Synthetic Sapphire Absorbance at 1064 nm Robert Berry 15 August 2002
Motivation Attractive physical properties. LIGO II (Advanced LIGO) demands higher sensitivity. Absorbance characterization needed.
Method - PDS Pump Laser Probe Laser Optical Chopper Detector
Procedure Optical Fiber Telescope Alignment Detection
Optical Fiber Noise Reduction Maximizing Power Output Optical Fiber Telescope Alignment Detection Optical Fiber Noise Reduction Maximizing Power Output
Telescope Small Laser Waist 4 X Optical Fiber Telescope Alignment Detection Telescope Small Laser Waist 4 X
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
Detection QUAD Cell Signal Analyzer Optical Fiber Telescope Alignment
Results False-Positive 2-D Mapping Linear Mapping
False-Positive: X
False-Positive: Y
40:1 SNR
2D Mapping (grid is 40 mm square)
Linear Mapping
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