Thermal refocusing method for spaceborne high-resolution optical imagers

Date

2016-05-20

Author

Selimoglu, Ozgur
Ekinci, Mustafa
Karci, Ozgur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

186
views

0
downloads

We describe the design of a thermal refocusing method for spaceborne high-resolution imagers where Korsch optical design is usually implemented. The secondary mirror is made of aluminum, a high thermal expansion coefficient material, instead of conventional zero-expansion glass ceramics. In this way, the radius of the curvature can be controlled by means of temperature change of the mirror. Change in the radius of curvature also changes the effective focal length of the camera which is used for compensation of the defocus that occurred in space. We show that the 30 mu m despace of the secondary mirror in the optical system can be compensated by an similar to 10 degrees C temperature change of the mirror while the image quality is maintained. (C) 2016 Optical Society of America

Subject Keywords

Optics

URI

https://hdl.handle.net/11511/67059

Journal

APPLIED OPTICS

DOI

https://doi.org/10.1364/ao.55.004109

Collections

Unclassified, Article

Suggestions

OpenMETU
Core

Cartesian Grid Mapper: Transformation Media for Modeling Arbitrary Curved Boundaries With Cartesian Grids ÖZGÜN, ÖZLEM; Kuzuoğlu, Mustafa (2014-01-01) A transformation electromagnetics-based approach is presented to facilitate the use of fixed Cartesian grids for modeling arbitrarily shaped (convex or nonconvex) curved boundaries in finite methods. The basic idea is to design transformation media adapted to the Cartesian grid by using the duality between the material parameters of the media and the coordinate transformation that maps the points of the Cartesian grid to the points on the original curved boundary. Such a transformation medium is named Carte...
Design and analysis of ultrashort femtosecond laser amplifiers Doğan, Ersin; Bilikmen, Kadri Sinan; Department of Physics (2006) This thesis presents a compact femtosecond laser amplifier design for optical preamplifiers and power amplifiers consist of theoretical perspective, simulations to analyze and optimize beam performance. The propagation through optical media is simulated for every optical component such as mirrors and nonlinear crystal separately and suggested realignment of these components required increasing amplifier performance. Finally Gaussian beam propagation and aberration compensation has been conducted.
Low temperature operation of APD for quantum cryptographic applications Kale, Zuhal; Ergül, Rüyal; Department of Electrical and Electronics Engineering (2005) This thesis explains low temperature operation of an InGaAs Avalanche Photo Diode (APD) cooled using thermoelectric coolers in order to utilize in the quantum cryptographic applications. A theoretical background for the equipment used in the experiment was provided. Circuitry and mechanics used for the low temperature operation were designed. Performance measures for APD were explained and experiment results were presented.
Design and construction of a cw mode nd:YAG laser prototype Eryılmaz, Ertan; Esendemir, Akif; Department of Physics (2004) In this thesis a theoretical background of Nd:YAG lasers has been presented and key parameters of a design have been stated. Both pulsed mode and CW mode designs have been made; a 500mJ xenon flash lamp has been investigated as the pulsed light source and a 500W tungsten halogen lamp has been used as the continuous light source for optical pumping. Closed cooling system has been constructed. De-ionized water has been used as coolant. The goal has been acomplished by constructing a CW mode prototype. The out...
Design and construction of a cw mode nd : yag laser prototype Eryılmaz, Ertan; Esendemir, Akif; Department of Physics (2004) In this thesis a theoretical background of Nd:YAG lasers has been presented and key parameters of a design have been stated. Both pulsed mode and CW mode designs have been made; a 500mJ xenon flash lamp has been investigated as the pulsed light source and a 500W tungsten halogen lamp has been used as the continuous light source for optical pumping. Closed cooling system has been constructed. De-ionized water has been used as coolant. The goal has been acomplished by constructing a CW mode prototype. The out...

Citation Formats

O. Selimoglu, M. Ekinci, and O. Karci, “Thermal refocusing method for spaceborne high-resolution optical imagers,” APPLIED OPTICS, pp. 4109–4112, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/67059.