Fraunhofer Institute of Optronics, System Technologies and Image Exploitation IOSB

Adaptive Optics

Adaptive Optics

Profile

Research activities in the Adaptive Optics Group at Fraunhofer IOSB revolve around imaging through turbulence (especially along horizontal paths and strong turbulence) and free-space laser communications. We are developing simulations, theoretical models, image processing software and adaptive optics systems. Light propagation along horizontal paths has unique challenges, quite different from astronomical adaptive optics, and therefore we promote unconventional approaches to the problem.


Read about the latest developments in our group, take a moment to peruse our publications, inform yourself about our laboratory equipment and the services we provide. Biographical information about the employees of the group is also provided. We welcome collaborations with the industry.

 

                  
                   



       

News

2018

June

Article/interview about adaptive optics in Photonics Spectra

Dr. Italo Toselli will be invited speaker at the “Environmental Effects on Light Propagation and Adaptive Systems” conference, part of SPIE Remote Sensing symposium, 10-13 September 2018, Berlin, Germany

May

Opening ceremony of the new laser communications laboratory

January

Dr. Italo Toselli will be invited speaker at the "Propagation through and Characterization of Atmospheric and Oceanic Phenomena" conference, part of OSA Imaging and Applied Optics Congress, 25-28 June 2018, Orlando, Florida, USA

Dr. Szymon Gladysz will be invited speaker at the 18th International Conference on Laser Optics (ICLO 2018), 4-8 June 2018, St. Petersburg, Russia

 


2017

September

Dr. Szymon Gladysz is guest editor for the Journal of Applied Remote Sensing, Special Section on Optics in Atmospheric Propagation and Adaptive Systems

July

Dr. Szymon Gladysz receives Fraunhofer IOSB publication prize

Dr. Szymon Gladysz will serve as Program Chair at the "Propagation Through and Characterization of Atmospheric and Oceanic Phenomena" conference, part of OSA Imaging and Applied Optics Congress in June 2018

January

Dr. Szymon Gladysz will be invited speaker at the "Propagation through and Characterization of Atmospheric and Oceanic Phenomena" conference, part of OSA Imaging and Applied Optics Congress in June 2017

 


2016

December

Dr. Szymon Gladysz will be co-chairing the 2017 SPIE conference "Optics in Atmospheric Propagation and Adaptive Systems"

September

Andreas Zepp wins the 1st Prize in the "Are You the Photonic Brain?" competition from Qioptiq

March

Dr. Szymon Gladysz is named guest editor for Optical Engineering’s Special Section on Long-Range Imaging

February

Dr. Szymon Gladysz receives a visiting scientist grant from the US Air Force 


2015

September

Lydia Yatcheva, M.Sc. student in the group, received the Best Student Paper Award at SPIE Remote Sensing 2015 for her paper "Ultimate turbulence experiment: simultaneous measurements of Cn2 near the ground using six devices and eight methods" (9641-4)

August

Dr. Szymon Gladysz is invited speaker at the "Laser Communication and Propagation through the Atmosphere and Oceans" conference, part of SPIE Optics + Photonics 2015

July

The AO group wins funding (275,000 €) for the construction of a laser communications laboratory from Fraunhofer central funds

June

Dr. Szymon Gladysz receives a visiting scientist grant from US Navy

Dr. Esdras Anzuola (Polytechnic University of Catalonia) wins the ERCIM Scholarship to carry out independent research in the AO group at Fraunhofer IOSB


2014

July

Dr. Szymon Gladysz receives Fraunhofer IOSB publication prize (2nd place)

June

The AO group organizes the "Advanced Threat Warning, Tracking and Laser Countermeasures in Atmospheric Turbulence" workshop in Ettlingen


2013

September

Dr. Italo Toselli (currently at the University of Miami) wins the ERCIM Scholarship to carry out independent research in the AO group at Fraunhofer IOSB

Services

We offer the following services to our industrial and governmental clients:

 

  • Measuring the influence of atmospheric turbulence on electro-optical devices to be deployed in realistic conditions outside the laboratory
     
  • Carrying-out field trials and instrument validation experiments
     
  • Cross-validation of proposed and existing measurement systems
     
  • Monte-Carlo and analytic calculations of laser propagation through the atmosphere
     
  • Simulation of the performance of imaging systems for long-range observations
     
  • Optical metrology
     
  • Design of optical systems
     
  • Simulation of adaptive-optical systems for lasers and for astronomy
     
  • Simulation of laser systems to be deployed underwater
     
  • Design and fabrication of holograms
     
  • Design and fabrication of micro-optics
     

Equipment

Our adaptive optics laboratory is equipped with state-of-the art devices for simulating, measuring and compensation of atmospheric turbulence. The following table gives an overview of the most important equipment we possess.

 

Device

Company

Main Characteristics

Deformable mirror “Multi DM”

Boston Micromachines

12x12 actuators, 4.6 kHz frame rate, 3.5 µm, Gold Coating

Deformable mirror “Mini DM”

Boston Micromachines

32 actuators, 20 kHz frame rate, 1.5 µm, Gold coating

Deformable mirror “DM-52”

Alpao

52 actuators, 800 Hz frame rate, 3 µm inter-actuator stroke

Arbitrary Waveform Generator

Tektronix

2−channel, 25 Gsamples per second, 2G samples record

Digital Oscilloscope

Tektronix

4 analog channels, 23 GHz Bandwidth

90-degree Optical Hybrid

Kylia

Two polarizations, 1520-1570 nm operating wavelength

IQ Optical Modulator

Thorlabs

Dual Mach-Zehnder interferometer, 35 GHz Bandwidth, 1525 - 1605 nm operating wavelength

High-frequency RF amplifier

Thorlabs

10 GHz bandwidth, 34 dB gain, max. output voltage 10 V.

Mode spatial multiplexer / demultiplexer

CAILabs

6 Laguerre-Gauss modes modes, 1550 nm operating wavelength, output in free space.

Fiber Laser

NKT Photonics

1550.12 nm wavelength, 100 mW

HeNe-Laser

several

Several from 5 mW to 35 mW, TEM00

4 Diodelaser with beam combiner (fiber-coupled)

Schäfter & Kirchhoff

4 combined laser with 405 nm, 488 nm, 520 nm and 660 nm, fiber-coupled

2x Balanced Photodetector

Finisar

43 GHz Bandwidth, FC/PC connector, 0.5 A/W responsivity

Silicon photo multiplier array

SensL

VIS, array of 8x8, pixel size 6mmx6mm

IR Camera

Edmund Optics

1500-1600 nm, 320 x 256 resolution, 30 x 30 µm2 Pixels, USB

Phosphor coated IR Camera

Ophir photonics

964x724 pixels, USB 2.0

CMOS detector “Osprey Scientific”

Raptor Photonics

VIS, 2048x2048 pixels, Camera link, 37.5 to 1000 fps

CCD detector “Fastcam”

Photron

VIS, 512x480 pixels, frame grabber, up to 10.000 fps

Shack-Hartmann sensor

Optocraft

1248x1080 pixels, exchangeable lenslet-arrays

Shack-Hartmann sensor “WFS20-7”

Thorlabs

1440x1080 Pixels, 150 µm Pitch, 69-880 fps

Shack-Hartmann sensor

Metrolux

1380x1040 pixels, 200 µm Pitch, 15 fps

2 x Liquid Crystal Spatial Light Modulator

Hamamatsu

1000-1550nm spectral range, 1280x1020 pixels, 60 Hz frame rate, DVI input signal

Liquid Crystal Spatial Light Modulator “Pluto”

Holoeye

VIS, 1920x1080 pixels, 60 Hz frame rate, DVI input signal

Turbulence simulator

Lexitek

2x motorized phase plates with 4096 x 4096 OPD array

Tip/Tilt mirror

NanoFaktur

2 axis, 4 mrad max. deplexion, 1.5 kHz bandwith, 0.2 µrad resolution.

Active beam stabilization

MRC Systems

2 Tilt mirrors, 2 4QD sensors

Real-time embedded processor

National Instruments

Artix-7-FPGA, Dual-Core-Controller with 4 Slots

Interferometer “µPhase 2 HR”

Fisba Optik

1000x1000 image points

Telescope “CGEM DX 925 HD“

Celestron

Aperture 235 mm, focal length 2032 mm

Telescope “CPC 800 XLT“

Celestron

Aperture 2350 mm, focal length 2032 mm

Ultrasonic Anemometer „HS50“                           

Gill Instruments

measurement frequency 50 Hz, asymmetric, 3-axis, 0-45 m/s wind speed, U,v,w vector output, minimal flow disturbance, speed of sound measurements

Surface-layer Laser- Scintillometer „SLS40”

SCINTEC AG

670 nm wave length, Cn², CT², inner scale, heat flux, time resolution 1 min, range 50-250 m

Boundary Layer Scintillometer BLS2000              

SCINTEC AG

Large aperture scintillometer, 880 nm, dual disk, range 500 m- 12km, 1756 VIS LEDs, 68 IR LEDs, crosswind, Ethernet

People

Current members

 

  • Samuel Bassaly
     
  • Julia Hofmann
     
  • Juan Acosta
     
  • José Pablo Montoya Vélez
     
  • Daniel Lechner
     

Past members

  • Francisco Molina-Martel, M.Sc.

  • Dr. Esdras Anzuola (visiting researcher)

  • Dr. Roberto Baena Gallé

  • Rui Barros, M.Sc.

  • Sarah Keary, M.Sc.

  • Pablo Marin, M.Sc.

  • Lydia Yatcheva, M.Sc.

  • Fernando Negredo, M.Sc. 

  • Ms. Öncü Benli

  • Ms. Stephanie Wollgarten

  • Mr. Carlos Rios

  • Claudia Hübner, Dipl.-Math., M.Sc.

  • Dr. Gabriele Marchi

  • Corinne Scheifling, Dipl.-Ing.