A5100384938- Solid State Laser Technologies
- Luminescence Properties of Advanced Materials
- Advanced Fiber Laser Technologies
- Glass properties and applications
- Photorefractive and Nonlinear Optics
- Photonic Crystal and Fiber Optics
- Laser Design and Applications
- graph theory and CDMA systems
- Advanced ceramic materials synthesis
- Optical measurement and interference techniques
- Catalytic Processes in Materials Science
- Polynomial and algebraic computation
- Laser Material Processing Techniques
- Laser-Matter Interactions and Applications
- Microwave Dielectric Ceramics Synthesis
- Advanced Surface Polishing Techniques
- Optical properties and cooling technologies in crystalline materials
- Graph theory and applications
- Matrix Theory and Algorithms
- Optical Systems and Laser Technology
- Finite Group Theory Research
- Adaptive optics and wavefront sensing
- Non-Destructive Testing Techniques
- Power Transformer Diagnostics and Insulation
- Advanced Vision and Imaging
Jiangsu Normal University
2017-2023
Nanyang Technological University
2002-2021
Dalian University of Technology
2000
Highly transparent Y2O3 ceramics were successfully fabricated with CaO as sintering aid. The microstructure evolution, optical transmittance, hardness and thermal conductivity of the investigated. It was found that doping a small amount (0.01–0.15 wt.%) could greatly improve densification rate Y2O3. With an optimized dosage 0.02 wt.% combined low temperature vacuum plus hot isostatic pressing (HIP-ing), in-line transmittance 84.87% at 1200 nm 81.4% 600 obtained.
Abstract High‐efficiency Yb:Y 2 O 3 laser ceramics were fabricated using the vacuum‐sintering plus hot isostatic pressing (HIP) without sintering additives. High‐purity well‐dispersed nanocrystalline powder was synthesized a modified co‐precipitation method in‐house. The green bodies first vacuum sintered at temperature as low 1430°C and then HIPed 1450°C. Finally, samples air annealed 800°C for 10 h. Although no aids used, full density of with excellent optical homogeneity an inline...
Abstract We report on the direct comparison of single-crystal and ceramic Yb 3+ :Lu 2 0 3 gain media with respect to emission spectra, fluorescence lifetime, depolarization, laser performance in a continuous-wave thin-disk oscillator. The most efficient operation was achieved disk multimode slope efficiency 72.1% an average output power 997 W. At same temperature level, delivered 861 W 68.6%. In fundamental-mode operation, highest 360 optical 41.3% were obtained disk. For disk, limited 113...
Abstract We report on our recent progress of fabricating Yb 3+ ‐doped Lu 2 O 3 transparent ceramics for 1 μm solid‐state laser application. Well‐dispersed 3.3 at.% Yb:Lu nanopowders were synthesized using a co‐precipitation method. Without any sintering aids, the could be densified by vacuum at 1500°C/10 hours followed HIP ing 1480°C/4 hours. Such obtained had not only dense microstructure and submicron grain size about 0.6 μm, but also in‐line transmission 80.0% 600 nm. Preliminary...
Abstract Transparent 0.6 at% Nd:Y 2 O 3 ceramics were fabricated by vacuum sintering at 1550°C and hot isostatic pressing (HIP) 1540°C. The sintered such temperatures had good homogeneity with dense microstructures, without any residual pores secondary phases. in‐line transmittance reached 81.6% 1000 nm remained 81.1% 650 nm. Continuous wave (CW) laser operation of an uncoated ceramic slab was evaluated. A maximum output power 3.6 W slope efficiency 45.2% 1.08 μm obtained.
Efficient passively Q-switched Er:Y <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ceramic lasers operating at 2.7 μm were demonstrated. Using a semiconductor saturable absorber mirror (SESAM) of 2.4% modulation depth, we achieved 63 ns pulses that are close to the limit set by cavity length. For 9.5 W absorbed pump power, an average output power 0.88 was generated with pulse energy...
This paper reports on the influence of rapid rate sintering (RRS) densification and microstructure evolution yttria transparent ceramics by using vacuum sintering. The presence temperature gradient has been confirmed during RRS process. higher heating (HR), larger in samples would be. By RRS, e.g., HR = 40°C/min, could be densified very fast to a relative density 99.6%. However, these not further densified, due difference caused rate‐induced gradient. two‐step with an...
Abstract We report on the high-power and room temperature operation of an Er:Y 2 O 3 ceramic laser at ∼2.7 μ m based home-developed high optical quality samples. Pumped directly into upper level with a spectrally narrowed 976 nm diode beam shaped to have 1D top-hat profile, laser-generated 13.4 W CW output power slope efficiency 16.0% respect absorbed pump power. In modified resonator design, lasing 23.7% has been demonstrated. To our knowledge, this represents highest spectral region from...
We report on power scaling and efficient operation of a Ho:Y2O3 ceramic laser at 2.1 µm in-band pumped with an incoherently beam combined high narrow-linewidth Tm fiber source 1931.2 nm. The 0.5 at.% Ho3+ doped is fabricated in-house scattering loss < 0.25% cm-1. Up to 210.5 W continuous-wave output has been generated 2117 nm for 366 absorbed pump shaped one-dimensional top-hat profile, corresponding slope efficiency 60.0% respect the power. A 67.5% demonstrated 160 using circular...
High efficiency continuous-wave laser operation of an in-house made Nd:Y2O3 ceramic was demonstrated. The fabricated by vacuum sintering plus the hot isostatic pressing process, whose in-line transmittance reaches 81.6% at wavelength 1000 nm. 1.08 and 1.36 µm CW oscillation uncoated sample experimentally investigated. Both achieved highest slope output power so far reported for lasers. For 4F3/2-4I11/2 transitions, simultaneous oscillations 1074.6 nm 1078.8 were observed. At absorbed pump...
Abstract Highly pure and well‐dispersed yttria nanocrystalline powders were synthesized with a modified coprecipitation method that uses mixed ammonium hydroxide‐carbonate solution as the precipitant poly acrylic acid (PAA) dispersant. Comparing using same route but without PAA dispersant, PAA‐assisted exhibit lower level of agglomeration better sinterability. Sintering trajectories dispersant investigated. Y 2 O 3 ceramics sintered exhibited smaller grain size, homogeneous microstructure,...