Outputs (312)

The E-ELT first light spectrograph HARMONI: capabilities and modes (2016)
Presentation / Conference Contribution

HARMONI is the E-ELT’s first light visible and near-infrared integral field spectrograph. It will provide four different spatial scales, ranging from coarse spaxels of 60 × 30 mas best suited for seeing limited observations, to 4 mas spaxels that Nyq... Read More about The E-ELT first light spectrograph HARMONI: capabilities and modes.

A four mirror anastigmat collimator design for optical payload calibration (2016)
Presentation / Conference Contribution

We present here a four mirror anastigmatic optical collimator design intended for the calibration of an earth observation satellite instrument. Specifically, the collimator is to be applied to the ground based calibration of the Sentinel-4/UVN instru... Read More about A four mirror anastigmat collimator design for optical payload calibration.

The integral field unit for the James Webb space telescope's near-infrared spectrograph (2017)
Presentation / Conference Contribution

The European Space Agency (ESA) is providing the Near Infrared Spectrograph (NIRSpec) developed by EADS Astrium GmbH to fly on the James Webb Space Telescope (JWST). NIRSpec covers the 0.6-5.0 µm domain. It will be primarily operated as a multi-objec... Read More about The integral field unit for the James Webb space telescope's near-infrared spectrograph.

Photometry and Spectrum measurements of the Laser Guide Star beam emission at Observatorio del Roque de Los Muchachos with the Gran Telescope Canarias (2017)
Presentation / Conference Contribution

In the past years ESO has built together with industry a transportable Laser Guide Star Unit (WLGSU) to test the laser technology while supporting some strategic experiments for the LGS-AO technologies. Since July 2016, the WLGSU has been installed a... Read More about Photometry and Spectrum measurements of the Laser Guide Star beam emission at Observatorio del Roque de Los Muchachos with the Gran Telescope Canarias.

Overview, design, and flight results from SuperBIT: a high-resolution, wide-field, visible-to-near-UV balloon-borne astronomical telescope (2018)
Presentation / Conference Contribution

Balloon-borne astronomy is a unique tool that allows for a level of image stability and significantly reduced atmospheric interference without the often prohibitive cost and long development time-scale that are characteristic of space-borne facility-... Read More about Overview, design, and flight results from SuperBIT: a high-resolution, wide-field, visible-to-near-UV balloon-borne astronomical telescope.

AO modal optimization in a live, beating zebrafish heart (2013)
Presentation / Conference Contribution

We report on the combinated use of heart synchronization and wavefront sensorless modal AO to enable significant improvement in image quality of a live transgenic zebrafish embryo heart, imaged with a light sheet microscope.

Wide field adaptive optics microscopy using both closed loop correction and image sharpness optimization (2011)
Presentation / Conference Contribution

We report on results from a wide field microscope fitted with adaptive optics. We describe results based on both image optimization (wavefront sensorless adaptive optics) and full closed loop correction.

Light sheet adaptive optics microscope for 3D live imaging (2013)
Presentation / Conference Contribution

We report on the incorporation of adaptive optics (AO) into the imaging arm of a selective plane illumination microscope (SPIM). SPIM has recently emerged as an important tool for life science research due to its ability to deliver high-speed, optica... Read More about Light sheet adaptive optics microscope for 3D live imaging.

Multi-purpose grating spectrograph for the 4-meter European Solar Telescope
Presentation / Conference Contribution

Feasibility study of an image slicer for future space application (2014)
Presentation / Conference Contribution

This communication presents the feasibility study of an image slicer for future space missions, especially for the integral field unit (IFU) of the SUVIT (Solar UV-Visible-IR telescope) spectro-polarimeter on board the Japanese-led solar space missio... Read More about Feasibility study of an image slicer for future space application.

New opportunities of freeform gratings using diamond machining (2018)
Presentation / Conference Contribution

With the recent development of new ultra fine aluminium alloys and progress in the field of directly machined freeform surfaces, diamond machined freeform gratings could play an important part in future spectrographs or integral field units, particul... Read More about New opportunities of freeform gratings using diamond machining.

Reducing the Field of View in Correlating Wavefront Sensors for Solar Adaptive Optics (2017)
Presentation / Conference Contribution

Wavefront sensing for solar adaptive optics currently requires the use of extended-field Shack-Hartmann wavefront sensors. Such wavefront sensors suffer from a reduced sensitivity to high altitude turbulence due effects of measuring wavefront gradien... Read More about Reducing the Field of View in Correlating Wavefront Sensors for Solar Adaptive Optics.

MOSAIC optical relay module: optical design, performance, and flexure analysis (2018)
Presentation / Conference Contribution

The Optical Relay Module of the MOSAIC multiple-object spectrograph is used to relay 400-1800nm light picked off from the ELT focal plane to either a fibre-based integral field unit or a natural guide star wavefront sensor. Here we present the prelim... Read More about MOSAIC optical relay module: optical design, performance, and flexure analysis.

Preliminary on-sky results of the CANARY experiment with an ELT-elongated sodium LGS (2017)
Presentation / Conference Contribution

We present on-sky results of wavefront sensing on an elongated LGS. These results are derived from observations made with the multi-object AO demonstrator CANARY on the William Herschel Telescope (WHT) in La Palma. The laser guide star is produced us... Read More about Preliminary on-sky results of the CANARY experiment with an ELT-elongated sodium LGS.

Design of freeform diffraction gratings: performance, limitations and potential applications (2018)
Presentation / Conference Contribution

Spectroscopy is a key technique in astronomy and nowadays most major telescopes include at least one spectrograph in their instrument suite. The dispersive element is one of the most important components and it defines the pupil size, spectral resolu... Read More about Design of freeform diffraction gratings: performance, limitations and potential applications.

The E-ELT multi-object spectrograph: latest news from MOSAIC
Presentation / Conference Contribution

Closed loop adaptive optics with a laser guide star for biological light microscopy (2012)
Presentation / Conference Contribution

We report on the development of a widefield microscope that achieves adaptive optics correction through the use of a wavefront sensor observing an artificial laser guide star induced within the sample. By generating this guide star at arbitrary posit... Read More about Closed loop adaptive optics with a laser guide star for biological light microscopy.

Realtime wavefront sensing in a SPIM microscope, and active aberration tracking (2015)
Presentation / Conference Contribution

Adaptive optics (AO) can potentially allow high resolution imaging deep inside living tissue, mitigating against the loss of resolution due to aberrations caused by overlying tissue. Closed-loop AO correction is particularly attractive for moving tis... Read More about Realtime wavefront sensing in a SPIM microscope, and active aberration tracking.

Diamond machining of a single shot ellipsoidal focusing plasma mirror (2016)
Presentation / Conference Contribution

Plasma mirrors have become an important tool in high power laser physics due to their ability to suppress laser pre-pulses and amplified spontaneous emission allowing a cleaner and sharper rising edge pulse to be focused onto a target. A PMMA ellipso... Read More about Diamond machining of a single shot ellipsoidal focusing plasma mirror.

Towards freeform curved blazed gratings using diamond machining (2016)
Presentation / Conference Contribution

Concave blazed gratings greatly simplify the architecture of spectrographs by reducing the number of optical components. The production of these gratings using diamond-machining offers practically no limits in the design of the grating substrate shap... Read More about Towards freeform curved blazed gratings using diamond machining.