scholarly journals A Study of High-Efficiency Laser Headlight Design Using Gradient-Index Lens and Liquid Lens

2020 ◽  
Vol 10 (20) ◽  
pp. 7331
Author(s):  
Yi-Chin Fang ◽  
Yih-Fong Tzeng ◽  
Chan-Chuan Wen ◽  
Chao-Hsien Chen ◽  
Hsiao-Yi Lee ◽  
...  
Keyword(s):  
Laser Beam ◽  
Light Source ◽  
High Efficiency ◽  
Optical Design ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Gradient Index ◽  
High Beam ◽  
Liquid Lens ◽  
Gradient Index Lens

In the field of vehicle lighting, due to the diode laser, its small size and high energy conversion efficiency, it can be effectively used as the headlight source of high beam. In recent years, it was adopted by European advanced car manufacturers as a new generation of automotive headlight lighting products. The current mature technology on the market is to extend the laser beam by means of reflection and to use a single high-power laser as the light source to meet the needs of surface lighting. In this research, we propose a new integrated optical design for an automotive headlight system with the rod lens, gradient-index lens (GRIN lens) and freeform lens to expand the laser beam. With regard to the diffusion of the beam by reflection and refraction, the liquid lens is used as a switch for the high beam and low beam lights to meet the needs of vehicle lighting functions and to use low-power diode lasers to synthesize the array light source. Compared with the 24-W LED headlight module available in the current market, the energy saved by this proposed optical design can increase efficiency by an average of 33%. The maximum illuminance is 56.6 lux in the high-beam mode, which is 18% higher than the standard value. Let the laser light meet the lighting requirements of regulatory standard values even beyond.

EUV light source and laser considerations for scalability and high-energy conversion efficiency

2002 ◽  
Author(s):  
Ian P. Mercer ◽  
Andrew Comley ◽  
Sebastian Davis-Ansted ◽  
Michael Egan ◽  
Samir S. Ellwi ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Light Source ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
High Energy Conversion Efficiency

scholarly journals Fabrication of Random Microlens Array for Laser Beam Homogenization with High Efficiency

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 338 ◽  
Author(s):  
Li Xue ◽  
Yingfei Pang ◽  
Wenjing Liu ◽  
Liwei Liu ◽  
Hui Pang ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Efficiency ◽  
Cost Effective ◽  
Microlens Array ◽  
High Energy ◽  
Light Spot ◽  
Energy Utilization ◽  
Utilization Rate ◽  
Laser Systems ◽  
High Coherence

The miniaturized and integrated microlens array (MLA) can effectively achieve the beam homogenization, compactness and miniaturization of laser systems. When the high-coherence laser beam is homogenized by means of using the MLA, interference fringes will occur in the homogenized light spot due to the periodicity of the MLA, which seriously affects the uniformity of the homogenized light spot. To solve this problem, a novel random microlens array (rMLA) structure was proposed for the purpose of achieving beam homogenization. The coherence in the homogenization process is suppressed by means of breaking the periodicity of the MLA. The homogenized light spot with a high energy utilization is then obtained accordingly. In the fabrication process, a clever method of combining chemical etching with lithography technology is performed to fabricate a honeycomb rMLA and a rectangular rMLA. The experimental results show that the energy utilization rate of the two types of the rMLAs is about 90%, and the uniformity of the homogenized light spots generated by the honeycomb rMLA and the rectangular rMLA are more than 80% and 85%, respectively. Meanwhile, fully cost-effective fabrication is possible to be realized.

scholarly journals Tunable Infrared Metamaterial Emitter for Gas Sensing Application

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1442 ◽  
Author(s):  
Ruijia Xu ◽  
Yu-Sheng Lin
Keyword(s):  
High Efficiency ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Ir Radiation ◽  
Optical Efficiency ◽  
Sensing Applications ◽  
On Chip ◽  
Ir Emission

We present an on-chip tunable infrared (IR) metamaterial emitter for gas sensing applications. The proposed emitter exhibits high electrical-thermal-optical efficiency, which can be realized by the integration of microelectromechanical system (MEMS) microheaters and IR metamaterials. According to the blackbody radiation law, high-efficiency IR radiation can be generated by driving a Direct Current (DC) bias voltage on a microheater. The MEMS microheater has a Peano-shaped microstructure, which exhibits great heating uniformity and high energy conversion efficiency. The implantation of a top metamaterial layer can narrow the bandwidth of the radiation spectrum from the microheater to perform wavelength-selective and narrow-band IR emission. A linear relationship between emission wavelengths and deformation ratios provides an effective approach to meet the requirement at different IR wavelengths by tailoring the suitable metamaterial pattern. The maximum radiated power of the proposed IR emitter is 85.0 µW. Furthermore, a tunable emission is achieved at a wavelength around 2.44 µm with a full-width at half-maximum of 0.38 µm, which is suitable for high-sensitivity gas sensing applications. This work provides a strategy for electro-thermal-optical devices to be used as sensors, emitters, and switches in the IR wavelength range.

scholarly journals A High-Efficiency Driver Circuit for a Gas-Sensor Microheater Based on a Switch-Mode DC-to-DC Converter

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5367
Author(s):  
Tzu-Sen Yang ◽  
Jin-Chern Chiou
Keyword(s):  
Power Consumption ◽  
Energy Conversion ◽  
Gas Sensor ◽  
Conversion Efficiency ◽  
High Efficiency ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Power Converter ◽  
Wide Range ◽  
Switch Mode

Low power consumption is one of the critical factors for successful Internet of Things (IoT) applications. In such applications, gas sensors have become a main source of power consumption because energy conversion efficiency of the microheater is relative over a wide range of operating temperatures. To improve the energy-conversion efficiency of gas-sensor microheaters, this paper proposes integrated switch-mode DC-to-DC power converter technology which we compare with traditional driving methods such as pulse-width modulation and the linear mode. The results indicate that energy conversion efficiency with this proposed method remains over 90% from 150 °C to 400 °C when using a 3.0, 4.2 and 5.0 V power supply. Energy-conversion efficiency increases by 1–74% compared with results obtained using the traditional driving methods, and the sensing film still detects alcohol and toluene at 200 °C and 280 °C, respectively, with high energy conversion efficiency. These results show that the proposed method is useful and should be further developed to drive gas-sensor microheaters, and then integrated into the circuits of the complementary metal-oxide-semiconductor micro electro mechanical systems (CMOS-MEMS).

scholarly journals Generation of high-energy ion bunches via laser-induced cavity pressure acceleration at ultra-high laser intensities

2014 ◽  
Vol 32 (1) ◽  
pp. 129-135 ◽  
Author(s):  
S. Jabłoński ◽  
J. Badziak ◽  
P. Rączka
Keyword(s):  
Laser Beam ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Light Polarization ◽  
Cavity Pressure ◽  
Pure Radiation ◽  
Ion Energy ◽  
Particle In Cell ◽  
High Laser ◽  
Ion Energies

AbstractIn this paper, a new method for efficient generation of high-energy ion bunches via laser-induced cavity pressure acceleration (LICPA) is examined using one-dimensional particle-in-cell code PIC1D. It is found that for high laser beam intensities of the order of 1022 W/cm2 and for circular light polarization, a substantial increase in parameters of the accelerated ions is obtained when the target is placed inside a special cavity, into which the laser beam is introduced by a small hole. As compared to the pure radiation pressure acceleration scheme, the LICPA scheme leads to an increase in ion energies and the laser-to-ions energy conversion efficiency while the width of the ion energy spectrum are similar for both the schemes. Such a tendency was observed for all carbon targets (from 2 µm to 0.2 µm thick) investigated in the paper. The results of PIC1D simulations agree very well with predictions of the suitably generalized light sail model.

Design of gradient-index lens systems for laser beam reshaping

1993 ◽  
Vol 32 (25) ◽  
pp. 4763 ◽  
Author(s):  
Cheng Wang ◽  
David L. Shealy
Keyword(s):  
Laser Beam ◽  
Gradient Index ◽  
Gradient Index Lens

scholarly journals Pt-on-Pd bimetallic nanodendrites stereoassembled on MXene nanosheets as high-efficiency electrocatalysts toward methanol oxidation reaction

2021 ◽  
Author(s):  
Cuizhen Yang ◽  
Quanguo Jiang ◽  
Huan Liu ◽  
Lu Yang ◽  
Haiyan He ◽  
...  
Keyword(s):  
Direct Methanol Fuel Cell ◽  
High Efficiency ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Green Energy ◽  
Methanol Oxidation Reaction ◽  
Direct Methanol ◽  
High Energy Conversion Efficiency ◽  
Pollution Emissions ◽  
Methanol Fuel Cell

Direct methanol fuel cell (DMFC) has been considered as an ideal “green” energy converter because of its high energy-conversion efficiency and low pollution emissions, while the high costs and poor...

Sonic Gradient Index Lens in Water

2010 ◽  
Author(s):  
Theodore P. Martin ◽  
Michael Nicholas ◽  
Gregory J. Orris ◽  
Liang-Wu Cai ◽  
Daniel Torrent ◽  
...  
Keyword(s):  
Gradient Index ◽  
Gradient Index Lens
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