Low-cost laser-beam analyzer

2002 ◽  
Author(s):  
Tatyana Y. Cherezova ◽  
Yu. V. Sheldakova ◽  
Alexis V. Kudryashov
Keyword(s):  
Laser Beam ◽  
Low Cost

scholarly journals Investigation of serial coherent laser beam combination based on Brillouin amplification

2007 ◽  
Vol 25 (1) ◽  
pp. 79-83 ◽  
Author(s):  
SHUANGYI WANG ◽  
ZHIWEI LÜ ◽  
DIANYANG LIN ◽  
LEI DING ◽  
DONGBIN JIANG
Keyword(s):  
Laser Beam ◽  
High Power ◽  
Simple Structure ◽  
Low Cost ◽  
Coupling Efficiency ◽  
Laser Beams ◽  
Beam Combination ◽  
Multiple Beams ◽  
Combination Scheme ◽  
Stokes Beam

Based on transferring energy from multiple pump beams into one Stokes beam using Brillouin amplification, a serial coherent laser beam combination scheme is presented, which has many advantages, such as, simple structure, low cost, ease of adjustment, higher load capability, scalable easily, etc. Furthermore, it has been demonstrated that the combination of several beams using this method is theoretically possible. But in practice, the amplification of high power Stokes beam is a key problem to solve. In this paper, the amplification of Stokes beam whose power is higher than the pump beam is first studied and proved experimentally. Coupling the two laser beams by this method is proved experimentally, and the coupling efficiency reaches more than 80%. Then the feasibility of multiple beams combination based on Brillouin amplification is analyzed and tested theoretically.

LOW-COST AND ROBUST POSITIONING SYSTEM FOR INDOOR GROUP OF FORKLIFTS UTILIZING PROBABILITY ESTIMATION AND SENSOR NETWORK

2008 ◽  
Vol 05 (02) ◽  
pp. 163-179
Author(s):  
TSAI-LIN CHOU ◽  
NORISUKE FUJII ◽  
JUN OTA ◽  
MASAYUKI TANAKA ◽  
AKIKO SHINOZAKI
Keyword(s):  
Laser Beam ◽  
Sensor Network ◽  
System Performance ◽  
Low Cost ◽  
Probability Estimation ◽  
Positioning System ◽  
Estimation Algorithms ◽  
Warehouse Storage ◽  
Position Management ◽  
The Cost

A position management system for forklifts involved in a warehouse storage task is proposed. With a simple, low-cost laser beam sensor and reflective stickers, the position of the forklift can be established. Furthermore, by combining probability estimation algorithms, the possible location of forklifts can be managed, and the accuracy of positioning can be improved through the exchange of information on a sensor network. Finally, the layout, which has a better system performance, is also discussed and proposed. With this system, forklift operations are easier, and the cost of a warehouse navigation system decreases.

scholarly journals A High Precision Laser-Based Autofocus Method Using Biased Image Plane for Microscopy

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Chao-Chen Gu ◽  
Hao Cheng ◽  
Kai-Jie Wu ◽  
Liang-Jun Zhang ◽  
Xin-Ping Guan
Keyword(s):  
Laser Beam ◽  
High Precision ◽  
Low Cost ◽  
Image Plane ◽  
Circle Fitting ◽  
Essential Factor ◽  
Assembly Accuracy ◽  
Fitting Algorithm ◽  
Experiment Device ◽  
Study Designs

This study designs and accomplishes a high precision and robust laser-based autofocusing system, in which a biased image plane is applied. In accordance to the designed optics, a cluster-based circle fitting algorithm is proposed to calculate the radius of the detecting spot from the reflected laser beam as an essential factor to obtain the defocus value. The experiment conduct on the experiment device achieved novel performance of high precision and robustness. Furthermore, the low demand of assembly accuracy makes the proposed method a low-cost and realizable solution for autofocusing technique.

scholarly journals A simple laser beam characterization apparatus based on imaging

2021 ◽  
Vol 19 (2) ◽  
pp. 98-116
Author(s):  
F. Bisti ◽  
I. Alexeev ◽  
M. Lanzetta ◽  
M. Schmidt
Keyword(s):  
Laser Beam ◽  
Experimental Validation ◽  
Optical Measurement ◽  
Low Cost ◽  
Quality Parameters ◽  
Camera Model ◽  
Manufacturing Operations ◽  
Rayleigh Range ◽  
Beam Characterization ◽  
Matrix Sensor

The development of an original low-cost hardware/software apparatus to optically control the laser beam and measure quality parameters by image analysis using a monochrome matrix sensor is described, along with experimental validation. Laser parameters, namely beam waist, divergence, Rayleigh range and M2, which are the most relevant in manufacturing operations (like optical measurement and laser processing), have been physically and mathematically characterized. Strategies for the apparatus size reduction are also presented, including the use of a prism to reduce by half the optical path, and a camera model to simulate the sensor resolution.

Relationship Between the Cost of 12 Light-curing Units and Their Radiant Power, Emission Spectrum, Radiant Exitance, and Beam Profile

2021 ◽  
Author(s):  
CJ Soares ◽  
SSL Braga ◽  
RB Price
Keyword(s):  
Laser Beam ◽  
Emission Spectrum ◽  
Fiber Optic ◽  
Low Cost ◽  
Integrating Sphere ◽  
High Positive Correlation ◽  
Light Curing ◽  
Radiant Power ◽  
The Cost ◽  
Digital Caliper

SUMMARY Objectives: To correlate the radiant power (mW), radiant exitance (or tip irradiance in mW/cm2), emission spectrum (mW/cm2/nm), and beam irradiance profile of 12 light-curing units (LCUs) available in the Brazilian market with their market cost. Methods and Materials: Six LCUs that cost more than US$900 (Bluephase G4,VALO Grand, VALO Cordless, Radii Xpert, Elipar DeepCure-S, and Radii plus) and six low-cost LCUs costing less than US$500 (Radii Cal, Optilight Max, High Power LED 3M, Emitter D, Emitter C, and LED B) were examined. Radiant power (mW) and emission spectrum (mW/nm) were measured using an integrating sphere connected to a fiber-optic spectroradiometer. The internal tip diameter (mm) of each LCU was measured using a digital caliper and was used to calculate the average radiant exitance (mW/cm2). Irradiance profiles at the light tip were measured using a commercial laser beam profiler. The cost of each LCU in Brazil was correlated with internal tip diameter, radiant power, and tip irradiance. Results: None of the low-cost LCUs were broad spectrum multiple peak LCUs. There was no correlation between the cost of the LCUs and their averaged tip irradiance; however, there was a high positive correlation between the cost of the LCUs and the radiant power and tip diameter. The VALO Grand, Elipar DeepCure-S, VALO Cordless, and Bluephase G4 all emitted a higher radiant power. They also had a significantly greater tip diameter than other LCUs. For the LCUs with a nonuniform output, some areas of the light tip delivered less than 400 mW/cm2, while other areas delivered more than 2500 mW/cm2. Conclusions: In general, LCUs that had a higher cost (US$971-US$1800) delivered more power (mW) and had a greater tip diameter (mm), which covered more of a tooth. In general, the low-cost LCUs (US$224-US$470) emitted a lower radiant power and had a smaller tip diameter.

Effect of laser beam truncation (pinhole), (ordered) dithering, and jitter on residual smoothness after poly(methyl methacrylate) ablations, using a close-to-Gaussian beam profile

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shwetabh Verma ◽  
Juergen Hesser ◽  
Samuel Arba-Mosquera
Keyword(s):  
Laser Beam ◽  
Methyl Methacrylate ◽  
Gaussian Beam ◽  
Low Cost ◽  
Random Noise ◽  
Beam Profile ◽  
Negatively Associated ◽  
Poly Methyl Methacrylate ◽  
The Impact ◽  
Ordered Dithering

Abstract Smoother surfaces after laser vision correction have been widely accepted as a factor for improving visual recovery regardless of the used technique (PRK, LASIK, or even SMILE). We tested the impact of laser beam truncation, dithering (expressing a continuous profile on a basis of lower resolution causing pixels to round up/down the number of pulses to be placed), and jitter (a controlled random noise (up to ±20 µm in either direction) added to the theoretical scanner positions) on residual smoothness after Poly(methyl methacrylate) (PMMA) ablations, using a close-to-Gaussian beam profile. A modified SCHWIND AMARIS system has been used providing a beam profile with the following characteristics: close-to-Gaussian beam profile with full width at half maximum (FWHM) of 540 µm, 1050 Hz. Laser parameters have been optimized following Invest. Ophthalmol. Vis. Sci., vol. 58, no. 4, pp. 2021–2037, 2017, the pulse energy has been optimized following Biomed. Opt. Express vol. 4, pp. 1422–1433, 2013. For the PMMA ablations, two configurations (with a 0.7 mm pinhole and 0.75 mJ and without pinhole and 0.9 mJ (for fluences of 329 mJ/cm2 and 317 mJ/cm2 and corneal spot volumes of 174 and 188 pl)) were considered, along with two types of lattices (with and without ordered dithering to select the optimum pulse positions), and two types of spot placement (with and without jitter). Real ablations on PMMA (ranging from −12D to +6D with and without astigmatism of up to 3D) completed the study setup. The effect of the 2 × 2 × 2 different configurations was analyzed based on the roughness in ablation estimated from the root mean square error in ablation. Truncation of the beam is negatively associated to a higher level of residual roughness; ordered dithering to select the optimum pulse positions is positively associated to a lower level of residual roughness; jitter is negatively associated to a higher level of residual roughness. The effect of dithering was the largest, followed by truncation, and jitter had the lowest impact on results. So that: Dithering approaches help to further minimize residual roughness after ablation; minimum (or no) truncation of the beam is essential to minimize residual roughness after ablation; and jitter shall be avoided to minimize residual roughness after ablation. The proposed model can be used for optimization of laser systems used for ablation processes at relatively low cost and would directly improve the quality of results. Minimum (or no) truncation of the beam is essential to minimize residual roughness after ablation. Ordered dithering without jitter helps to further minimize residual roughness after ablation. Other more complex dithering approaches may further contribute to minimize residual roughness after ablation.

Design and Prototype Development of Quadrant Estimation Unit for Laser Beam Rider Guidance System

2020 ◽  
Vol 9 (03) ◽  
pp. 24970-24977
Author(s):  
Dr. Gunti Avinash ◽  
Saiseshu Reddy ◽  
P. Vijaya Poojitha
Keyword(s):  
Laser Beam ◽  
Beam Quality ◽  
Low Cost ◽  
Essential Element ◽  
Guidance System ◽  
Target Space ◽  
Laser Guidance ◽  
Atmospheric Transmission ◽  
Silicon Photodiode ◽  
Prototype Development

With the development of science and technology, precision-strike weapons are been considered to be important for winning victory and defending the country during war (or) attack. Laser guidance is one of the major methods to execute precision-strike in modern warfare. At present, the problems faced at the primary stage of Laser guidance has been solved with endeavors of countries. Several technical aspects of laser-beam riding guided system have been mature, such as atmosphere penetration of laser beam, clutter inhibition on ground, laser irradiator, encoding and decoding of laser beam. Further, laser beam quality, equal output power and atmospheric transmission properties are qualified for warfare situation. Riding guidance instrument is a crucial element of Laser-beam riding guided system and also in Radar-beam riding guiding system, and is also a essential element of airborne, vehicle-mounted and individual weapon. The optical system mainly consists of sighting module and laser-beam guided module. Photo detector (Quadrant detector) is the most important sensing device, and also the key to acquire the coordinate information of target space. Currently, in consideration of the 1064 nm of wavelength applied in all the semi-active laser guided weapons systems, lithium drifting silicon photodiode which is sensitive to 1064 nm of wavelength is used in photoelectric detector. Compared to Solid and gas laser, diode laser has many merits such as small volume, simple construction, light weight, long life, low cost and easy modulation.  The present work includes the study of Various ATGM, their guidance mechanism, particularly laser beam rider guidance. Study has been carried to understand the composition and operating principle of Laser-beam riding guided system. The present work also deals with prototype development of quadrant estimation unit required for Laser beam rider guidance.

Use of a Holographic Rejection Filter to Improve the Sensitivity of a Commercial Raman Microprobe

1992 ◽  
Vol 46 (5) ◽  
pp. 746-748 ◽  
Author(s):  
Neil Everall
Keyword(s):  
Laser Beam ◽  
Laser Intensity ◽  
Specular Reflection ◽  
Low Cost ◽  
Laser Line ◽  
Solid Samples ◽  
Data Accumulation ◽  
Rejection Filter ◽  
Raman Microprobe ◽  
Raman Scatter

The use of a holographic rejection filter has been demonstrated to improve the sensitivity of a commercial Raman microprobe by a factor of ∼3.5, allowing shorter data accumulation times or a reduction of the laser intensity at the sample. The filter has been tested with two very different solid samples; the first (TiO2 powder) gives a strong diffusely scattered laser beam along with the Raman scatter. The second (silicon) gives a strong specular reflection of the laser beam, again severely testing the laser rejection capabilities of the filter. Bands down to 200 cm−1 shift were transmitted by the filter without attenuation but with satisfactory rejection of the laser line. This approach provides a simple way of enhancing the performance of a commercial microprobe at low cost.

NanoParticle Tracking Analysis; The Halo System

2006 ◽  
Vol 952 ◽  
Author(s):  
Andrew Malloy ◽  
Patrick Hole ◽  
Bob Carr
Keyword(s):  
Laser Beam ◽  
Real Time ◽  
Software Package ◽  
Low Cost ◽  
Optical Element ◽  
Optical Microscope ◽  
New Technique ◽  
Nanoparticle Tracking Analysis ◽  
Nanoscale Particles ◽  
A New Technique

ABSTRACTA new technique for nanoparticle sizing that allows visualisation of nanoscale particles in liquids on an individual basis is described. The technology comprises a metallised optical element illuminated by laser beam at the surface of which nanoscale particles in suspension can be directly visualised, sized and counted in real time using only a conventional optical microscope fitted with a low cost camera and a dedicated analytical software package.

Proposal of High-Quality Laser Hardening System for Shaft Parts Using Cylindrical Mirror and Ring-Beam Shaped by High-Speed Laser Scan System

2020 ◽  
Author(s):  
Hirotaka Tanabe ◽  
Keiji Ogawa ◽  
Heisaburo Nakagawa ◽  
Hirohito Tsukada ◽  
Yuki Goto
Keyword(s):  
Heat Treatment ◽  
Laser Beam ◽  
High Speed ◽  
High Efficiency ◽  
High Reliability ◽  
Low Cost ◽  
Treatment Method ◽  
Post Processing ◽  
High Quality ◽  
Almost All

Abstract Shaft parts are important parts used in almost all machines including automobiles. In addition, extremely high reliability is required since a shaft failure is directly linked to a fatal machine trouble. Therefore, a hardening process is usually conducted to improve strength and wear resistance. In this study, we propose a new laser heat treatment method to produce high-quality and high-accuracy shafts with high efficiency, low cost and low environmental impact. We will also develop a technique to derive the appropriate laser irradiation conditions quickly and systematically for shafts with various shapes and dimensions. There are the other hardening techniques including the electric furnace method and the induction method. These methods require post-processing for deformation correction, whereas the proposed method uses a laser to achieve thermal deformation-free hardening, eliminating the need for the post-processing. As a result, an improvement in yield can be expected due to a reduction of the products that cannot be corrected after heat treatment, which had to be waste disposed with conventional methods. By using our method, the entire circumference of the shaft was hardened by using a ring-shaped laser beam and a cylindrical inner mirror. Here, the ring-shaped laser beam was formed by high-speed scanning of a spot shapelaser. In the present paper, the details of this system were introduced and some experimental results were described.

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