Laser Guide Star Operations in Astronomy

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1 Laser Guide Star Operations in Astronomy Gustavo Rahmer Laser Systems Engineer / LSO Large Binocular Telescope Observatory University of Arizona grahmer@lbto.org Page 1

2 Atmospheric Blurring: The killer of ground-based astronomy Source Page 2

3 Atmospheric Blurring: The killer of ground-based astronomy Source Short exposure image Page 3

4 Atmospheric Blurring: The killer of ground-based astronomy Source Short exposure image Long exposure image Page 4

5 Atmospheric Blurring: The killer of ground-based astronomy Page 5

6 Adaptive Optics (AO) The technology of sensing and removing atmospheric distortions Page 6

7 Adaptive Optics (AO) The technology of sensing and removing atmospheric distortions Page 7

8 Simplified AO system diagram Credit: Claire Max, UCSC Page 8

9 Adaptive Optics Page 9

10 Adaptive Optics Page 10

11 Adaptive Optics Page 11

12 Things are always complicated We need a bright reference star, but suitable stars are not found everywhere. Page 12

13 Things are always complicated We need a bright reference star, but suitable stars are not found everywhere. Page 13

14 Lasers to the rescue! Page 14

15 Two types of LGS Sodium (CW, 589 nm) Rayleigh (pulsed, 532 or 355 nm) Page 15

16 Laser Guide Star systems around the world Page 16

17 Safety in LGS operations Personnel/Equipment Page 17

18 Safety in LGS operations Personnel/Equipment Airplanes Page 18

19 Safety in LGS operations Personnel/Equipment Airplanes Satellites Page 19

20 Personnel and equipment safety Class 4 systems: power usually 20 to 100+ Watts (combined). Page 20

21 Personnel and equipment safety Class 4 systems: power usually 20 to 100+ Watts (combined). Regulation example: ARRA (Arizona Radiation Regulatory Agency) through the University of Arizona s Research Laboratory & Safety Services. Page 21

22 Personnel and equipment safety Class 4 systems: power usually 20 to 100+ Watts (combined). Regulation example: ARRA (Arizona Radiation Regulatory Agency) through the University of Arizona s Research Laboratory & Safety Services. Applicable Z136 standards: Z136.1: Safe Use of Lasers. Z136.6: Safe Use of Lasers Outdoors. Page 22

23 Personnel and equipment safety Class 4 systems: power usually 20 to 100+ Watts (combined). Regulation example: ARRA (Arizona Radiation Regulatory Agency) through the University of Arizona s Research Laboratory & Safety Services. Applicable Z136 standards: Z136.1: Safe Use of Lasers. Z136.6: Safe Use of Lasers Outdoors. Laser Controlled Area: usually the whole inside of the dome. Class 1 during daytime. Class 4 after walkthrough. Page 23

24 Personnel and equipment safety Page 24

25 Personnel and equipment safety Page 25

26 Aircraft safety Regulated by the FAA Page 26

27 Aircraft safety Regulated by the FAA FAA Advisory Circular 70-1 (2004) Page 27

28 Aircraft safety Regulated by the FAA FAA Advisory Circular 70-1 (2004) Registration process: Form Notice of Proposed Outdoor Laser Operations Page 28

29 Aircraft safety Regulated by the FAA FAA Advisory Circular 70-1 (2004) Registration process: Form Notice of Proposed Outdoor Laser Operations Letter of Determination: Location Minimum elevation angle Aircraft spotters Coordination requirements (ATC, Military) Page 29

30 Aircraft safety Regulated by the FAA FAA Advisory Circular 70-1 (2004) Registration process: Form Notice of Proposed Outdoor Laser Operations Letter of Determination: Location Minimum elevation angle Aircraft spotters Coordination requirements (ATC, Military) Page 30

31 Aircraft safety Regulated by the FAA FAA Advisory Circular 70-1 (2004) Registration process: Form Notice of Proposed Outdoor Laser Operations Letter of Determination: Location Minimum elevation angle Aircraft spotters Coordination requirements (ATC, Military) Page 31

32 Aircraft safety Page 32

33 Aircraft safety Page 33

34 Aircraft safety Automatic aircraft detection: Local radar. Cameras (Vis/IR). TBAD (Transponder-Based Aircraft Detection). Page 34

35 Aircraft safety Automatic aircraft detection: Local radar. Cameras (Vis/IR). TBAD (Transponder-Based Aircraft Detection). Page 35

36 Aircraft safety Automatic aircraft detection: Local radar. Cameras (Vis/IR). TBAD (Transponder-Based Aircraft Detection). SAE AS6029A, Performance Criteria for Laser Control Measures Used for Aviation Safety (2013). Page 36

37 Satellite avoidance DOD Instruction , Illumination of Objects in Space by Lasers (2000) All DoD laser activities shall be conducted in a safe and responsible manner that protects space systems, their mission effectiveness, and humans in space, consistent with national security requirements Page 37

38 Satellite avoidance DOD Instruction , Illumination of Objects in Space by Lasers (2000) All DoD laser activities shall be conducted in a safe and responsible manner that protects space systems, their mission effectiveness, and humans in space, consistent with national security requirements Groups involved: US Strategic Command's Joint Functional Component Command for Space (JFCC SPACE). Joint Space Operations Center (JSpOC). Laser Clearinghouse (LCH). Page 38

39 Satellite avoidance Page 39

40 Page 40

41 Page 41

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