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optical design of high aperture compact relay systems

Optical design of high aperture compact relay systems

引用

8th conference on current developments in optical design and optical engineering

作者： Nikolov, ID Univ Sofia Opt & Spect Dept BG-1126 Sofia Bulgaria

ISBN: (纸本)0819432652

Some results obtained in the realization of compact relay systems design are presented. Four optical configurations have been analyzed. Two symmetrical schemes were examined having field Smith's lenses for a image scaling of-ix. the achieved numerical aperture is up to 0.35 and the MTFs curves are at 40 cycles1/mm for a contrast ratio of 0.2. the third design has a large field of 40 mm but its F-number is about F/4.5. the last relay system is unsymmetrical. the scaling is 2x and the image field exceeds 50 mm. the aberration balancing results and the optical systems performance are illustrated.

关键词： optical design relay systems high-speed optics wide-angle lenses

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optical design of the Hobby-Eberly Telescope Four Mirror Spherical Aberration Corrector

Optical design of the Hobby-Eberly Telescope Four Mirror Sph...

引用

8th conference on current developments in optical design and optical engineering

作者： Jungquist, RK Eastman Kodak Co Commercial & Govt Syst Div Rochester NY 14650 USA

ISBN: (纸本)0819432652

the Hobby-Eberly Telescope uses a ii-meter diameter F/1.45 segmented spherical primary mirror. A spherical mirror of this size generates large amounts of spherical aberration. To be used successfully in a tilted optical Arecibo type telescope, the spherical aberration needs to be corrected. this means that tracking of astronomical targets is achieved through moving a tracker optical package which imposes somewhat severe packaging constraints. Given these packaging constraints, novel methods must be employed to correct the aberrations with the Spherical Aberration Corrector contained in the moving hacker optical package. the paper reviews the pertinent requirements, constraints and the resultant design of the Hobby-Eberly Telescope Four Mirror Spherical Aberration Corrector.

关键词： telescope design four mirror spherical aberration

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optical system design for excimer laser materials processing

Optical system design for excimer laser materials processing

引用

8th conference on current developments in optical design and optical engineering

作者： Unnebrink, L Henning, T Kreutz, EW Poprawe, R Rhein Westfal TH Aachen Lehrstuhl Lasertech D-52074 Aachen Germany

ISBN: (纸本)0819432652

Non-imaging integrators which can be used for laser beam homogenization in materials processing with excimer laser radiation are analysed with regards to geometrical and statistical optics. A model for the transversal degree of coherence of the laser radiation is presented in order to estimate the performance of the integrating devices for the partially coherent excimer laser radiation. this is necessary for a more relevant design of those elements than a design by geometric optical means only. the concept of non-imaging integrators is enhanced by separating the multifaceted element from the focusing lens. this separation provides more flexibility in the processing distance of the optical system. A further enhancement is the combination of such a system with an imaging lens in order to create a system which produces a top hat fluence distribution with variable size for materials processing applications.

关键词： excimer laser non-rotationally symmetric optical elements beam homogenization materials processing multifaceted beam integrators transversal degree of coherence

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optical design for Terrestrial Planet Finder

Optical design for Terrestrial Planet Finder

引用

8th conference on current developments in optical design and optical engineering

作者： Noecker, MC Leitch, J Kopp, G McComas, B Ball Aerosp & Technol Corp Boulder CO 80306 USA

ISBN: (纸本)0819432652

We describe the features of the optical system for Terrestrial Planet Finder, a space-based, cryogenic (35 K) interferometer for direct detection of Earth-type planets around nearby stars. Destructive interference in a stellar interferometer suppresses stellar glare by a factor of several thousand or more, and phase chopping distinguishes planet light from symmetric backgrounds. the mid-infrared (7-20 mu m) is favorable for detecting planetary emission relative to that from the star, and this spectral region also offers important molecular signatures indicative of key atmospheric gases.

关键词： Planets Interferometers Mirrors Nulling interferometry Stars Space telescopes Telescopes Space operations Beam splitters Sensors

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Stray light design and analysis of SIRTF CTA

Stray light design and analysis of SIRTF CTA

引用

8th conference on current developments in optical design and optical engineering

作者： Fleming, JC Ball Aerosp & Technol Corp Boulder CO 80306 USA

ISBN: (纸本)0819432652

Ball Aerospace is building the Cryogenic Telescope Assembly (CTA) for the Space InfraRed Telescope Facility (SIRTF) project and stray light control is a critical part of this effort. the heliocentric orbit where the Sun is never allowed to illuminate the CTA and the Earth is relatively far away is a key feature for stray light control. Mirror and paint BRDFs were measured at various SIRTF wavelengths in order to provide inputs for the stray light models. Stray light from telescope self emission, a distant point source, and the galaxy were analyzed. the design ensures that stray light will be less than 21% of the celestial background at all SIRTF wavelengths.

关键词： SIRTF stray light scatter thermal emission diffraction

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Precise algebraic method to solve the noncemented two-lens objective free from the aperture aberrations

Precise algebraic method to solve the noncemented two-lens o...

引用

8th conference on current developments in optical design and optical engineering

作者： Kryszczynski, T Inst Appl Opt Det Geometr Opt PL-03805 Warsaw Poland

ISBN: (纸本)0819432652

An original method to enable the exact solution for the noncemented two-lens objective by means of any number of simultaneous non-linear equations is described. the method is limited to spherical surfaces without decentrations. Separations and refractive indices of glasses are fixed. Ail curvatures of surfaces are indirectly determined in the final stage. the typical meridional aperture aberrations deal with aplanatic and achromatic conditions. Essence of the method relies on formulation functions which contain trigonometric expressions and are nested up to certain depth. the method uses the advanced professional mathematical software which is indispensable for serving the non-linear system of equations. Numerical examples confirm the helpfulness of the method.

关键词： algebraic methods of the optical design use of computer algebra to the optical design

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EFFECTS of optical feedback on the filamentation and mode control of broad-area semiconductor lasers

EFFECTS of optical feedback on the filamentation and mode co...

引用

8th conference on current developments in optical design and optical engineering

作者： Xu, W Wang, XD Gwynn, RB Worlock, JM Hwu, RJ Univ Utah Dept Elect Engn Salt Lake City UT 84112 USA

ISBN: (纸本)0819432652

In this work, modeling along with associate experiments of the broad-area laser with an external optical cavity which employs a mode-selecting mirror has been conducted to study the effects of optical feedback on the filamentation and mode control of broad-area semiconductor lasers. By using split-step FFT algorithm in a propagation model, mode profiles of the broad-area lasers with a spherical cavity are simulated in detail, the simulation results agree very well with experimental measurements and verify the validity of the simulation model. Mode control of broad-area semiconductor lasers has also been studies through employing the same simulation model and associates experiments have also been conducted. the results will be presented in this paper.

关键词： broad-area semiconductor lasers optical feedback filamentation mode control

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design constraints of high-bit-rate soliton communication systems

Design constraints of high-bit-rate soliton communication sy...

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8th conference on current developments in optical design and optical engineering

作者： Ferreira, MFS Univ Aveiro Dept Phys P-3800 Aveiro Portugal

ISBN: (纸本)0819432652

We have examined the main constraints on the design of single-channel, high-capacity soliton communication systems. Ln the average soliton regime, the Gordon-Haus timing jitter limits the bit rate to less than 7 Gb/s for transoceanic fiber links, while for shorter transmission distances the main limitation is fiber perturbations arising from discrete in-line amplification. the use of dispersion-decreasing fibers and of periodic optical, phase conjugation for jitter control can increase significantly the capacity of soliton communication systems. We found that the third-order dispersion assumes a prominent role in this case. Reducing this effect sufficiently, the main constraint becomes the soliton-soliton interactions and bit rates superior to 110 Gb/s can be achieved for amplifier spacings less than 80 km. For higher amplifier spacings the bit rate is limited by the Raman induced timing jitter.

关键词： optical solitons optical communication systems nonlinear fiber optics

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Dispersion sensitivity of large scale axial gradient index glass for spherochromat doublets

Dispersion sensitivity of large scale axial gradient index g...

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8th conference on current developments in optical design and optical engineering

作者： Manhart, PK Hunter, BV Blankenbecler, R Raytheon Missile Syst Co Tucson AZ 85734 USA

ISBN: (纸本)0819432652

Bi-AGRIN cemented doublets, super corrected for zero axial color, spherical aberration and sphero-chromatism (we will call them spherochromats) can show polychromatic performance in the range of 0.004 waves PV or better at the red and blue wavelengths for speeds up to F/2, (0.06 waves PV of F/1.5). these doublets are comprised of two elements of axial gradient index glass. the crown and flint elements are each designed with separate and distinct gradient glass lines, giving each element an axial gradient in refractive index and dispersion(1). this paper examines one design and its performance sensitivity to dispersion modeling via the Buchdahl and Sellmeier dispersion equations.

关键词： optical design gradient index gradient dispersion macro AGRIN large scale AGRIN GRADIUM glass lines spherochromat high performance axial color sphero-chromatism

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Progress report on the optical system for closed-loop testing of the multiple mirror telescope adaptive secondary mirror

Progress report on the optical system for closed-loop testin...

引用

8th conference on current developments in optical design and optical engineering

作者： Sarlot, RJ Bresloff, CJ Burge, JH Fitz-Patrick, BC McGuire, PC Stamper, BL Zhao, CY Univ Arizona Steward Observ Tucson AZ 85721 USA

ISBN: (纸本)0819432652

Steward Observatory is completing the manufacture of a deformable f/15 secondary mirror for the 6.5m Multiple Mirror Telescope conversion that will, along with the wavefront sensing system, compensate for atmospheric turbulence. A potential difficulty of an adaptive secondary mirror is the ability to verify the commanded mirror shapes of a large convex deformable surface. An optical design is presently being implemented to test the deformable mirror's closed loop control system by optically projecting an artificial star to simulate starlight in the actual telescope. the test system has been designed to verify the control system by fitting into both a laboratory test structure as well as the telescope support structure itself. the optical design relies on two wavelength computer generated holograms used to remove spherical aberration as well as aid in the alignment of the test system optics by projecting alignment patterns.

关键词： adaptive secondary aspheric testing Multiple Mirror Telescope Shimmulator

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