scholarly journals Interference Spectral Imaging Based on Liquid Crystal Relaxation and Its Application in Optical Component Defect Detection

2022 ◽  
Vol 12 (2) ◽  
pp. 718
Author(s):  
Jiajia Yuan ◽  
Wei Fan ◽  
He Cheng ◽  
Dajie Huang ◽  
Tongyao Du
Keyword(s):  
Liquid Crystal ◽  
Imaging System ◽  
Spectral Imaging ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Hyperspectral Data ◽  
Optical Component ◽  
Path Delay ◽  
Polarized Beams

In this paper, we propose a fast interference spectral imaging system based on liquid crystal (LC) relaxation. The path delay of nematic LC during falling relaxation is used for the scanning of the optical path. Hyperspectral data can be obtained by Fourier transforming the data according to the path delay. The system can obtain two-dimensional spatial images of arbitrary wavelengths in the range of 300–1100 nm with a spectral resolution of 262 cm−1. Compared with conventional Fourier transform spectroscopy, the system can easily collect and integrate all valid information within 20 s. Based on the LC, controlling the optical path difference between two orthogonally polarized beams can avoid mechanical movement. Finally, the potential for application in contactless and rapid non-destructive optical component defect inspection is demonstrated.

Peak-to-peak tracking method for measurement of optical path difference: Revisited

Optik ◽  
2015 ◽  
Vol 126 (24) ◽  
pp. 5420-5422
Author(s):  
H.H. Ley ◽  
A. Yahaya ◽  
Y. Munajat
Keyword(s):  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Tracking Method ◽  
Peak Tracking

Optical T-Bench Method for Measurement of Optical Path Difference

1963 ◽  
Vol 1 (6) ◽  
Author(s):  
Francis E. Washer ◽  
Walter R. Darling
Keyword(s):  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path

Thermo-Fluid Design Simulation of Nd3+ POCl3 Transverse Flow Liquid Laser Cavity

2021 ◽  
pp. 1-31
Author(s):  
Vinod Singh ◽  
Gaurav Singhal ◽  
Prabal Talukdar
Keyword(s):  
Refractive Index ◽  
Temperature Gradient ◽  
Flow Rate ◽  
Optical Pumping ◽  
Gain Medium ◽  
Optical Path Difference ◽  
Path Difference ◽  
Transverse Flow ◽  
Optical Path ◽  
Liquid Laser

Abstract CFD based thermal design of a transverse flow optical cavity is carried out for 1 kW Nd3+ POCl3 liquid laser source to investigate temperature and velocity distribution in the optical pumping region of the cavity. Temperature gradient and turbulence both affect the refractive index of the liquid gain medium, which results in optical path difference, divergence and hence, poorer quality of the laser beam. The main purpose of this design is to achieve uniform flow and least temperature gradient in the optical pumping region so that the optical path difference can be minimized and a good beam quality can be achieved. CFD model has been developed for carrying out thermo-fluid simulations for this thermal system and based on these simulations, an optimum geometry of inlet ports along with their position from optical pumping region have been proposed. A user defined function (UDF) is incorporated for the input of spatially varying heat source term in each cell of the optical pumping region of the cavity. Variations in refractive index and optical path difference are estimated from the temperature data using another UDF. Simulation reveals that mass flow rate between 1.5 kg/s to 2.0 kg/s maintains the optical homogeneity of gain medium. Preliminary experiments have been carried out to demonstrate the effect of flow rate on the beam divergence and thereby exhibiting the importance of present simulation work.

Thermal optical path difference analysis of off-axis lens ray trace foot-print at Cassegrain telescope correct lens assembly

2012 ◽  
Author(s):  
Ming-Ying Hsu ◽  
Yu-Chuan Lin ◽  
Chia-Yen Chan ◽  
Wei-Cheng Lin ◽  
Shenq-Tsong Chan ◽  
...  
Keyword(s):  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path ◽  
Difference Analysis ◽  
Lens Assembly ◽  
Ray Trace ◽  
Cassegrain Telescope

scholarly journals Real-time optical path difference compensation at the Plateau de Calern I2T interferometer

2001 ◽  
Vol 365 (2) ◽  
pp. 301-313 ◽  
Author(s):  
B. Sorrente ◽  
F. Cassaing ◽  
G. Rousset ◽  
S. RobbeDubois ◽  
Y. Rabbia
Keyword(s):  
Real Time ◽  
Optical Path Difference ◽  
Path Difference ◽  
Optical Path
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