Minimally invasive fiber endoscope with 3D printed diffractive optical element (DOE) for biomedicine

2021 ◽  
Author(s):  
Elias Scharf ◽  
Mariana Medina-Sanchez ◽  
Robert Kuschmierz ◽  
Oliver G. Schmidt ◽  
Jürgen W. Czarske
Keyword(s):  
Minimally Invasive ◽  
Optical Element ◽  
Diffractive Optical Element ◽  
3D Printed

scholarly journals Holographic Display System to Suppress Speckle Noise Based on Beam Shaping

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 204
Author(s):  
Di Wang ◽  
Yi-Wei Zheng ◽  
Nan-Nan Li ◽  
Qiong-Hua Wang
Keyword(s):  
Optical Element ◽  
Speckle Noise ◽  
Beam Shaping ◽  
Diffractive Optical Element ◽  
The Other ◽  
Spatial Light Modulators ◽  
Viewing Angle ◽  
Display System ◽  
Holographic Display ◽  
Light Modulators

In this paper, a holographic system to suppress the speckle noise is proposed. Two spatial light modulators (SLMs) are used in the system, one of which is used for beam shaping, and the other is used for reproducing the image. By calculating the effective viewing angle of the reconstructed image, the effective hologram and the effective region of the SLM are calculated accordingly. Then, the size of the diffractive optical element (DOE) is calculated accordingly. The dynamic DOEs and effective hologram are loaded on the effective regions of the two SLMs, respectively, while the wasted areas of the two SLMs are performed with zero-padded operations. When the laser passes through the first SLM, the light can be modulated by the effective DOEs. When the modulated beam illuminates the second SLM which is loaded with the effective hologram, the image is reconstructed with better quality and lower speckle noise. Moreover, the calculation time of the hologram is reduced. Experiments indicate the validity of the proposed system.

High-efficiency subwavelength diffractive optical element in GaAs for 975 nm

1995 ◽  
Vol 20 (12) ◽  
pp. 1441 ◽  
Author(s):  
M. E. Warren ◽  
R. E. Smith ◽  
G. A. Vawter ◽  
J. R. Wendt
Keyword(s):  
High Efficiency ◽  
Optical Element ◽  
Diffractive Optical Element

Processing and error compensation of diffractive optical element

2014 ◽  
Author(s):  
Yunlong Zhang ◽  
Zhibin Wang ◽  
Feng Zhang ◽  
Hui Qin ◽  
Junqi Li ◽  
...  
Keyword(s):  
Error Compensation ◽  
Optical Element ◽  
Diffractive Optical Element

Optimal design of a multilayer diffractive optical element for dual wavebands

2010 ◽  
Vol 35 (24) ◽  
pp. 4157 ◽  
Author(s):  
Changxi Xue ◽  
Qingfeng Cui ◽  
Tao Liu ◽  
Liangliang Yang ◽  
Bing Fei
Keyword(s):  
Optimal Design ◽  
Optical Element ◽  
Diffractive Optical Element

Characteristics of diffractive optical element for multispot beam homogenizing

2004 ◽  
Author(s):  
Takayuki Hirai ◽  
Keiji Fuse ◽  
Kenichi Kurisu ◽  
Keiji Ebata
Keyword(s):  
Optical Element ◽  
Diffractive Optical Element

Application of a Viscous Liquid as an Aerosol for Post-Operative Adhesion Prevention: First Engineering Steps Towards Nozzle Design

2020 ◽  
Author(s):  
P. Alex Smith ◽  
Timothy J. Keane ◽  
Stefano Serpelloni ◽  
Stephen G. Ramon ◽  
Francesca Taraballi
Keyword(s):  
Thin Film ◽  
Minimally Invasive ◽  
Viscous Liquid ◽  
Scar Tissue ◽  
Adhesion Prevention ◽  
Nozzle Design ◽  
Postoperative Adhesions ◽  
Internal Organs ◽  
Spray Pattern ◽  
3D Printed

Abstract Postoperative adhesions are scar tissue that form between internal organs after surgery, leading to devastating life-long complications. Current adhesion barriers used clinically are solid sheets which can only be applied in open surgeries through large incisions. We have developed a material which can be applied as a liquid in minimally invasive surgeries which transitions into a solid thin film barrier upon contact with warm tissue. However, to be effective, it must be sprayed, and spraying a viscous liquid consistently is challenging. We proposed using a gas dispersant to facilitate aerosolization. In this study, we compared a commercially available nozzle without gas dispersant to a custom 3D printed nozzle with gas dispersant. For comparison, we measured both spray pattern and stiffness of the resulting gel. We found that when sprayed with gas dispersant, the spray pattern covered a larger area, and the resulting gel was stiffer than when sprayed without gas dispersant.

Near-infrared diffractive optical element (DOE) radiometer

1994 ◽  
Author(s):  
Kelvin E. Hamilton ◽  
J. R. Michel Codere ◽  
J. J. M. Verreault ◽  
Earl J. Fjarlie
Keyword(s):  
Near Infrared ◽  
Optical Element ◽  
Diffractive Optical Element
Sign in / Sign up

Export Citation Format

Share Document