Synthetic Sapphire Absorbance at 1064 nm

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Synthetic Sapphire Absorbance at 1064 nm

• Robert Berry
• 15 August 2002

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Motivation

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

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Method - PDS

• Pump Laser
• Probe Laser
• Optical Chopper
• Detector

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Procedure

• Optical Fiber
• Telescope
• Alignment
• Detection

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Optical Fiber

• Optical Fiber
• Telescope
• Alignment
• Detection

• Noise Reduction
• Maximizing Power Output

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Telescope

• Optical Fiber
• Telescope
• Alignment
• Detection

• Small Laser Waist
• 4 X

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Alignment

• Optical Fiber
• Telescope
• Alignment
• Detection

• Probe waist 42.2 mm
• Pump waist 32.4 mm

• Beams nearly intersecting

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Detection

• Optical Fiber
• Telescope
• Alignment
• Detection

• QUAD Cell
• Signal Analyzer

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Results

• False-Positive
• 2-D Mapping
• Linear Mapping

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False-Positive X
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False-Positive Y
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401 SNR
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2D Mapping
(grid is 40 mm square)
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Linear Mapping
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Thank you