A5101678892- Solid State Laser Technologies
- Laser Design and Applications
- Advanced Fiber Laser Technologies
- Photorefractive and Nonlinear Optics
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Spectroscopy and Laser Applications
- Optical Wireless Communication Technologies
- Luminescence Properties of Advanced Materials
- Orbital Angular Momentum in Optics
- Photonic and Optical Devices
- Gyrotron and Vacuum Electronics Research
- TiO2 Photocatalysis and Solar Cells
- Microwave Engineering and Waveguides
- Advanced Photocatalysis Techniques
- Transition Metal Oxide Nanomaterials
- Gas Sensing Nanomaterials and Sensors
- Electromagnetic Simulation and Numerical Methods
- Quantum Dots Synthesis And Properties
- Advanced Sensor and Energy Harvesting Materials
- Crystallography and molecular interactions
- Plasmonic and Surface Plasmon Research
- Laser-Matter Interactions and Applications
- Photonic Crystals and Applications
- Laser Material Processing Techniques
Capital Normal University
2024-2025
Soochow University
2025
Huaiyin Institute of Technology
2013-2023
Harbin Institute of Technology
2010-2022
A diode-pumped single frequency Tm:YAG laser operating at 2 μm is demonstrated in this letter. The crystal controlled room temperature by using a thermoelectric cooler. Two solid uncoated fused silica etalons are employed to narrow the line-width, thicknesses of which 0.1 mm and 1 mm, respectively. By tuning angle etalons, achieved oscillating wavelength can be changed from 2008 nm 2021 nm. And each wavelength, single-frequency achieved. maximum power up 75.0 mW with central 2013.9 To our...
High power diode-pumped continuous wave (CW) and Q-switch operation of Tm,Ho:YVO4 laser is reported. Using two rods in a single cavity, up to 20.2 W CW output lasing at 2054.7 nm was obtained under cryogenic temperature 77 K with an optical conversion efficiency 32.9%. For operation, 19.4 15 kHz pulse repetition frequency (PRF) minimum width 24.2 ns. In addition, different frequencies 10.0 kHz, 12.5 15.0 were investigated comparatively.
We report the electrical conduction mechanism of amorphous titanium oxide thin films applied for bolometers. As O/Ti ratio varies from 1.73 to 1.97 measured by rutherford backscattering spectroscopy, resistivity increases 0.26 <svg style="vertical-align:-0.0pt;width:12.9875px;" id="M1" height="11.425" version="1.1" viewBox="0 0 12.9875 11.425" width="12.9875" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg"> <g...
ABSTRACT As a bonding material for the shell and propellant in combustion chamber of solid rocket motor, liner plays protective role engine. Only when is “semi‐solidified state” can charge quality be guaranteed, it easy to cause phenomenon unstable interface if loaded too early or late. Therefore, noncontact monitoring gradual solidification process from liquid state prevent problems significantly improve safety motors. In this paper, reflective terahertz time‐domain spectroscopy technology...
Abstract Solar thermoelectric generators (STEGs) that can effectively harvest solar energy and convert it into affordable electricity, provide a promising solution for self-powered wearable electronics the Internet of Things (IoT). However, their electricity generation is often limited by low thermal concentration or unstable temperature gradients in practical applications. Herein, we rationally designed an organic radical-activable charge-transfer (CT) cocrystal based on open-shell radical...
High power and high beam quality continuous wave Tm:YLF laser by the dual-end-pumped is presented in this letter. The highest output reaches 21.3 W when totally input pump 54.6 W. optical conversion efficiency 39.0% slope 47.3%. With an F-P etalon cavity, center wavelength tuned to 1908 nm with about 0.5 FWHM. optimal factor M 2 can be ∼ 1.1. As we know, our work first time investigate spectrum acquire near-diffraction limited output.
We report a single-longitudinal-mode CW diode-pumped Tm, Ho: YVO4 microchip laser emitting at both 2041.3 and 2054.6 nm. At each wavelength, the has single longitudinal mode. The total output power reaches 185 mW with 20.4% optical conversion efficiency 905 incident pump power.
We demonstrated a 1.91 μm pumped, injection-seeded Q-switched Ho:YAG laser operating at room temperature. By inserting two Fabry-Perot etalons into the cavity, single-frequency Tm, seed lasing was achieved wavelength of 2090.9 nm, with typical output power 60 mW. Single-frequency, nearly transform-limited operation by injection seeding. The energy pulse is 7.6 mJ, width 132 ns and repetition rate 100 Hz. measured spectrum, half-width which 3.5 MHz, heterodyne technique.
The hydrothermal performance of multiple semi-twisted tape inserts inside a heat exchanger pipe is numerically examined in three-dimensions. This study aims to find the optimum case for having highest transfer enhancement with lowest friction factor using nanofluid (Al2O3/water). A evaluation criterion (PEC) defined characterize based on both and transfer. It was found that increasing number tapes increases swirl flow streams leads an local Nusselt as well factor. average from 15.13 28.42...
In this paper we report on a laser diode end-pumped single longitudinal mode (SLM) and continuously tunable frequency Tm,Ho:YLF with high beam quality at room temperature. The maximal output power of is as 118 mW by using two uncoated fused silica etalons, which are respectively 0.1 mm 1 thick. Furthermore, the can be tuned over GHz only angle tuning thick etalon. used seed for coherent wind measurements differential absorption lidar systems.
An efficient 2 μm room-temperature Q-switched Ho:GdVO4 laser end-pumped by a 1942 nm Tm-fiber is demonstrated. To our knowledge, this the first report of performance crystal. A maximum CW output power 6.85 W under absorbed pump 24.1 was obtained with slope efficiency 39.5% at temperature 17°C. With same power, energy per pulse about 0.9 mJ and minimum width 4.7 ns were pulsed repetition frequency (PRF) 5 kHz, corresponding to peak approximately 187.2 kW.
Lasing characteristics of a diode-pumped injection seeded Tm,Ho:GdVO4 laser is presented in this letter. A Q-switched output energy as much 2 mJ at 20 Hz with pulse width 170 ns was obtained. Single-frequency, nearly transform-limited operation the achieved by seeded. The high power and beam quality make it well suited for use coherent wind lidar transmitter on space platform. To our knowledge, work first time to investigate injection-seeded achieve single-longitudinal-mode laser.
A room-temperature diode-end-pumped acousto-optical (AO) Q-switched Tm:GdVO4 laser was firstly reported. The minimum AO Q-switch pulse width measured to be about 48 ns with output power of 2 W and repetition rate 5 kHz. Continuous-wave 2.8 at 1912 nm obtained under the absorbed pump 15 W. In addition, widths ratio QCW power/CW different rates were discussed.
An efficient single-frequency laser-diode pumped, continuous wave (CW) ring Nd laser emitting at 1064.4 nm is demonstrated. A composite crystal (Nd:YVO4/YVO4) with undoped ends single end pumped by a fiber-coupled diode (LD) 808 nm. four-mirror cavity deigned to keep the unidirectional operating, which eliminate spatial hole burning in standing-wave cavity. With incident pump power of 31.5 W, obtained output 13.6 slope efficiency 52.6% and an optical 43.2%. At same time, beam quality M2 ∼ 1.1 found.
A high efficient, Q-switch, cryogenic operation of c-cut Tm (5 at.%),Ho(0.3 at.%):YAlO3 (YAP) laser was reported in this paper. In the temperature 77 K, Tm,Ho:YAP crystal double end-pumped by dual 7.25-W fiber-coupled diodes (LDs) at center wavelength 793.3 nm. 2.17-W Q-switch output power acquired pulse repetition frequency (PRF) 10 kHz, corresponding to an optical-optical conversion efficiency 15.0% and a slope 19.4%. The energy per 1.71 mJ 71 ns achieved 1.25 kHz with peak 24.1 kW.
Fluorescence spectroscopy attracted more and attention in pesticide residue detection field because of its advantages non-destructive, non-contact, high speed no requirement complex pre-process procedure. However, given that the concentration detected via fluorescence is calculated accordance with Beer-Lambert law, this method can only be used to detect samples containing a single kind or several kinds pesticides completely different which not practical cases. In article, overcome...
We reported the Ho:YAP laser pumped by Tm-doped fiber with a Bragg grating. The maximum output power was 3.94 W when incident 10.6 threshold of 2.54 W. slope efficiency 49%, corresponding to an optical-to-optical 37.1%. wavelength centered at 2117.9 nm bandwidth about 2 nm.
We report a diode-pumped CW Tm:YLF laser at room temperature with volume Bragg grating (VBG) instead of the conventional mirror. The operated 1909.5 nm output power 6.0 W. optical-to-optical conversion efficiency is 25.7% and slope 37.4%. Also, stable narrow linewidth less than 0.3 FWHM are achieved.
Lasing characteristics of a CW Tm:LuAG with set double cavity is presented in this letter. As the air gap etalon keeping at 342 μm, highest output power reaches 107.8 mW when totally input pump 1.95 W. The center wavelength 2027.0 nm. A single longitude mode 17.1 obtained incident 855.1 mW. With changing DC voltage on Piezoelectric Transducer (PZT) holding coupler, reflection effective mirror changes correspondingly. oscillating shifts from 2022 nm to 2031 To our knowledge, work first time...
Widely tunable performances of Tm:YAG and Tm:LuAG lasers near 2 μm are demonstrated. The emission spectra Tm3+ in these two single crystals reported analyzed. lifetimes the 3 F 4 state thulium-doped YAG LuAG 10.1 9.2 ms, respectively. In addition, it is proven that crystal with bonded undoped ends promising for high-efficient operation.