Ms. Wenli Xu Profile

Wenli Xu

Optical System Engineering at Optical System Engineering

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Publications (31)

PROCEEDINGS ARTICLE | July 8, 2018

4MOST: status of the high resolution spectrograph

Proc. SPIE. 10702, Ground-based and Airborne Instrumentation for Astronomy VII

KEYWORDS: Optical components, Telescopes, Spectrographs, Cameras, Sensors, Collimators, Space telescopes, Optical benches, Optics manufacturing, Camera shutters

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PROCEEDINGS ARTICLE | November 17, 2016

CARMENES: an overview six months after first light

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

KEYWORDS: Observatories, Telescopes, Spectrographs, Fabry–Perot interferometers, Stars, Calibration, Lamps, Control systems, Data archive systems, Planets

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PROCEEDINGS ARTICLE | August 9, 2016

4MOST: the high-resolution spectrograph

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

KEYWORDS: Optical components, Telescopes, Spectrographs, Cameras, Sensors, Interfaces, Collimators, Head, Space telescopes, Optical benches

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PROCEEDINGS ARTICLE | August 9, 2016

CARMENES: the VIS channel spectrograph in operation

Proc. SPIE. 9908, Ground-based and Airborne Instrumentation for Astronomy VI

KEYWORDS: Optical fibers, Observatories, Telescopes, Spectrographs, Visible radiation, Fabry–Perot interferometers, Cameras, Sensors, Calibration, Spectral resolution

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PROCEEDINGS ARTICLE | August 7, 2014

MUSE field splitter unit: fan-shaped separator for 24 integral field units

Proc. SPIE. 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation

KEYWORDS: Telescopes, Mirrors, Spectrographs, Manufacturing, Image quality, Relays, Vignetting, Optical alignment, Tolerancing, Optics manufacturing

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MUSE (Multi Unit Spectroscopic Explorer) is a second generation Very Large Telescope (VLT) integral field spectrograph developed for the European Southern Observatory (ESO). It combines a 1’ x 1’ field of view sampled at 0.2 arcsec for its Wide Field Mode (WFM) and a 7.5"x7.5" field of view for its Narrow Field Mode (NFM). Both modes will operate with the improved spatial resolution provided by GALACSI (Ground Atmospheric Layer Adaptive Optics for Spectroscopic Imaging), that will use the VLT deformable secondary mirror and 4 Laser Guide Stars (LGS) foreseen in 2015. MUSE operates in the visible wavelength range (0.465-0.93 μm). A consortium of seven institutes is currently commissioning MUSE in the Very Large Telescope for the Preliminary Acceptance in Chile, scheduled for September, 2014. MUSE is composed of several subsystems which are under the responsibility of each institute. The Fore Optics derotates and anamorphoses the image at the focal plane. A Splitting and Relay Optics feed the 24 identical Integral Field Units (IFU), that are mounted within a large monolithic instrument mechanical structure. Each IFU incorporates an image slicer, a fully refractive spectrograph with VPH-grating and a detector system connected to a global vacuum and cryogenic system. During 2012 and 2013, all MUSE subsystems were integrated, aligned and tested to the P.I. institute at Lyon. After successful PAE in September 2013, MUSE instrument was shipped to the Very Large Telescope in Chile where it was aligned and tested in ESO integration hall at Paranal. After, MUSE was directly transferred in monolithic way onto VLT telescope where the first light was achieved. This paper describes the MUSE main optical component: the Field Splitter Unit. It splits the VLT image into 24 subfields and provides the first separation of the beam for the 24 Integral Field Units. This talk depicts its manufacturing at Winlight Optics and its alignment into MUSE instrument. The success of the MUSE alignment is demonstrated by the excellent results obtained onto MUSE positioning, image quality and throughput onto the sky. MUSE commissioning at the VLT is planned for September, 2014.

PROCEEDINGS ARTICLE | August 4, 2014

TOAD: a numerical model for the 4MOST instrument

Proc. SPIE. 9150, Modeling, Systems Engineering, and Project Management for Astronomy VI

KEYWORDS: Target detection, Point spread functions, Telescopes, Spectrographs, Sensors, Image sensors, Electroluminescent displays, Atmospheric modeling, Systems modeling, Device simulation

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PROCEEDINGS ARTICLE | July 24, 2014

The 4MOST instrument concept overview

Proc. SPIE. 9147, Ground-based and Airborne Instrumentation for Astronomy V

KEYWORDS: Telescopes, Spectrographs, Optical design, Metrology, Sensors, Calibration, Ions, Control systems, Neodymium, Optical instrument design

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PROCEEDINGS ARTICLE | October 5, 2012

CARMENES. I: instrument and survey overview

Proc. SPIE. 8446, Ground-based and Airborne Instrumentation for Astronomy IV

KEYWORDS: Optical fibers, Near infrared, Telescopes, Spectrographs, Stars, Sensors, Calibration, Lamps, Exoplanets, Planets

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PROCEEDINGS ARTICLE | September 24, 2012

Performance of the main instrument structure and the optical relay system of MUSE

Proc. SPIE. 8446, Ground-based and Airborne Instrumentation for Astronomy IV

KEYWORDS: Telescopes, Mirrors, Spectrographs, Imaging systems, Lenses, Relays, Aluminum, Integrated optics, Device simulation, Channel projecting optics

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PROCEEDINGS ARTICLE | September 24, 2012

CARMENES. II: optical and opto-mechanical design

Proc. SPIE. 8446, Ground-based and Airborne Instrumentation for Astronomy IV

KEYWORDS: Optomechanical design, Near infrared, Telescopes, Mirrors, Spectrographs, Cameras, Sensors, Calibration, Collimators, Optical benches

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PROCEEDINGS ARTICLE | September 24, 2012

MUSE optical alignment procedure

Proc. SPIE. 8446, Ground-based and Airborne Instrumentation for Astronomy IV

KEYWORDS: Telescopes, Mirrors, Spectrographs, Sensors, Calibration, Copper, Interfaces, Image quality, Relays, Optical alignment

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PROCEEDINGS ARTICLE | September 22, 2011

Optical design of the VLT/MUSE instrument

Proc. SPIE. 8167, Optical Design and Engineering IV

KEYWORDS: Mirrors, Spectrographs, Optical design, Prisms, Metrology, Surface plasmons, Reflection, Copper, Relays, Charge-coupled devices

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PROCEEDINGS ARTICLE | September 22, 2011

MUSE splitting and relay optics: a fan-shaped bridge for 24 spectrographs

Proc. SPIE. 8167, Optical Design and Engineering IV

KEYWORDS: Mirrors, Spectrographs, Adaptive optics, 3D modeling, Relays, Bridges, Optical alignment, Tolerancing, Prototyping, Channel projecting optics

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PROCEEDINGS ARTICLE | July 20, 2010

Analyzing the MUSE opto-mechanics serving as an optical bench in 3D space

Proc. SPIE. 7735, Ground-based and Airborne Instrumentation for Astronomy III

KEYWORDS: Optomechanical design, Optical components, Zemax, Telescopes, Mirrors, Spectrographs, Earthquakes, Relays, Finite element methods, Aluminum

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PROCEEDINGS ARTICLE | July 15, 2010

CARMENES: Calar Alto high-resolution search for M dwarfs with exo-earths with a near-infrared Echelle spectrograph

Proc. SPIE. 7735, Ground-based and Airborne Instrumentation for Astronomy III

KEYWORDS: Optical fibers, Telescopes, Spectrographs, Stars, Sensors, Calibration, Lamps, Exoplanets, Spectral resolution, Planets

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PROCEEDINGS ARTICLE | July 11, 2008

MUSE: feeding and mounting 24 spectrographs

Proc. SPIE. 7014, Ground-based and Airborne Instrumentation for Astronomy II

KEYWORDS: Telescopes, Mirrors, Spectrographs, Aerospace engineering, Lenses, Earthquakes, Space telescopes, Relays, Optical mounts, Channel projecting optics

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PROCEEDINGS ARTICLE | June 27, 2006

LINC-NIRVANA: optical design of an interferometric imaging camera

Proc. SPIE. 6269, Ground-based and Airborne Instrumentation for Astronomy

KEYWORDS: Diffraction, Point spread functions, Telescopes, Mirrors, Optical design, Cameras, Interfaces, Interferometry, Collimators, Optical alignment

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PROCEEDINGS ARTICLE | October 25, 2004

LINC-NIRVANA: mechanical challanges of the MCAO wavefront sensor

Proc. SPIE. 5490, Advancements in Adaptive Optics

KEYWORDS: Optical components, Telescopes, Mirrors, Stars, Cameras, Sensors, Wavefront sensors, Adaptive optics, Finite element methods, Selenium

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PROCEEDINGS ARTICLE | October 25, 2004

LINC-NIRVANA: the single arm MCAO experiment

Proc. SPIE. 5490, Advancements in Adaptive Optics

KEYWORDS: Actuators, Telescopes, Mirrors, Stars, Interferometers, Cameras, Wavefront sensors, Adaptive optics, Deformable mirrors, Temperature metrology

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PROCEEDINGS ARTICLE | October 25, 2004

LINC-NIRVANA: how to get a 23-m wavefront nearly flat

Proc. SPIE. 5490, Advancements in Adaptive Optics

KEYWORDS: Actuators, Telescopes, Mirrors, Stars, Sensors, Interferometry, Wavefront sensors, Wavefronts, Adaptive optics, Turbulence

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PROCEEDINGS ARTICLE | September 30, 2004

LUCIFER status report, summer 2004

Proc. SPIE. 5492, Ground-based Instrumentation for Astronomy

KEYWORDS: Near infrared, Optical filters, Mirrors, Spectrographs, Cameras, Sensors, Manufacturing, Control systems, Java, Molybdenum

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PROCEEDINGS ARTICLE | July 7, 2004

LINC-NIRVANA: first attempt of an instrument for a 23-m-class telescope

Proc. SPIE. 5382, Second Backaskog Workshop on Extremely Large Telescopes

KEYWORDS: Telescopes, Mirrors, Stars, Cameras, Sensors, Wavefront sensors, Adaptive optics, Deformable mirrors, Collimators, Optical instrument design

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PROCEEDINGS ARTICLE | July 7, 2004

Layer-Oriented on paper, laboratory, and soon on the sky

Proc. SPIE. 5382, Second Backaskog Workshop on Extremely Large Telescopes

KEYWORDS: Telescopes, Mirrors, Stars, Sensors, Interferometry, Wavefront sensors, Wavefronts, Adaptive optics, Deformable mirrors, Prototyping

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Layer Oriented represented in the last few years a new and promising aproach to solve the problems related to the limited field of view achieved by classical Adaptive Optics systems. It is basically a different approach to multi conjugate adaptive optics, in which pupil plane wavefront sensors (like the pyramid one) are conjugated to the same altitudes as the deformable mirrors. Each wavefront sensor is independently driving its conjugated deformable mirror thus simplifying strongly the complexity of the wavefront computers used to reconstruct the deformations and drive the mirror themselves, fact that can become very important in the case of extremely large telescopes where the complexity is a serious issue. The fact of using pupil plane wavefront sensors allow for optical co-addition of the light at the level of the detector thus increasing the SNR of the system and permitting the usage of faint stars, improving the efficiency of the wavefront sensor. Furthermore if coupled to the Pyramid wavefront sensor (because of its high sensitivity), this technique is actually peforming a very efficient usage of the light leading to the expectation that, even by using only natural guide stars, a good sky coverage can be achieved, above all in the case of giant telescopes. These are the main reasons for which in the last two years several projects decided to make MCAO systems based on the Layer Oriented technique. This is the case of MAD (an MCAO demonstrator that ESO is building with one wavefront sensing channel based on the Layer Oriented concept) and NIRVANA (an instrument for LBT). Few months ago we built and successfully tested a first prototype of a layer oriented wavefront sensor and experiments and demonstrations on the sky are foreseen even before the effective first light of the above mentioned instruments. The current situation of all these projects is presented, including the extensive laboratory testing and the on-going experiments on the sky.

PROCEEDINGS ARTICLE | December 24, 2003

Layer-oriented MCAO projects and experiments: an update

Proc. SPIE. 5169, Astronomical Adaptive Optics Systems and Applications

KEYWORDS: Telescopes, Astronomy, Stars, Interferometers, Sensors, Interferometry, Wavefront sensors, Adaptive optics, Astronomical telescopes, Prototyping

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PROCEEDINGS ARTICLE | March 7, 2003

LUCIFER: a multimode NIR instrument for the LBT

Proc. SPIE. 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes

KEYWORDS: Near infrared, Telescopes, Mirrors, Electronics, Cameras, Sensors, Imaging spectroscopy, Control systems, Molybdenum, Spectroscopes

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PROCEEDINGS ARTICLE | February 7, 2003

Visible MCAO channel for NIRVANA at the LBT

Proc. SPIE. 4839, Adaptive Optical System Technologies II

KEYWORDS: Telescopes, Mirrors, Stars, Cameras, Sensors, Interferometry, Wavefront sensors, Deformable mirrors, Atmospheric corrections, Space telescopes

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PROCEEDINGS ARTICLE | February 7, 2003

Phase screens for astronomical multiconjugate adaptive optics: application to MAPS

Proc. SPIE. 4839, Adaptive Optical System Technologies II

KEYWORDS: Monochromatic aberrations, Telescopes, Refractive index, Mirrors, Optical design, Glasses, Wavefronts, Adaptive optics, Turbulence, Atmospheric optics

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PROCEEDINGS ARTICLE | January 30, 2003

Optical glasses with high NIR transmission

Proc. SPIE. 4842, Specialized Optical Developments in Astronomy

KEYWORDS: Near infrared, Refractive index, Optical design, Lenses, Cameras, Glasses, Zinc, Colorimetry, Infrared radiation, Infrared materials

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PROCEEDINGS ARTICLE | August 16, 2000

Commissioning of the FORS instruments at the ESO VLT

Proc. SPIE. 4008, Optical and IR Telescope Instrumentation and Detectors

KEYWORDS: Telescopes, Stars, Polarization, Sensors, Calibration, Imaging spectroscopy, Image quality, Charge-coupled devices, Astronomical imaging, Spectroscopes

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PROCEEDINGS ARTICLE | August 16, 2000

Low-resolution spectrograph for LAMOST

Proc. SPIE. 4008, Optical and IR Telescope Instrumentation and Detectors

KEYWORDS: Optical fibers, Telescopes, Spectrographs, Optical design, Cameras, Reflectivity, Collimators, Charge-coupled devices, Lawrencium, Diffraction gratings

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PROCEEDINGS ARTICLE | August 16, 2000

LUCIFER: a NIR spectrograph and imager for the LBT

Proc. SPIE. 4008, Optical and IR Telescope Instrumentation and Detectors

KEYWORDS: Optical fibers, Diffraction, Telescopes, Mirrors, Electronics, Cameras, Sensors, Imaging spectroscopy, Control systems, Spectroscopes

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Showing 5 of 31 publications

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