Semiconductor disk lasers (VECSELs)

Hastie, Jennifer E.; Calvez, S.; Dawson, Martin D.

doi:10.1533/9780857096401.2.341

Cited by 6 publications

(6 citation statements)

References 207 publications

(115 reference statements)

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“…As expected, structures with less gallium and structures with wider quantum wells were found to emit further in the red. By contrast, the aluminum fraction in the barrier layer had little influence on the peak emission wavelength. , …”

Section: Results and Discussionmentioning

confidence: 92%

“…By contrast, the aluminum fraction in the barrier layer had little influence on the peak emission wavelength. 15 , 21 …”

Section: Results and Discussionmentioning

confidence: 99%

“…The starting point for the optimization was the wafer structure used in our previous work, , here referred to as Wafer A, consisting of 7 nm wide Ga 0.41 In 0.59 P wells and 10 nm Al 0.255 Ga 0.255 In 0.49 P barriers. Both an increase in well width and a decrease in the gallium content of the well are expected to lower the band gap and therefore to red-shift the photoluminescence. , On the other hand, lower gallium concentrations lead to a greater mismatch in lattice constant compared to the GaAs substrate, and the resulting compressive strain increases the risk of forming dislocations in the structure . Furthermore, reducing the aluminum content in the barrier lowers its band gap, which enables absorption of longer wavelengths, however with the drawback of reduced electron confinement in the well .…”

Section: Results and Discussionmentioning

confidence: 99%

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Red-Shifted Excitation and Two-Photon Pumping of Biointegrated GaInP/AlGaInP Quantum Well Microlasers

et al. 2022

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Biointegrated intracellular microlasers have emerged as an attractive and versatile tool in biophotonics. Different inorganic semiconductor materials have been used for the fabrication of such biocompatible microlasers, but often operate at visible wavelengths ill-suited for imaging through tissue. Here, we report on whispering gallery mode microdisk lasers made from a range of GaInP/AlGaInP multi-quantum well structures with compositions tailored to red-shifted excitation and emission. The selected semiconductor alloys show minimal toxicity and allow fabrication of lasers with stable single-mode emission in the NIR (675 -720 nm) and sub-pJ thresholds. The microlasers operate in the first therapeutic window under direct excitation by a conventional diode laser and can also be pumped in the second therapeutic window using two-photon excitation at pulse energies compatible with standard multiphoton microscopy. Stable performance is observed under cell culturing conditions for five days without any device encapsulation. With their biooptimized spectral characteristics, low lasing threshold and compatibility with two-photon pumping, AlGaInP-based microlasers are ideally suited for novel cell tagging and in vivo sensing applications.

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Section: Results and Discussionmentioning

confidence: 92%

“…By contrast, the aluminum fraction in the barrier layer had little influence on the peak emission wavelength. 15 , 21 …”

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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Red-Shifted Excitation and Two-Photon Pumping of Biointegrated GaInP/AlGaInP Quantum Well Microlasers

et al. 2022

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“…Vertical-external-cavity surface-emitting lasers (VECSELs), also referred to as semiconductor disk lasers (SDLs), have emerged at the frontier between solid-state and semiconductor laser technologies [1][2][3]. These high-brightness light sources combine the most important advantages of semiconductor and solid-state lasers: the possibility of engineering the emission wavelength of semiconductor gain media is combined with the high beam quality and functionality offered by external cavity architectures.…”

Section: Introductionmentioning

confidence: 99%

Optically pumped VECSELs: review of technology and progress

Guina

Rantamäki

Härkönen

2017

J. Phys. D: Appl. Phys.

205

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“…Optically pumped semiconductor disk lasers are an important class of solid-state lasers. − Despite all their advantages, they suffer from heat incorporation into the active region caused by the excess energy of the pump photons. To overcome the limits of common methods in thermal management, we have realized a semiconductor membrane external-cavity surface-emitting laser (MECSEL) consisting of a diamond heat spreader sandwiched active region design without monolithically integrated distributed Bragg reflectors (DBRs), which is commonly used in semiconductor disk lasers.…”

mentioning

confidence: 99%

Direct Imaging of the Carrier Capture into Individual InP Quantum Dots of a Semiconductor Disk Laser Membrane

et al. 2022

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We report on nanoscopic exploration of the luminescence from individual InP quantum dots (QDs) by means of highly spatially resolved cathodoluminescence (CL) spectroscopy directly performed in a scanning transmission electron microscope (STEM). A 7-fold layer stack with highdensity InP quantum dots is embedded as an active medium membrane in an external-cavity surface-emitting laser. We characterize the vertical transfer of carriers within the periodic separate confinement heterostructure and determine the capture efficiency of carriers from the cladding layer into the quantum dot layers. Benefiting from the nanoscale resolution of our STEM-CL, we perform single-dot spectroscopy on single isolated QDs in the STEM lamella resolving the details of the excitonic structure of individual quantum dots. Executing highly spatially resolved spectrum line scans within the QD layers, we directly visualize the lateral transport, i.e., the efficient lateral capture of carriers into an individual QD. We observe a characteristic change of the spectral fingerprint during this line scan, while the electron beam is approaching and subsequently receding from the quantum dot position. This directly correlates to the increase and decrease of the numbers of excess carriers reaching the dot, i.e., altering the quantum dot population. The characteristic shift of emission energies visualize the renormalization of the ground-state energy of the single dot, and the intensity ratio of the excitonic recombinations verifies this change of the occupation and the state-filling.

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Semiconductor disk lasers (VECSELs)

Cited by 6 publications

References 207 publications

Red-Shifted Excitation and Two-Photon Pumping of Biointegrated GaInP/AlGaInP Quantum Well Microlasers

Red-Shifted Excitation and Two-Photon Pumping of Biointegrated GaInP/AlGaInP Quantum Well Microlasers

Optically pumped VECSELs: review of technology and progress

Direct Imaging of the Carrier Capture into Individual InP Quantum Dots of a Semiconductor Disk Laser Membrane

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