Hongwei Chu
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View article: Defect‐Free Sb‐Doping in Bi <sub>2</sub> O <sub>2</sub> Se Achieves Two‐Order‐of‐Magnitude Reduction in Saturation Intensity While Preserving High Carrier Mobility
Defect‐Free Sb‐Doping in Bi <sub>2</sub> O <sub>2</sub> Se Achieves Two‐Order‐of‐Magnitude Reduction in Saturation Intensity While Preserving High Carrier Mobility Open
Doping generally introduces performance trade‐offs in materials, yet overcoming this fundamental limitation remains crucial for advancing materials research. Bi 2 O 2 Se exhibits exceptional electronic properties as a promising semiconduct…
View article: 1860-nm polarization-maintaining figure-of-9 mode-locked fiber laser and optimization of its output characteristics
1860-nm polarization-maintaining figure-of-9 mode-locked fiber laser and optimization of its output characteristics Open
A thulium-doped conventional-soliton mode-locked fiber laser was demonstrated by applying an all-polarization-maintaining (PM) figure-of-9 (Fo9) nonlinear amplified loop mirror (NALM) configuration. This fiber laser can generate stable 186…
View article: Activated Self‐Trapped Excitons via Sb<sup>3+</sup> Doping in Lead‐Free Perovskite Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> for Enhanced Nonlinear Optics and Ultrafast Mode‐Locking Operation (Advanced Optical Materials 28/2025)
Activated Self‐Trapped Excitons via Sb<sup>3+</sup> Doping in Lead‐Free Perovskite Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> for Enhanced Nonlinear Optics and Ultrafast Mode‐Locking Operation (Advanced Optical Materials 28/2025) Open
View article: Oxygen vacancy-driven bandgap tuning and ultrafast laser performance in Bi <sub>2</sub> O <sub>2</sub> Se
Oxygen vacancy-driven bandgap tuning and ultrafast laser performance in Bi <sub>2</sub> O <sub>2</sub> Se Open
Bi 2 O 2 Se, with its excellent air stability, high mobility, and tunable bandgap, shows great potential for photonic modulators. This study proposes vacancy engineering as an effective method to refine its optical properties and enhance t…
View article: Nonlinear optical properties of perovskite-type oxide La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3−<i>δ</i></sub> for ultrafast photonic applications
Nonlinear optical properties of perovskite-type oxide La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.2</sub>Fe<sub>0.8</sub>O<sub>3−<i>δ</i></sub> for ultrafast photonic applications Open
We successfully synthesized a nonlinear optical material of perovskite-type oxide La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3− δ (LSCF) with the sol-gel method. The nonlinear optical properties and the potential for ultrafast pulse generation are inve…
View article: Activated Self‐Trapped Excitons via Sb<sup>3+</sup> Doping in Lead‐Free Perovskite Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> for Enhanced Nonlinear Optics and Ultrafast Mode‐Locking Operation
Activated Self‐Trapped Excitons via Sb<sup>3+</sup> Doping in Lead‐Free Perovskite Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> for Enhanced Nonlinear Optics and Ultrafast Mode‐Locking Operation Open
Lead‐free zero‐dimensional (0D) metal halide perovskites have garnered considerable research interest owing to their pronounced self‐trapped exciton emission and exceptional stability. In this study, micron‐sized particulate Cs 3 Cu 2 I 5 …
View article: PdX<sub>2</sub> (X = S, Se) saturable absorbers for passively Q-switched Er:YAP laser at 3 μm
PdX<sub>2</sub> (X = S, Se) saturable absorbers for passively Q-switched Er:YAP laser at 3 μm Open
In this work, two-dimensional (2D) PdX 2 (X = S, Se) nanosheets were successfully fabricated via the ultrasound-assisted liquid-phase exfoliation (LPE) method and characterized comprehensively. Employing open-aperture (OA) Z/I-scan techniq…
View article: Two-dimensional violet phosphorus as a broadband saturable absorber for mid-infrared photonics
Two-dimensional violet phosphorus as a broadband saturable absorber for mid-infrared photonics Open
Two-dimensional (2D) violet phosphorus (VP), a recently investigated 2D semiconductor material, is promising for advanced optoelectronic applications because of its distinct physical and chemical features. In this work, high-quality, few-l…
View article: Diode-pumped Tm:CALGO lasers operating on the <sup>3</sup>H<sub>4</sub> → <sup>3</sup>H<sub>5</sub> transition
Diode-pumped Tm:CALGO lasers operating on the <sup>3</sup>H<sub>4</sub> → <sup>3</sup>H<sub>5</sub> transition Open
The performance of the diode-pumped Tm:CALGO laser operating on the 3 H 4 → 3 H 5 Tm 3+ transition was studied in detail by employing the crystals with different Tm 3+ doping levels in the range of 1.5 at.% to 5 at.%, and Watt-level contin…
View article: Ultra‐High Temperature Calcination of Crystalline α‐Fe<sub>2</sub>O<sub>3</sub> and Its Nonlinear Optical Properties for Ultrafast Photonics
Ultra‐High Temperature Calcination of Crystalline α‐Fe<sub>2</sub>O<sub>3</sub> and Its Nonlinear Optical Properties for Ultrafast Photonics Open
As a typical transition metal oxide, α‐Fe 2 O 3 has garnered significant attention due to its advantages in nonlinear optical applications, such as strong third‐order nonlinearity and fast carrier recovery time. To delve into the nonlinear…
View article: Growth, spectroscopy and laser operation of disordered Tm,Ho:NaGd(MoO4)2 crystal
Growth, spectroscopy and laser operation of disordered Tm,Ho:NaGd(MoO4)2 crystal Open
View article: Frequency-comb-referenced multiwavelength interferometry for high-precision and high-speed 3D measurement in heterogeneous semiconductor packaging
Frequency-comb-referenced multiwavelength interferometry for high-precision and high-speed 3D measurement in heterogeneous semiconductor packaging Open
As Moore’s law approaches its physical limits, the semiconductor industry has begun to focus on improving I/O density and power efficiency through 2.5D/3D packaging. Heterogeneous integration, which combines integrated circuit blocks from …
View article: Crystal growth, spectral properties, and 2.3 µm continuous-wave laser operation of Tm:YScO<sub>3</sub> and Tm:LuScO<sub>3</sub> crystals
Crystal growth, spectral properties, and 2.3 µm continuous-wave laser operation of Tm:YScO<sub>3</sub> and Tm:LuScO<sub>3</sub> crystals Open
Tm 3+ -doped sesquioxides, Tm:YScO 3 , and Tm:LuScO 3 crystals, were successfully fabricated by using a laser floating zone method. For the first time, continuous-wave laser operation at 2.3 µm on the 3 H 4 → 3 H 5 Tm 3+ transition of the …
View article: Oxygen Vacancy-Driven Bandgap Tuning and Ultrafast Laser Performance in Bi2O2Se
Oxygen Vacancy-Driven Bandgap Tuning and Ultrafast Laser Performance in Bi2O2Se Open
View article: 2D Transition Metal Carbo‐Chalcogenide Nb<sub>2</sub>CSe<sub>2</sub>: A Combination of Transition Metal Dichalcogenide and MXene for Ultrafast Photonics Application
2D Transition Metal Carbo‐Chalcogenide Nb<sub>2</sub>CSe<sub>2</sub>: A Combination of Transition Metal Dichalcogenide and MXene for Ultrafast Photonics Application Open
Transition metal carbo‐chalcogenides (TMCCs), a novel class of 2D materials, combining the distinctive properties of transition metal dichalcogenides (TMDs) and MXenes, eliciting considerable interest for their excellent properties across …
View article: Nonlinear optical properties of lead halide perovskite CsPbBr<sub>3</sub> for ultrafast pulse generation
Nonlinear optical properties of lead halide perovskite CsPbBr<sub>3</sub> for ultrafast pulse generation Open
Halide perovskites have attracted much attention in the field of nonlinear optics due to their strong quantum constraint, obvious exciton effect, and structural diversity. In this paper, lead halide perovskite CsPbBr 3 nanocrystals were sy…
View article: Surface oxygen vacancies in amorphous Fe2O3 tailored nonlinear optical properties for ultrafast photonics
Surface oxygen vacancies in amorphous Fe2O3 tailored nonlinear optical properties for ultrafast photonics Open
Fe2O3 nanomaterials, as one of the transition metal oxides (TMOs) materials, have garnered attention in ultrafast photonics due to their robust third-order nonlinearity, rapid carrier recovery time, high stability, broad absorption bandwid…
View article: Sub-Nanosecond Single Mode-Locking Pulse Generation in an Idler-Resonant Intracavity KTA Optical Parametric Oscillator Driven by a Dual-Loss-Modulated Q-Switched and Mode-Locked Laser with an Acousto-Optic Modulator and MoWS2
Sub-Nanosecond Single Mode-Locking Pulse Generation in an Idler-Resonant Intracavity KTA Optical Parametric Oscillator Driven by a Dual-Loss-Modulated Q-Switched and Mode-Locked Laser with an Acousto-Optic Modulator and MoWS2 Open
The synthesis of 2D MoWS2 nanosheets involved the liquid-phase exfoliation technique was explored in this paper. The nonlinear optical response of MoWS2 was characterized in the 1 µm wavelength range, and its suitability as a saturable abs…
View article: Polarized, broadly tunable, 2.3 µm continuous-wave laser operation of Tm<sup>3+</sup>-vanadate crystals
Polarized, broadly tunable, 2.3 µm continuous-wave laser operation of Tm<sup>3+</sup>-vanadate crystals Open
We report for the first time the polarized, broadly tunable, continuous-wave laser operation on the 3 H 4 → 3 H 5 transition in Tm 3+ -vanadate (Tm:REVO 4 , RE = Gd, Y, Lu) crystals. Continuous wavelength tunings with tuning widths of abou…
View article: High-power idler-resonant intracavity KTA OPO driven by a dual-loss-modulated Q-switched mode-locked laser with AOM and Sb<sub>2</sub>Te<sub>3</sub> nanosheets
High-power idler-resonant intracavity KTA OPO driven by a dual-loss-modulated Q-switched mode-locked laser with AOM and Sb<sub>2</sub>Te<sub>3</sub> nanosheets Open
By using Sb 2 Te 3 nanosheets as saturable absorbers (SA) and an acousto-optic modulator (AOM), a laser-diode (LD) end-pumped idler-resonant KTiOAsO 4 (KTA)-based intracavity optical parametric oscillator (IOPO) pumped by a dual-loss-modul…
View article: Copper Functionalized SnSe Nanoflakes Enabling Nonlinear Optical Features for Ultrafast Photonics
Copper Functionalized SnSe Nanoflakes Enabling Nonlinear Optical Features for Ultrafast Photonics Open
This study enhances the ultrafast photonics application of tin selenide (SnSe) nanoflakes via copper (Cu) functionalization to overcome challenges such as low conductivity and weak near‐infrared (NIR) absorption. Cu functionalization enhan…
View article: One‐Step Fabrication of 0D Cs<sub>4</sub>PbBr<sub>6</sub> Perovskite with Nonlinear Optical Properties for Ultrafast Pulse Generation
One‐Step Fabrication of 0D Cs<sub>4</sub>PbBr<sub>6</sub> Perovskite with Nonlinear Optical Properties for Ultrafast Pulse Generation Open
Low‐dimensional lead halide perovskites demonstrate remarkable nonlinear optical characteristics attributed to their distinctive physical structures and electronic properties. Nevertheless, the investigation into their nonlinear optical pr…
View article: Crystal growth, polarized spectral properties, and 2.3 µm laser performance of Tm:LuVO<sub>4</sub> crystal
Crystal growth, polarized spectral properties, and 2.3 µm laser performance of Tm:LuVO<sub>4</sub> crystal Open
We report on the Czochralski crystal growth, polarized optical spectroscopy, and the first continuous-wave laser operation of 1.5 at.% Tm:LuVO 4 crystal on the 3 H 4 → 3 H 5 transition. The polarized absorption and stimulated-emission prop…
View article: Polarized spectral properties and 2.3 µm laser performance of the Tm:YVO<sub>4</sub> crystal
Polarized spectral properties and 2.3 µm laser performance of the Tm:YVO<sub>4</sub> crystal Open
The polarized spectral properties and ∼2.3 µm high-power continuous-wave laser operation of Tm 3+ -doped yttrium orthovanadate crystal (Tm:YVO 4 ) are reported. For the 3 H 4 → 3 H 5 transition, the stimulated-emission cross-section σ SE i…
View article: Ultrafast nonlinear optical response of layered violet phosphorus for femtosecond noise-like pulse generation
Ultrafast nonlinear optical response of layered violet phosphorus for femtosecond noise-like pulse generation Open
As a new member of two-dimensional (2D) phosphorene, 2D layered violet phosphorus (VP) has unique optoelectronic properties and good environmental stability, showing its huge advantages in optoelectronic applications. In this paper, the ul…
View article: Preparation of amorphous silicon-doped Y<sub>2</sub>O<sub>3</sub> aerogel enabling nonlinear optical features for ultrafast photonics
Preparation of amorphous silicon-doped Y<sub>2</sub>O<sub>3</sub> aerogel enabling nonlinear optical features for ultrafast photonics Open
Amorphous aerogels with the microscopic nanoscale three-dimensional meshes provide superb platforms for investigating unique physicochemical properties. In order to enhance the physical, thermal and mechanical performances, one efficient a…
View article: Diode-pumped Tm:YAP laser operating at 2.3 µm with enhanced performance through cascade lasing
Diode-pumped Tm:YAP laser operating at 2.3 µm with enhanced performance through cascade lasing Open
The laser diode (LD)-pumped Tm:YAP ( a -cut, 3.5 at.%) laser generated a maximum ∼2.3 µm continuous wave (CW) laser output power of ∼3 W. The higher output power benefited from the positive effect of the cascade lasing (simultaneously oper…
View article: Efficient high-power 2.3 μm continuous-wave laser operation of diffusion-bonded composite YVO<sub>4</sub>/Tm:GdVO<sub>4</sub> crystals
Efficient high-power 2.3 μm continuous-wave laser operation of diffusion-bonded composite YVO<sub>4</sub>/Tm:GdVO<sub>4</sub> crystals Open
We reported on an efficient high-power continuous-wave laser operation on the 3 H 4 → 3 H 5 transition of Tm 3+ ions in a diffusion-bonded composite YVO 4 /Tm:GdVO 4 crystal. Pumped by a laser diode at 794 nm, a maximum output power of 7.5…
View article: Porous Nano-Grained Cuprous Selenide (Cu2se) for Mid-Infrared Photonics
Porous Nano-Grained Cuprous Selenide (Cu2se) for Mid-Infrared Photonics Open
View article: Nanometer-Resolution White-Light Scanning Interferometry for Surface-Profiling of Hybrid Bonding Samples for Advanced Semiconductor Packaging
Nanometer-Resolution White-Light Scanning Interferometry for Surface-Profiling of Hybrid Bonding Samples for Advanced Semiconductor Packaging Open