Åsa Haglund

UVC photonic crystal surface-emitting lasers with low-divergent far-fields

Optically Pumped UVC Photonic Crystal Surface-Emitting Laser

2023

Athermalization of the Lasing Wavelength in Vertical-Cavity Surface-Emitting Lasers

2023

Increased Light Extraction of Thin-Film Flip-Chip UVB LEDs by Surface Texturing

Electrochemical etching - a key enabler for III-nitride VCSELs and LEDs?

Out of the blue: UV VCSELs

Thermal Transport in c-plane GaN Membranes Characterized by Raman Thermometry

Thin-film flip-chip UVB LEDs realized by electrochemical etching

Growth of UVB tunnel-junction LEDs: Impact of GaN interlayer thickness on morphology and electro-optical characteristics

Membrane-based VCSELs and LEDs by electrochemical etching

Electrochemical etching – a key enabler for thin-film VCSELs and LEDs?

Blue and UV VCSELs: today and tomorrow

UV VCSELs – this is the way

Stretching VCSELs to the UV

Thin-film UV VCSELs and LEDs by electrochemical etching

The past, the present and the future of III-nitride VCSELs

Introduction to the JSTQE Special Issue on Semiconductor Lasers

2022

Low-Threshold AlGaN-based UVB VCSELs enabled by post-growth cavity detuning

Single-mode lasing in optically pumped UVB VCSELs with circular relief structures

Advances in ultraviolet-emitting vertical-cavity surface-emitting lasers

2021

A 310 nm Optically Pumped AlGaN Vertical-Cavity Surface-Emitting Laser

Membrane-Based Light-emitters from the Blue to the Ultraviolet Wavelength Regime by Electrochemical Etching

2021

Impact of Stripe Shape on the Reflectivity of Monolithic High Contrast Gratings

Thermal wavelength stability of ultraviolet-B vertical-cavity surface-emitting lasers enabled by short cavity length and dielectric mirrors

Impact of polarization fields on electrochemical lift-off of GaN membranes

Out of the blue: ultraviolet vertical-cavity surface-emitting lasers

Monolithic high-index contrast grating mirror for a GaN-based vertical-cavity surface-emitting laser

2021

Smooth GaN membranes by polarization-assisted electrochemical etching

Membrane-based VCSELs and LEDs from the blue to the ultraviolet wavelength regime

GaN-based vertical-cavity surface-emitting laser incorporating a TiO2 high-index-contrast grating

Are blue and ultraviolet VCSELs a reality or just a dream?

A 310 nm optically pumped AlGaN VCSEL with two dielectric distributed Bragg reflectors

Prospects and challenges for UV LEDs and UV lasers with tunnel junctions

Recent progress for blue VCSELs and challenges to move to UV

Electrically Injected GaN-Based Vertical-Cavity Surface-Emitting Lasers with TiO2 High-Index-Contrast Grating Reflectors

2020

Thin-film flip-chip UVB LEDs realized by electrochemical etching

2020

Optical microprism cavities based on dislocation-free GaN

Vertical AlGaN-microcavity with two dielectric distributed Bragg reflectors emitting at 330 nm

Vertical microcavity based on an AlGaN membrane with two dielectric distributed Bragg reflectors emitting at 330 nm

Blue and ultraviolet vertical-cavity surface-emitting lasers

2019

Electrochemical etching of AlGaN for the realization of thin-film devices

Prospects and challenges for UV LEDs and UV lasers with tunnel junctions

UVB-emitting vertical-cavity surface-emitting laser

Blue and ultraviolet thin-film light emitters

Quality factors of vertical cavities based on dislocation-free and atomically flat III-nitride hexagonal micro-prisms

Growth of dislocation-free and atomically flat III-nitride micro-prisms

Pushing performance in blue and UV VCSELs by nanometer structuring

Towards ultraviolet and blue microcavity lasers

Vertical Electrical Conductivity of ZnO/GaN Multilayers for Application in Distributed Bragg Reflectors

GaN vertical-cavity surface-emitting laser with a high-contrast grating reflector

Lasing Action in GaN-Based VCSELs with top High-Contrast Grating Reflectors

Thin-film UVB LEDs enabled by electrochemical etching of AlGaN

Should we strive to follow Nature’s checklist on how to claim lasing?

Effect of compositional interlayers on the vertical electrical conductivity of Si-doped AlN/GaN distributed Bragg reflectors grown on SiC''

2017

Electrically conductive ZnO/GaN distributed Bragg reflectors grown by hybrid plasma-assisted molecular beam epitaxy

2017

Multi-wavelength VCSEL arrays using high-contrast gratings

Nanoscale structuring to improve laser performance

Thermal lensing effects on lateral leakage in GaN-based vertical-cavity surface-emitting laser cavities

2017

Wavelength Control of VCSELs using High-Contrast Gratings

2016

Progress and challenges in electrically pumped GaN-based VCSELs

2016

GaAs High-Contrast Gratings with InGaP Sacrificial Layer for Multi-Wavelength VCSEL Arrays

2016

Demonstration of post-growth wavelength setting of VCSELs using high-contrast gratings

Pulse transient Hot Strip technique – a unique method for measuring anisotropic thermal transport properties in stacked nm-thick layers

2015

Air-suspended TiO2-based HCG reflectors for visible spectral range

GaN-based VCSELs

Thermal conductivity and thermal diffusivity measurements of various µm-thin films by pulse transient hot strip technique

Demonstration of post-growth wavelength control of VCSELs using high-contrast gratings

2015

TiO2 membrane high-contrast grating reflectors for vertical-cavity light-emitters in the visible wavelength regime

2015

Integration of GaAs-based VCSEL array on SiN platform with HCG reflectors for WDM applications

High-contrast gratings for WDM VCSEL arrays

2014

Quasi-single mode VCSELs for longer-reach multimode fiber optical interconnects

2014

Pulse transient hot strip technique adapted for slab sample geometry to study anisotropic thermal transport properties of mu m-thin crystalline films

2014

Analysis of structurally sensitive loss in GaN-based VCSEL cavities and its effect on modal discrimination

Triggering of guiding and antiguiding effects in GaN-based VCSELs

High-speed, high-temperature VCSELs for optical interconnects

Engineering the Lateral Optical Guiding in Gallium Nitride (GaN)-based Vertical-Cavity Surface-Emitting Laser (VCSEL) Cavities to Reach the Lowest Threshold Gain

High speed 850nm VCSELs for >40Gb/s transmission

2013

850 nm datacom VCSELs for higher-speed and longer-reach transmission

2013

Metal-Free Graphene as Transparent Electrode for GaN-Based Light-Emitters

Integrated MEMS-tunable VCSELs for reconfigurable optical interconnects

Graphene as transparent electrode for GaN-based VCSELs

2012

Engineering the transverse optical guiding in GaN-based VCSELs to avoid detrimental optical loss

Integrated MEMS-Tunable VCSELs Using a Self-Aligned Reflow Process

Mode-filtered semiconductor lasers enable longer-reach optical interconnects

2012

Impact of photon lifetime on thermal rollover in 850-nm high-speed VCSELs

2012

4-PAM for high-speed short-range optical communications

2012

Polarization investigation of a tunable high-speed short-wavelength bulk-micromachined MEMS-VCSEL

High-speed lasers for optical interconnects

Impact of device parameters on thermal performance of high speed oxide confined 850 nm VCSELs

Direct Chemical Vapor Deposition of Large-Area Carbon Thin Films on Gallium Nitride for Transparent Electrodes: A First Attempt

High-speed tunable and fixed-wavelength VCSELs for short-reach optical links and interconnects

2012

Reducing the spectral width of high speed oxide confined VCSELs using an integrated mode filter

2012

25 Gbit/s transmission over 500 m multimode fibre using 850 nm VCSEL with integrated mode filter

High speed VCSELs for optical interconnects

High speed VCSELs for short reach communication

2011

Assessment of VCSEL thermal rollover mechanisms from measurements and empirical modeling

Integrated MEMS-tunable VCSELs with high modulation bandwidth

2011

30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL

High speed VCSELs for short reach communication

2011

Realization of spectrally engineered semiconductor Fabry-Perot lasers with narrow geometrical tolerances

Impact of Photon Lifetime on High-Speed VCSEL Performance

Growth of dilute nitrides and 1.3 μm edge emitting lasers on GaAs by MBE

2011

Tuneable VCSEL aiming for the application in interconnects and short haul systems

32 Gb/s multilevel modulation of an 850 nm VCSEL for next-generation datacommunication standards

Higher speed VCSELs by photon lifetime reduction

Orthogonal multipulse modulation for next-generation datacommunication links

2011

30 Gbps 4-PAM transmission over 200m of MMF using an 850 nm VCSEL

Singlemode tunable VCSELs with integrated MEMS technology

Low Spectral Width High-Speed VCSELs

2010

37 Gbps transmission over 200 m of MMF using single cycle subcarrier modulation and a VCSEL with 20 GHz modulation bandwidth

High speed low current density 850 nm VCSELs

2010

40 Gbit/s error-free operation of oxide-confined 850 nm VCSEL

Advances in VCSELs for Communication and Sensing

Integrated Tunable VCSELs With Simple MEMS Technology

Speed enhancement of VCSELs by photon lifetime reduction

2010

Active Region Design for High-Speed 850-nm VCSELs

Mg-doped Al0.85Ga0.15N layers grown by hot-wall MOCVD with low resistivity at room temperature

High-speed 850-nm VCSELs for 40 Gb/s transmission

850 nm VCSEL Operating Error-Free at 40 Gbit/s

High speed large aperture 850 nm VCSELs

High speed, low current density 850 nm VCSELs

Widely tuneable micromachined VCSELs – new results

32 Gbit/s multimode fibre transmission using high-speed, low current density 850 nm VCSEL

Short-wavelength tunable VCSELs

Optimized active region design for high speed 850 nm VCSELs

High speed VCSELs for broadband interconnects

VCSELs for broadband access and interconnects

32 Gb/s transmission experiments using high speed 850 nm VCSELs

Impedance characteristics and parasitic speed limitations of high speed 850 nm VCSELs

13 GHz Bandwidth of 1.31 μm GaInNAs Triple Quantum Well Lasers

A high-speed laser for future data-communication links

A 1.31 μm GaInNAs Triple Quantum Well Laser with 13 GHz Small Signal Modulation Bandwidth

Large aperture 850 nm VCSELs operating at bit rates up to 25 Gbit/s

Large aperture 850 nm VCSEL operating at 28 Gbit/s

Diffraction loss in long-wavelength buried tunnel junction VCSELs analyzed with a hybrid coupled-cavity transfer-matrix model

Mode and polarization control in VCSELs using shallow surface structures

Spatio-temporal turn-on dynamics of grating relief VCSELs

High Frequency Modulation and Bandwidth Limitations of GaInNAs Double Quantum Well Lasers

WCDMA radio-over-fibre transmission experiment using singlemode VCSEL and multimode fibre

High power single mode VCSELs for emerging applications

Design and evaluation of fundamental mode and polarization stabilized VCSELs with a sub-wavelength surface grating

VCSELs for microwave fiber optic links

Dynamic mode stability analysis of single-mode VCSELs using a shallow surface relief

Mode and Polarization Control in VCSELs using Surface Structures

Efficient and individually controllable mechanisms for mode and polarization selection in VCSELs, based on a common, localized, sub-wavelength surface grating

High-power fundamental-mode and polarization stabilized VCSELs using a sub-wavelength surface grating

Sub-Wavelength Surface Grating Application for High-Power Fundamental-Mode and Polarization Stabilization of the VCSELs

High-power single-mode and polarization stabilized VCSELs using a sub-wavelength surface grating

High Frequency Modulation and Bandwidth Limitations of GaInNAs Double Quantum Well Lasers

Dynamic mode stability analysis of surface relief VCSELs under strong RF modulation

Experimental Study of the Combined Mode and Polarization Control in VCSELs with a Sub-Wavelength Surface Grating

Direct high-frequency modulation of VCSELs and applications to fibre optic RF and microwave links

Single fundamental mode output power exceeding 6 mW from VCSELs with a shallow surface relief

Dynamic behavior of fundamental-mode stabilized VCSELs using a shallow surface relief

Broadband direct modulation of VCSELs and applications in fiber optic RF links