Thick lens chromatic effective focal length variation versus bending

2017 ◽  
Author(s):  
Scott W. Sparrold
Keyword(s):  
Focal Length ◽  
Length Variation ◽  
Effective Focal Length ◽  
Variation Versus ◽  
Thick Lens

scholarly journals Measuring the effective focal length and shape factor of a thick lens using a microscope

Optik ◽  
2015 ◽  
Vol 126 (19) ◽  
pp. 1965-1969
Author(s):  
Julián Espinosa ◽  
Jorge Pérez ◽  
Consuelo Hernández ◽  
David Mas ◽  
Carmen Vázquez
Keyword(s):  
Shape Factor ◽  
Focal Length ◽  
Effective Focal Length ◽  
Thick Lens

Spot size and effective focal length measurements for a fast axial flow CO2 laser

1997 ◽  
Author(s):  
Robert J. Steele ◽  
Phillip W. Fuerschbach ◽  
Danny O. MacCallum
Keyword(s):  
Co2 Laser ◽  
Focal Length ◽  
Axial Flow ◽  
Spot Size ◽  
Effective Focal Length ◽  
Length Measurements

A Ray Transfer Matrix Model for an Elastomeric Lens

2011 ◽  
Vol 110-116 ◽  
pp. 4145-4148
Author(s):  
Johanna Mae M. Indias ◽  
Clark Kendrick C. Go
Keyword(s):  
Transfer Matrix ◽  
Matrix Model ◽  
Focal Length ◽  
Effective Focal Length ◽  
Length Changes ◽  
Variable Focus ◽  
Tunable Lens

A Ray Transfer Matrix (RTM) of a variable-focus elastomeric fluidic lens is explored and modeled in this paper. A HeNe (543.45nm wavelength) laser is incident on the tunable lens and the effective focal length changes are explored based on this model. Results show that there are two possible focal lengths and that focal lengths are independent of the elastomer thickness.

Design of cooled infrared switch-zoom optical system with long effective focal length based on R-C system

2014 ◽  
Vol 7 (2) ◽  
pp. 293-300
Author(s):  
李刚 LI Gang ◽  
杨晓许 YANG Xiao-xu ◽  
张恒金 ZHANG Heng-jin ◽  
孙东岩 SUN Dong-yan
Keyword(s):  
Optical System ◽  
Focal Length ◽  
Effective Focal Length

Analysis of Seidel aberration coefficients of thick lens with arbitrary focal length

2018 ◽  
Author(s):  
Jirí Novák ◽  
Antonín Mikš ◽  
Pavel Novák ◽  
Petr Pokorný ◽  
Filip Smejkal
Keyword(s):  
Focal Length ◽  
Thick Lens

scholarly journals Focus-Adjustable Head Mounted Display with Off-Axis System

2020 ◽  
Vol 10 (21) ◽  
pp. 7931
Author(s):  
So Hyun Seo ◽  
Jae Myung Ryu ◽  
Hojong Choi
Keyword(s):  
Optical System ◽  
Optical Axis ◽  
Focal Length ◽  
Normal Vector ◽  
Effective Focal Length ◽  
Head Mounted Display ◽  
Conventional Methods ◽  
Angle Of Reflection

An off-axis system refers to an optical system in which the optical axis and the normal vector at the vertex of each surface do not match. An off-axis optical system can be applied in order to construct a thin and light optical system. In particular, the optical system used for a see-through head-mounted display (HMD) must be designed asymmetrically, with respect to the optical axis. Because the vision of a human is different for each individual, HMD requires focus adjustment. The effective focal length (EFL) of the optical system must be calculated to obtain the focus adjustment. However, the off-axis optical system cannot be calculated by conventional methods. In this study, the EFL was calculated by rotating the coordinates of the rays near the optical axis by the angle of reflection or refraction at the intersection of each surface, with the rays coinciding with the optical axis. The magnitude of movement of the micro-display for focus adjustment was obtained from the calculated EFL, for a see-through type HMD.

XXII.—Artificial Holograms and Astigmatism

1952 ◽  
Vol 63 (4) ◽  
pp. 313-323
Author(s):  
G. L. Rogers
Keyword(s):  
Detailed Analysis ◽  
Focal Length ◽  
Zone Plate ◽  
Type Ii ◽  
Limited Extent ◽  
Parallel Beam ◽  
Effective Focal Length ◽  
Scale Factors ◽  
Diffraction Microscopy ◽  
Lateral Scale

SynopsisExperiments in diffraction microscopy, previously described, are here continued. Special emphasis is now laid on verifying the theory by the production of an “artificial” hologram, by non-diffractive means, from data calculated for a relatively simple object. The assumed object is then reconstructed in the usual apparatus.A type II linear zone plate of limited width is studied as a particular case of an artificial hologram. It gives rise to an unexpected black artefact, which is explained by a detailed analysis of this particular zone plate, and is shown to be due to its limited extent.Experiments on twisting the linear zone plate skew to the reconstructing beam show that the effective focal length is affected astigmatically by a factor proportional to cos2θ, where θ is the angle of twist, for lines parallel to the axis of twist. Lines perpendicular to the axis of twist are unaffected.The production of a hologram in an astigmatic pencil and its subsequent reconstruction while skew to a parallel beam is described. It is found that the focal length differences can be corrected in this way, but that the lateral scale factors are only partially rectified.

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