Session Index

Optical vortex laser was built using modified azimuthal symmetry breaking resonator with a planar output coupler supporting off-axis single pass transverse traveling wave trajectory. This new configuration paves the way for intra-cavity vortex second harmonic generation and other nonlinear processes.

 

This paper reports the frequency-lock using a low-cost Arduino microcontroller of a DFB laser diode (DFB-LD) to a Fabry-Perot cavity. Comparing with the conventional analogue frequency stabilization system, this scheme has the benefits of lower price, compactness, and in-time adjusting of the PID parameters.

 

Laser treatment of MEH-PPV films increased photoluminescence (PL) by up to 400% in nitrogen. Emission was stable suggesting the new morphology is stable at room temperature. We believe this increased PL efficiency in primarily the result of reduced efficiency of trap-assisted recombination due to decreased energy transfer.

 

In this work, the design of multi-channels tri-gate AlGaN/GaN high-electron-mobility transistors is optimized for high-power and high-frequency applications. With a full 3D FEM modeling, we have find the optimized design rule for multi-channel FinFETs and enhance performance of multi-channel FinFETs.

 

We present a numerical investigation of two mutually delay-coupled semiconductor lasers when the linewidth enhancement factors of two lasers are the same or different. It is obvious that the asymmetry has a significant influence on the laser dynamical behavior, and the laser with a small value dominates the system.

 

In this work, direct modeling the carrier transport behavior in type-II superlattices (T2SL) InAs/InAsSb infrared photoconductor system was demonstrated by coupling localization landscape (LL) theory into drift-diffusion (DD) and Poisson model. The electronic properties of InAs/InAsSb T2SL were calculated by eight-band k.p model.

 

We present a 1 um diode-pumped solid-state laser with dynamic thermal lensing compensation. The beam quality, M2, of 1064 nm was able to manipulate from 2.4 to ~1 and a dual wavelength laser, 1064 and 1047 nm, was also observed.

 

We report a LED-pumped Nd: YAG laser operating at an actively Q-switched mode. When we pump the laser with 350mJ at 750 nm, we measured a 760 μJ laser pulse energy at 1064 nm and a pulse width of 178 ns; the corresponding laser peak power is 4.2 KW.

 

Far-infrared thermal emitters with integrated optical filter are designed and fabricated on standard 0.35-μm CMOS platform. Improved thermal uniformity and power efficiency can be obtained with spiral metal wire heaters. The periodic cross-shaped holes realized on another metal layer can provide wavelength filtering at 14 μm, verified by FTIR measurement.

 

This paper aims at using a single-beam LIDAR device to build a 3-dimensional map for the vision of the self-driving car for rescuing applications. This study was to improve the operation speed of the LIDAR system. The high-speed mapping provides a new view of an automatic car in rescue missions.

 

We study the effect of spatial hole burning at different MgO:PPLN lengths in a positive χ(2) cascaded mode-locked Nd:YVO4 laser. A gain grating effect was observed which substitutes for the spatial hole burning (SHB) effect when a 25 mm MgO:PPLN length is adopted corresponding with a 0.08 nm acceptance bandwidth.

 

The effects of designing a tunnel junction (TJ) structure in an InGaN vertical-cavity surface-emitting laser, for the purpose of reducing optical loss and leakage current, have been investigated by numerical simulations. The results are also compared with experimental values and it passed over 500h from the HTOL test.

 

This work reports a method to depress the Mikania micrantha growth by exposing stems on CW and Pulse lasers. We observed and compared the damage status of the stems after irradiating by CW and pulse lasers.

 

This work is a way to identify the quality of a culture pond by using an optical absorption measurement and corresponding the aqueous inspection. Furthermore, we also use the hemocytometer counting method to observe the algae of the ponds.

 

This work analyzes the band structure and plasmon in multilayer black phosphorous (BP). Compact band model is used to study the Γ band structure of multilayer BP from first principle method. Plasmon energies as function of carrier density are calculated for multilayer BP.

 

Laser micromachining is applied to the ablation phenomenon of the CMOS-MEMS device. It can be known that the pulse is 90 seconds and the laser energy is 0.228 mJ. The ablation quality is good effect.

 

We demonstrated a high-power, broadband, high-polarization (TE/TM) extinction ratio super- luminance diode (SLD) for the interference gyro application. A highly compressive-strain multiple quantum well was fabricated with 7-degree waveguide, leading to larger than 10mW, >15dB polarization extinction ratio and <1dB ripple.

 

We report on the investigation of high power Yb:YAG crystal fiber amplifiers around 1 um. A theoretical study is performed to optimize the amplifier performance. According to the simulation, 148-W amplified power can be generated from a 23.4-cm Yb:YAG crystal fiber with a conversion efficiency of 89%.

 

This work observed the performance of a passive Q-switched diode-end-pumped Nd:YVO4 laser by varying the reflectance of output couplers. When the reflectivity of output coupler is 70%, the maximum peak power of 360.3W and pulse width of 11ns were achieved.

 

The 3D digital platform is used to analyze ablation in laser processing and to model and analyze ablated surface areas.

 

Abstract— We report the use of a kW-class continuous wave Yb-fiber Laser for metal cladding by directional energy deposition. 3D printing or Cladding of S316L (stainless steel) powder is demonstrated at a laser power ≤ 500W and a deposition spot size of around 1.5 mm.


 

In this study, a commercial LiDAR is used to evaluate the objects with different size and distance to verify the accuracy and precision of the measurements. the object with larger size introduces a smaller measurement deviation if the LiDAR is used to calculate the dimension of object.