article/8fd08d2cffc34892b726bc2e46e050c2
work_keys_str_mv	AT enriquecristobal substrateemittingquantumcascadelaserswithadistributedbraggreflectorandaspectrallydetunedsecondorderoutcoupler AT hongshu substrateemittingquantumcascadelaserswithadistributedbraggreflectorandaspectrallydetunedsecondorderoutcoupler AT arkadiylyakh substrateemittingquantumcascadelaserswithadistributedbraggreflectorandaspectrallydetunedsecondorderoutcoupler
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Substrate-emitting quantum cascade lasers with a distributed Bragg reflector and a spectrally detuned second-order outcoupler

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