Application of a C. W. Laser as a light source in an optical alignment method

1965 ◽  
Vol 16 (1) ◽  
pp. 126-128 ◽  
Author(s):  
H. J. Raterink
Keyword(s):  
Light Source ◽  
Alignment Method ◽  
Optical Alignment

scholarly journals Radio and optical alignment method based on GPS

MethodsX ◽  
2019 ◽  
Vol 6 ◽  
pp. 2057-2064
Author(s):  
M. Mariola ◽  
Y. Ismail ◽  
F. Petruccione
Keyword(s):  
Alignment Method ◽  
Optical Alignment

scholarly journals Study on Aided Optical Alignment by Programmable Spots Array Generated by Off-Axis Parabolic Phase Based on LCoS-SLM

2020 ◽  
Vol 10 (23) ◽  
pp. 8382
Author(s):  
Zhen Zeng ◽  
Zexiao Li ◽  
Fengzhou Fang ◽  
Xiaodong Zhang
Keyword(s):  
Liquid Crystal ◽  
Optical System ◽  
Phase Modulation ◽  
Spatial Light Modulator ◽  
Incident Light ◽  
Alignment Method ◽  
Light Modulator ◽  
Optical Alignment ◽  
Liquid Crystal On Silicon

We present an aided optical alignment method using the liquid crystal on silicon spatial light modulator (LCoS-SLM). An optical system composed of an interferometer and an LCoS-SLM was established to verify the effectiveness of the method. The system was also calibrated to solve the phase modulation nonlinear and nonuniformity problem for better performance of LCoS-SLM as an easily programmable phase compensator. The LCoS-SLM could modulate the phase of incident light precisely to generate an accurate phase desired to achieve a virtual off-axis parabolic phase to generate light spots array. Finally, the 2 × 2 light spots array generated by the optical system was used to verify its potential in optical alignment.

scholarly journals Dual-Frequency Doppler LiDAR Based on External Optical Feedback Effect in a Laser

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6303
Author(s):  
Zhuqiu Chen ◽  
Yanguang Yu ◽  
Yuxi Ruan ◽  
Bairun Nie ◽  
Jiangtao Xi ◽  
...  
Keyword(s):  
Light Source ◽  
Optical Feedback ◽  
Low Cost ◽  
Potential Contribution ◽  
Doppler Lidar ◽  
Dual Frequency ◽  
Measurement Resolution ◽  
High Measurement ◽  
Practical Engineering ◽  
Optical Alignment

A novel Dual-frequency Doppler LiDAR (DFDL) is presented where the dual-frequency light source is generated by using external optical feedback (EOF) effect in a laser diode (LD). By operating a LD at period-one (P1) state and choosing suitable LD related parameters, a dual-frequency light source can be achieved. Such a dual-frequency source has advantages of the minimum part-count scheme, low cost in implementation, and ease in optical alignment. Theory and system design are presented for the proposed DFDL for velocity measurement with high measurement resolution. The proposed design has a potential contribution to the Light Detection And Ranging (LiDAR) in practical engineering applications.

Precise and simple optical alignment method for double-sided lithography

2001 ◽  
Vol 40 (28) ◽  
pp. 5052 ◽  
Author(s):  
Matthias Gruber ◽  
Detlev Hagedorn ◽  
Werner Eckert
Keyword(s):  
Alignment Method ◽  
Optical Alignment

A Passive Optical Alignment Technique for Single-mode Fibers and Light-source Arrays

2017 ◽  
Author(s):  
K. Adachi ◽  
A. Nakanishi ◽  
T. Suzuki ◽  
H. Irie ◽  
Y. Sasaki ◽  
...  
Keyword(s):  
Light Source ◽  
Single Mode ◽  
Alignment Technique ◽  
Optical Alignment

A Method for Setting the Clearance Angle

1972 ◽  
Vol 30 ◽  
pp. 388-389
Author(s):  
Michael T. Bucek ◽  
Howard J. Arnott
Keyword(s):  
Experimental Evidence ◽  
Light Source ◽  
Black Spot ◽  
Critical Factor ◽  
Clearance Angle ◽  
Crude Approximation ◽  
Ultrathin Sections

It is believed by the authors, with supporting experimental evidence, that as little as 0.5°, or less, knife clearance angle may be a critical factor in obtaining optimum quality ultrathin sections. The degree increments located on the knife holder provides the investigator with only a crude approximation of the angle at which the holder is set. With the increments displayed on the holder one cannot set the clearance angle precisely and reproducibly. The ability to routinely set this angle precisely and without difficulty would obviously be of great assistance to the operator. A device has been contrived to aid the investigator in precisely setting the clearance angle. This device is relatively simple and is easily constructed. It consists of a light source and an optically flat, front surfaced mirror with a minute black spot in the center. The mirror is affixed to the knife by placing it permanently on top of the knife holder.

A confocal laser scanning microscope for fluorescence and reflection at video rates

1989 ◽  
Vol 47 ◽  
pp. 134-135
Author(s):  
P.M. Houpt ◽  
A. Draaijer
Keyword(s):  
Light Source ◽  
Laser Scanning ◽  
Focal Point ◽  
Confocal Laser Scanning Microscope ◽  
Confocal Laser ◽  
Point Light Source ◽  
Volume Of Interest ◽  
Ion Laser ◽  
Point Light ◽  
Point Detector

In confocal microscopy, the object is scanned by the coinciding focal points (confocal) of a point light source and a point detector both focused on a certain plane in the object. Only light coming from the focal point is detected and, even more important, out-of-focus light is rejected.This makes it possible to slice up optically the ‘volume of interest’ in the object by moving it axially while scanning the focused point light source (X-Y) laterally. The successive confocal sections can be stored in a computer and used to reconstruct the object in a 3D image display.The instrument described is able to scan the object laterally with an Ar ion laser (488 nm) at video rates. The image of one confocal section of an object can be displayed within 40 milliseconds (1000 х 1000 pixels). The time to record the total information within the ‘volume of interest’ normally depends on the number of slices needed to cover it, but rarely exceeds a few seconds.

Inter-Method Reliability of Pulse Volume Related Measures Derived Using Finger-Photoplethysmography

2018 ◽  
Vol 32 (4) ◽  
pp. 182-190 ◽  
Author(s):  
Kenta Matsumura ◽  
Koichi Shimizu ◽  
Peter Rolfe ◽  
Masanori Kakimoto ◽  
Takehiro Yamakoshi
Keyword(s):  
Light Intensity ◽  
Adverse Effects ◽  
Light Source ◽  
Direct Current ◽  
Resting State ◽  
Current Component ◽  
Psychophysiological Measures ◽  
Pulse Volume ◽  
Optical Paths ◽  
Sensor Positions

Abstract. Pulse volume (PV) and its related measures, such as modified normalized pulse volume (mNPV), direct-current component (DC), and pulse rate (PR), derived from the finger-photoplethysmogram (FPPG), are useful psychophysiological measures. Although considerable uncertainties exist in finger-photoplethysmography, little is known about the extent of the adverse effects on the measures. In this study, we therefore examined the inter-method reliability of each index across sensor positions and light intensities, which are major disturbance factors of FPPG. From the tips of the index fingers of 12 participants in a resting state, three simultaneous FPPGs having overlapping optical paths were recorded, with their light intensity being changed in three steps. The analysis revealed that the minimum values of three coefficients of Cronbach’s α for ln PV, ln mNPV, ln DC, and PR across positions were .948, .850, .922, and 1.000, respectively, and that those across intensities were .774, .985, .485, and .998, respectively. These findings suggest that ln mNPV and PR can be used for psychophysiological studies irrespective of minor differences in sensor attachment positions and light source intensity, whereas and ln DC can also be used for such studies but under the condition of light intensity being fixed.

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