A5028689835- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Laser Applications
- Chemical Synthesis and Analysis
- Solid State Laser Technologies
- Carbohydrate Chemistry and Synthesis
- Advanced Fiber Laser Technologies
- Crystallization and Solubility Studies
- Luminescence Properties of Advanced Materials
- X-ray Diffraction in Crystallography
- Radiation Detection and Scintillator Technologies
- Advanced Semiconductor Detectors and Materials
- Chemical Synthesis and Reactions
- Natural product bioactivities and synthesis
- Asymmetric Synthesis and Catalysis
- Laser Design and Applications
- Synthetic Organic Chemistry Methods
- Chromatography in Natural Products
- Glass properties and applications
- Traditional and Medicinal Uses of Annonaceae
- Laser-Matter Interactions and Applications
- Perovskite Materials and Applications
- Plant biochemistry and biosynthesis
- Asymmetric Hydrogenation and Catalysis
Institute of Semiconductors
2022-2025
Chinese Academy of Sciences
2010-2025
University of Chinese Academy of Sciences
2022-2025
Hebei University
2019
Zhejiang University
2009-2011
Shanghai Institutes for Biological Sciences
2010
Shanghai Institute of Materia Medica
2010
Abstract Power scaling in conventional broad-area (BA) lasers often leads to the operation of higher-order lateral modes, resulting a multiple-lobe far-field profile with large divergence. Here, we report an advanced sawtooth waveguide (ASW) structure integrated onto wide ridge waveguide. It strategically enhances loss difference between modes and fundamental mode, thereby facilitating high-power narrow-beam emission. Both optical simulations experimental results illustrate significant...
Antimonide laser diodes, with their high performance above room temperature, exhibit significant potential for widespread applications in the mid-infrared spectral region. However, laser’s significantly degrades as emission wavelength increases, primarily due to severe quantum-well hole leakage and non-radiative recombination. In this paper, we put up an active region a valence band offset excellent crystalline quality luminescence improve performance. The miscibility gap of InGaAsSb alloy...
Abstract Thanks to high performance above room temperature, antimonide laser diodes have shown great potential for broad application in the mid-infrared spectral region. However, laser`s noticeably deteriorates due reduction of carrier confinement with increased emission wavelength. In this paper, a novel active region higher confinements both electron and hole, by usage an indirect bandgap material Al 0.5 GaAs 0.04 Sb as quantum barrier, was put up address poor GaSb-based type-I...
A novel and efficient process for the synthesis of α-sialyl spirohydantoin analogues via one-pot sequential reaction involving various carbodiimides peracetylated Neu5Ac is reported. BF3·Et2O mediating intramolecular N-sialylation with excellent α-selectivity first demonstrated.
Dracorhodin is a major constituent found in "Dragon's blood" resin of Daemonorops draco Willd. Blume. This natural flavylium compound potent pharmaceutical substance due to its biological and pharmacological activities such as antimicrobial, antiviral, antitumor cytotoxic activity. An effective high-speed counter-current chromatography method was successfully established for the isolation purification dracorhodin directly from extract D. by using two-phase solvent system composed...
We report on a GaSb-based superluminescent diode optimized for high-power broadband operation around wavelength of 2 μm. The high optical power was achieved by the high-quality epitaxial InGaSb/AlGaAsSb type-I quantum well gain material, which processed into double-pass amplification configuration. To prevent lasing at current injection while enabling strong amplified spontaneous emission, cascade cavity suppression waveguide geometry designed to connect vertical rear facet with...
We propose a novel graded AlGaAsSb layer growth method to achieve super-linear interface by precisely controlling the cell temperature and valve position. Atomically smooth surface lattice-matched epitaxy was confirmed AFM HRXRD characterization of sample. With inserted between cladding waveguide layers, high-power, high-efficiency GaSb-based laser emitters bars were confirmed. The linearly smooths potential barrier peak which resulted in low turn-on voltage 0.65 V an ultra-low series...
In this paper, we put up a robust design of stable single-mode-operated GaSb-based laser diode emitting around 1950nm. This novel structure with socketed ridge-waveguide enables simple fabrication and batch production mid-infrared diodes on account the mere usage standard photolithography. By introducing micron-level index perturbations distributed along ridge waveguide, threshold gains different FP modes are modulated. Four geometrical parameters systematically optimized by analyzing...
A rapid and stable method consisting of high‐performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry was established for the identification differentiation common diastereoisomeric ursane‐type triterpenoids at C‐3 position. Two characteristic fragment ions, [M–H–H 2 O–CO ] – O–HCOOH] , exhibited significant stereochemical effects were utilized to distinguish 3‐OH epimers. Based on reference standards, abundance ion in 3β‐OH compounds MS 3 experiment...
GaSb-based single-transverse-mode narrow ridge waveguide (RW) lasers with high power and simultaneous good beam quality have broad application prospects in the mid-infrared wavelength region. Yet its design formation not been investigated systematically, while characteristics that affect their suitability for specific applications remain rarely analyzed optimized. The present work addresses these issues by theoretically establishing a parameter domain generalizes overall possible...
A practically feasible, diastereoselective conjugate addition-elimination reaction of a chiral nickel(II) complex glycine 1 with allylic acetates 2 is described. The pathway was successfully controlled, and the desired formation carbon-carbon bond exclusively obtained high diastereoselectivity. This an attractive route for asymmetric synthesis previously unavailable chainlike glutamic acid derivatives.
A 3-aminoaspartate ester was synthesized by a highly enantio- and diastereoselective Mannich reaction of chiral nickel(II) complex Schiff base glycine with an N-(p-methoxyphenyl)-protected α-imino in the presence 1,8-diazabicyclo[5.4.0]undec-7-ene dichloromethane at room temperature. This procedure leads to products up 99% diastereomeric excess excellent yields.
Antimonide semiconductor laser diodes with high brightness are ideal light sources for a variety of applications. However, the traditional structure broad-area (BA) lasers high-power output is normally accompanied by multi-lobed far field profile and large lateral divergence. In this paper, we put up an on-chip microstructure mode filtering. The excellent control capability doubly confirmed optical simulations complete device measurements. optimized shows enhanced continuous-wave power in...
As one of the primary products in field semiconductor lasers, GaAs-based laser devices with an 808nm wavelength are widely applied various industries such as industrial, medical, and scientific research. These possess substantial market potential. This paper reports on development a high-power array device emitting at wavelength, achieved by our research team. At temperature 25°C, filling factor 30% injection current 50A, maximum output power reaches 55.31W, photoelectric conversion...
Abstract: We reported on a single-longitudinal-mode operated distributed Bragg reflector laser diode emitting at 1950 nm with an on-chip integrated power amplifier. Second-order Chromium–Bragg gratings are carefully designed and fabricated the end of ridge waveguide. Achieving stable single-mode operation large injecting current range 800 mA from 15 °C to 40 °C. The maximum side-mode suppression ratio (SMSR) is up 42 dB. To increase output power, master oscillator amplifier (MOPA) also...
Antimony laser diodes emitting at 2 μm have shown great potential due to the extraordinary performance in gas detecting and other promising fields. However, it is difficult increase power of antimony diodes, applications which would be restricted greatly. In this paper, we report watt-level developed by our group, maximum output can achieve about 1.082W 20℃ with injection current set as 5A, showing excellent performance.