Green-to-red tunable SHG of a quantum-dot laser in a PPKTP waveguide

Fedorova, Ksenia A.; Sokolovskiĭ, G. S.; Battle, Philip; Livshits, D.A.; Rafailov, Edik U.

doi:10.7452/lapl.201210085

Cited by 25 publications

(25 citation statements)

References 28 publications

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“…The high-order fundamental and low-order SHG modes are attributed to the frequency doubling on the red side of the tuning range. These results are in excellent agreement with a multimode interaction model very recently presented in [27]. With respect to applications, a Gaussian beam profile is mandatory.…”

Section: Broadly Tunable Frequency-doubled Ec-qd Laserssupporting

confidence: 78%

“…The generated fundamental emission from the gain chip output facet is then focused by high-NA optics into a periodically poled potassium titanyl phosphate (PPKTP) waveguide. To provide a large wavelength range for frequency conversion from a single crystal, a generalization of quasiphase matching (QPM) based on the utilization of a significant difference in the effective refractive indices of the high-and low-order modes in multimode waveguides is studied and realized [27]. This novel approach allows matching the period of poling in a very broad wavelength range and opens up a new avenue for an order-of-magnitude increase in SHG conversion bandwidth with respect to QPM.…”

Section: Broadly Tunable Frequency-doubled Ec-qd Lasersmentioning

confidence: 99%

“…With respect to applications, a Gaussian beam profile is mandatory. However, the observed multilobe output can be compensated by reshaping the output beam in a multimode fiber that allows for an effective transformation of the high-order mode into the Gaussian-shaped beam with M 2 values below 3 [27]. By utilizing a grating-coupled tailored gain chip with broad gain bandwidth, the continuous tunability wavelength range with simultaneous high power has been extended beyond the state-of-the-art to 178 nm across the spectral wavelength range of 1130-1308 nm.…”

Section: Broadly Tunable Frequency-doubled Ec-qd Lasersmentioning

confidence: 99%

“…Schematic experimental setup of a grating-coupled EC-QDL for the generation of high-power broadly tunable fundamental and frequency-doubled CW laser emission exploiting the broad gain bandwidth of spectrally broadened QD active region[27].…”

mentioning

confidence: 99%

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Ultra‐Short‐Pulse QD Edge‐Emitting Lasers

Breuer

Syvridis

Рафаилов

2014

The Physics and Engineering of Compact Quantum Dot‐based Lasers for Biophotonics

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IntroductionHigh-power, electrically pumped edge-emitting monolithic semiconductor lasers based on InAs/GaAs quantum dots (QDs) offer significant advantages including ultra-short pulse generation due to ultrafast gain and absorption recovery [1, 2] and emission energies in the near-infrared spectral range [3]. Owing to their inherent inhomogeneous QD size distribution, a broadening of gain and absorption profile is realized, leading to broadband wavelengths emission. This inhomogeneous broadening together with ultrafast carrier dynamics is particularly advantageous for ultrafast applications including the generation, propagation, and amplification of subpicosecond optical pulses with high pulse peak power [4] and the generation of spectrally tunable emission [5,6]. The reduced density of states allows for the exploitation of QD materials in harnessing spectral versatility in novel dual-state emission. The spectral coverage of these QD lasers perfectly matches a wide range of relevant biophotonic applications including nonlinear excitation imaging techniques. The unique combination of efficient light generation, ultrafast carrier dynamics, and broadband gain bandwidth can deliver exclusive advantages in ultrafast microelectronic scale components, thereby stimulating major advances in ultrafast science and technology.In order to enable initial device design and optimization of novel pulse generating QD lasers and amplifiers, a new and efficient theoretical framework is presented as briefly introduced in Section 2.2. This framework takes into account specifically fundamental aspects associated with QD gain materials and allows for modeling of both continuous-wave (CW) emission and ultra-short pulse generation via passive mode-locking (PML) and subsequent amplification. The obtained understanding is applied to technologically realize and optimize QD laser and amplifier structures with particularly broad gain bandwidth enabling spectral versatility through broadband tunability of CW-emission generated in the visible wavelength range by second-harmonic-generation (SHG). This broad wavelength range is accessible only by the QD features as presented in Section 2.3. Novel functionalities based on the broad gain bandwidth and sophisticated QD laser design are explored inThe Physics and Engineering of Compact Quantum Dot-based Lasers for Biophotonics, First Edition. Edited by Edik U. Rafailov.

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Section: Broadly Tunable Frequency-doubled Ec-qd Laserssupporting

confidence: 78%

Section: Broadly Tunable Frequency-doubled Ec-qd Lasersmentioning

confidence: 99%

Section: Broadly Tunable Frequency-doubled Ec-qd Lasersmentioning

confidence: 99%

mentioning

confidence: 99%

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Ultra‐Short‐Pulse QD Edge‐Emitting Lasers

Breuer

Syvridis

Рафаилов

2014

The Physics and Engineering of Compact Quantum Dot‐based Lasers for Biophotonics

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“…This 73 nm tunability (not continuous) was achieved by exploiting both the broadband tunability of the fundamental radiation allowed by a multimode QD laser, along with the quasi−phase matching in a multimode waveguided periodically−poled KTP and tapping into the significant difference in the effective refractive indices of the higher and lower−order modes [71], as previously demonstrated in [72]. A maximum power of 12 mW was achieved at 605.6 nm, with an efficiency of 10.3%.…”

Section: Applicationsmentioning

confidence: 92%

Unlocking Spectral Versatility from Broadly−Tunable Quantum−Dot Lasers

White

Cataluna

2015

Photonics

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Wavelength−tunable semiconductor quantum−dot lasers have achieved impressive performance in terms of high−power, broad tunability, low threshold current, as well as broadly tunable generation of ultrashort pulses. InAs/GaAs quantum−dot−based lasers in particular have demonstrated significant versatility and promise for a range of applications in many areas such as biological imaging, optical fiber communications, spectroscopy, THz radiation generation and frequency doubling into the visible region. In this review, we cover the progress made towards the development of broadly−tunable quantum−dot edge−emitting lasers, particularly in the spectral region between 1.0-1.3 µm. This review discusses the strategies developed towards achieving lower threshold current, extending the tunability range and scaling the output power, covering achievements in both continuous wave and mode−locked InAs/GaAs quantum−dot lasers. We also highlight a number of applications which have benefitted from these advances, as well as emerging new directions for further development of broadly−tunable quantum−dot lasers.

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