Beam shaping of a broad-area laser diode using 3D integrated optics

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Typical high power broad-area semiconductor lasers exhibit a highly astigmatic beam profile. However, many applications require a homogenous and circular symmetric beam. Thus coupling into circular multimode optical fibers is often employed. The strip-like astigmatic output of the diode laser underfills the circular multimode fiber, thus a decrease in beam quality occurs after fiber coupling due to mode mixing inside the optical fiber. This Letter presents a 3D integrated optics approach to shape the output of a broad-area laser diode. Ultrafast laser inscription is utilized to create a pair of photonic lanterns connected back to back inside a glass chip that captures and shapes the output of a commercial 976 nm wavelength broad-area laser diode with 95 μm emitter width. Compared to coupling to a 105 μm diameter, 0.15 numerical aperture step-index multimode fiber, the photonic chip-based approach results in a 13× higher beam quality and 7× greater brightness.

LanguageEnglish
Pages831-834
Number of pages4
JournalOptics Letters
Volume44
Issue number4
DOIs
Publication statusPublished - 15 Feb 2019

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integrated optics
semiconductor lasers
fibers
output
optical fibers
chips
photonics
numerical aperture
strip
brightness
emitters
glass
profiles
wavelengths
lasers

Cite this

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title = "Beam shaping of a broad-area laser diode using 3D integrated optics",
abstract = "Typical high power broad-area semiconductor lasers exhibit a highly astigmatic beam profile. However, many applications require a homogenous and circular symmetric beam. Thus coupling into circular multimode optical fibers is often employed. The strip-like astigmatic output of the diode laser underfills the circular multimode fiber, thus a decrease in beam quality occurs after fiber coupling due to mode mixing inside the optical fiber. This Letter presents a 3D integrated optics approach to shape the output of a broad-area laser diode. Ultrafast laser inscription is utilized to create a pair of photonic lanterns connected back to back inside a glass chip that captures and shapes the output of a commercial 976 nm wavelength broad-area laser diode with 95 μm emitter width. Compared to coupling to a 105 μm diameter, 0.15 numerical aperture step-index multimode fiber, the photonic chip-based approach results in a 13× higher beam quality and 7× greater brightness.",
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Beam shaping of a broad-area laser diode using 3D integrated optics. / Gross, Simon; Coutts, David W.; Dubinskiy, Mark; Withford, Michael J.

In: Optics Letters, Vol. 44, No. 4, 15.02.2019, p. 831-834.

Research output: Contribution to journalArticleResearchpeer-review

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