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Beam stability of b...
Beam stability of buried-heterostructure quantum cascade lasers formed by ICP-etching and HVPE regrowth
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Ryu, J. H. (author)
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Kirch, J. D. (author)
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Knipfer, B. (author)
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Liu, Z. (author)
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Turville-Heitz, M. (author)
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Earles, T. (author)
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Marsland, R. A. (author)
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- Strömberg, Axel (author)
- KTH,Fotonik
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- Omanakuttan, Giriprasanth (author)
- KTH,Fotonik
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- Sun, Yan-Ting (author)
- KTH,Fotonik
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- Lourdudoss, Sebastian, 1953- (author)
- KTH,Fotonik
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Botez, D. (author)
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Mawst, L. J. (author)
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(creator_code:org_t)
- SPIE-Intl Soc Optical Eng, 2021
- 2021
- English.
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In: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE-Intl Soc Optical Eng.
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Scaling the coherent power of mid-infrared (IR)-emitting quantum cascade lasers (QCLs) to the multi-watt range remains an important objective for applications where the laser beam needs to travel through air to remote targets, such as freespace communication links. For such applications requiring long-range pointing accuracy, measurements of beam stability are also important. We present beam-quality measurement results of narrow-ridge (4-5 μm), 4.6 μm-emitting buriedheterostructure (BH) QCLs. A 40-stage, step-tapered active-region (STA) structure was grown by MOCVD, and ICP etching was used to make deep ridges. InP:Fe was preferentially regrown in the field regions by using an SiO2 mask for ridge etching and Hydride Vapor Phase Epitaxy (HVPE). The HVPE process is attractive for selective regrowth, since high growth rates (0.2-0.3 μm/min) can be utilized, and highly planar top surfaces can readily be obtained. HVPE regrowth has been previously employed for BH devices of MBE-grown QCL ridges, but beam-stability measurements were not reported. HR-coated, 7.5 mm-long devices were measured under QCW operation (100 μsec pulse width, 0.5%-10% duty cycle) - very good beam quality factors, M2 < 1.2, were observed for both 4 μm and 5 μm ridge widths, but the narrower ridge exhibited better pointing stability. Collimated 5 μm-wide BH devices displayed some small degree of centroid motion with increasing power (< 0.125 mrad). This corresponds to a targeting error of ∼1.25 cm over a distance of 100 m. Significantly improved lateral-beam stability was observed for narrower ridge width, although at the expense of reduced output power.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
Keyword
- Beam steering
- HVPE
- Quantum Cascade Laser
- Semiconductor laser
- Etching
- III-V semiconductors
- Indium phosphide
- Laser beams
- Quantum cascade lasers
- Semiconducting indium phosphide
- Silica
- Beam quality measurement
- Buried heterostructures
- Free-space communication
- Hydride vapor phase epitaxy
- Pointing stability
- Quantum cascade lasers (QCLs)
- Selective regrowth
- Tapered active regions
- Stability
Publication and Content Type
- ref (subject category)
- kon (subject category)
To the university's database
- By the author/editor
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Ryu, J. H.
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Kirch, J. D.
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Knipfer, B.
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Liu, Z.
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Turville-Heitz, ...
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Earles, T.
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show more...
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Marsland, R. A.
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Strömberg, Axel
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Omanakuttan, Gir ...
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Sun, Yan-Ting
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Lourdudoss, Seba ...
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Botez, D.
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Mawst, L. J.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Electrical Engin ...
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and Other Electrical ...
- Articles in the publication
- Proceedings of S ...
- By the university
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Royal Institute of Technology