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A THz laser source based on stimulated polariton scattering (SPS) in an intracavity RbTiOPO4 (RTP) crystal is reported, with frequency-tunable output from 3.10 to 3.16 THz and from 3.50 to 4.15 THz. The gap exhibited from 3.17 to 3.49 THz is located in the vicinity of the 104 cm−1 absorbing mode in RTP. A maximum average output power of 16.2 μW was measured at 3.80 THz.
Broad green generation from 500 to 565nm was observed on chirped χ(2) nonlinear photonic crystals made of periodically-poled lithium tantalate (PPLT) with single pass up-conversion efficiency ∼10%. This was ascribed to simultaneous multi-wavelength SHG and SFG due to nonlinear interaction of (signal, idler) waves in the adiabatically chirped PPLT.
We are developing a 3D positioning positron emission tomography (PET) detector module made up of dense stacks of 0.5 mm × 0.5 mm × 1.0 mm LYSO scintillation crystal elements coupled to position sensitive solid state photomultipliers (PS-SSPMs.) In this work, crystal arrays with four different types of outer face reflectors were tested to investigate the effect of outer reflectors on crystal identification...
In our previous works, we had investigated a pulse width modulation (PWM) based multiplexing readout for a detector that is built from dense stacks of LYSO scintillation crystal elements coupled to position sensitive solid state photomultipliers (PS-SSPMs). In our readout system, each of the PS-SSPM position channel signals are integrated for a set time to obtain event energy and position. In this...
We developed an X-ray imager using Yttrium OxyorthoSilicate (Y2SiO5:Ce, YSO) scintillating crystal array and Multi-Anode PhotoMultiplier Tubes (MAPMTs) with the capability of fast X-ray counting and X-ray energy measurement. YSO scintillating crystal array has many advantages. First of all, there is no intrinsic background. We can detect the low energy X-ray photon without internal noise. The X-ray...
We have successfully grown pure and Pr3+-doped NaGd(WO4)2 (NGW) single crystals using the Czochralski pulling method. By employing a suitable rotation and pulling rates, good quality crystals of pure and Pr3+-doped NGW have been grown from the solution melt. Structural analyses of the grown samples are studied by X-ray diffraction (XRD). The x-ray induced emission spectrum shows a broad emission band...
THz radiation promises a number of revolutionary applications in fields ranging from security and counter terrorism to medicine and agriculture. In most of these applications, it is often the unique penetrative and absorption properties of THz radiation that are used either for imaging or spectroscopic identification of materials/areas of interest. In such cases, it has been shown that in comparison...
Air-coupled piezoelectric transducers made of 1–3 connectivity PMN-PT single crystal composites (centre frequency around 1.0 MHz) were designed, built and characterized. Several matching layers configurations have been tested in order to achieve optimum sensitivity or bandwidth or both. Results are compared with those obtained from similar transducers made using 1–3 PZT ceramic piezocomposites. Both...
We report a very compact, laser diode-pumped, frequency-tunable THz source (1.65 – 2.65 THz) based on Stimulated Polariton Scattering in Mg:LiNbO3. The system operates with very low threshold (∼ 2.5 W diode pump power) and outputs a maximum average power of 6.45 µW at 2 THz, at a pulse repetition frequency of 3 kHz.
The benefits shown in the reliability performance when using the low Ag solder in BGA package has been known due to its intrinsic characteristic. In this study, SAC alloy with the dopant D1 and D2 respectively are selected to compare with the widely-used solder alloy, SAC105, from the perspective of the thermal fatigue fracture. The 0.5mm-pitch TFBGA packages on Halogen-free FR4 PCB pre-treated at...
We present a novel MEMS-based power generator using activation of cardiomyocytes. Cardiomyocytes are cultured on the MEMS fabricated lead magnesium niobate-lead titanate (PMN-PT) single crystal diaphragm, directly and the mechanical stress induced by contraction forces from cardiomyocytes is conversed into electrical power. This PMN-PT single crystal diaphragm has one-side interdigitated electrode...
We are constructing a 1 mm3 resolution, high sensitivity PET detector system with depth of interaction capability. The detectors are built from modules comprising LSO crystal arrays coupled to Position Sensitive Avalanche Photodiodes (PSAPDs). The entire system will have 4,608 densely packed dual LSO-PSAPD modules. The performance of the large area (1?1 cm2) PSAPDs in our system depends on bias voltage...
We observe the propagation of 1D Airy beams through an unbiased photorefractive crystal. For ordinary polarization, the beam diffracts, while for extraordinary polarization it experiences nonlinearity through charge diffusion and has its diffraction suppressed.
Terahertz generations were demonstrated in periodically poled lithium niobate and lithium tantalate crystals around 1-2 THz. Different forward and backward terahertz radiations are possible in periodically poled structures via difference frequency generation within the ultra-broad pump laser. The generated THz pulses could be controlled by the quasi-phase matching structures.
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