1. Synthetic Sapphire Absorbance at 1064 nm
Robert Berry
15 August 2002

2. Motivation Attractive physical properties.
LIGO II (Advanced LIGO) demands higher sensitivity.
Absorbance characterization needed.

3. Method - PDS
Pump Laser
Probe Laser
Optical Chopper
Detector

4. Procedure
Optical Fiber
Telescope
Alignment
Detection

5. Optical Fiber Noise Reduction Maximizing Power Output Optical Fiber
Telescope
Alignment
Detection
Optical Fiber
Noise Reduction
Maximizing Power Output

6. Telescope Small Laser Waist 4 X Optical Fiber Telescope Alignment
Detection
Telescope
Small Laser Waist
4 X

7. Alignment Probe waist: 42.2 mm Beams nearly intersecting
Optical Fiber
Telescope
Alignment
Detection
Alignment
Probe waist: 42.2 mm
Pump waist: 32.4 mm
Beams nearly intersecting

8. Detection QUAD Cell Signal Analyzer Optical Fiber Telescope Alignment

9. Results
False-Positive
2-D Mapping
Linear Mapping

10. False-Positive: X

11. False-Positive: Y

12. 40:1 SNR

13. 2D Mapping
(grid is 40 mm square)

14. Linear Mapping

15. Thank you