Transcript Acousto-optics

Optical Technologies for
Challenging
Environments
Talk Outline
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Precision Optics
Optical Coating
Glass Engineering
Assembly and Bonding Technologies
Optical Fibre Components and Assemblies
Acousto-optics
Environmental Performance
Gooch & Housego: a Global Business
Geographical revenues:
Headcount: >500
Global locations
Revenue by currency:
USD
72%
GBP
21%
Euro
7%
8 manufacturing facilities (6 US, 2 UK)
2 R&D centres
6 Sales Offices
US
Asia Pacific
Europe
2010
50%
20%
30%
86% of sales outside the UK
2009
60%
13%
27%
Components & Materials & Systems
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G & H is a global supplier of precision optical components & subassemblies
– Acousto-optics
– Electro-optics
– Crystal Optics
– Fibre Optics
– Precision Optics
Gooch and Housego is a global supplier of optical instrumentation
– Hyper-spectral imaging
– Optical coherence tomography
– Spectroradiometers
Precision Optics
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Crystal Optics
– Birefringent filters & waveplates
– Rotators & depolarisers
– UV through to visible wavelengths
– Infra-red crystals grown in-house
Prisms
Windows
Lenses
Super-polishing
Super-polished substrates
Low scatter mirrors
Synchrotron Mirrors (Si)
EUV Mirrors
Precision Etalons
Sapphire Windows (8”)
Precision Polished Si Wafers
Flow Cells
Zerodur, fused silica, silicon,
silicon carbide, sapphire,
Pyrex, BK7, filter glass
Up to 18” parts
Super-polishing
Proprietary Process on custom equipment
Surface roughness <1Å
Surfaces have extremely low scatter <5ppm
Commercial
polish
Roughness = 5 Å
Very good
polish
Roughness = 1.9 Å
Superpolish
Roughness = 0.5 Å
All images taken with 132X Nomarski microscope
Beyond
superpolishing
Roughness = 0.2 A
Large high quality mirrors
Mirror substrates – very low scatter
Sizes: 13.5” dia x 6” thick, down to 3” dia x 1” thick
Up to 18” possible
Optical Coating Technologies
20 Chambers across three sites
Coating Technology
Resistance Source
E-beam Gun
Ion-assisted E-beam
Ion-beam Sputtering
Sol-Gel
Typical Chamber sizes
Bell Jar -
12” to 18”
Box Coater -
500mm to 1000mm
Sol Gel Baths -
parts up to 1m, 150kg
Optical Coating Types
AR – V, W, multiband and broadband
• Wavelengths 250nm – 16um
• high laser damage threshold
• (up to 3GW/cm2 20ns pulses 1064nm)
HR – ultra-high reflectivity, low scatter
Beamsplitters
Edge Filters, Short pass, Long pass, Band pass
Polarising filters
Custom Dielectric Filter
Dielectric Materials -TiO2, SiO2, Ta2O5, HfO2, ZrO2, Nb2O5, Al203, MgF2 SiC etc.
Metallic Materials – Cr, Ag, Au, Al, Ni, Pt, Si, Rh
Solgel Coatings
Glass Engineering
• Materials
•Optical & soda glass
•Glass ceramic
•Fused silica & crystal quartz
•Ruby, sapphire, YAG etc
•Ferrite and alumina ceramics
• Processes
•Multi-axis CNC machining
•Shaping, drilling & honing
•Grinding & polishing
•Flat, Cylindrical, Spherical
Glass Engineering
Cleaning of Substrates
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Variety of techniques chosen to
suit particular substrates
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Automated aqueous multistage
cleaners
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Proprietary spinner cleaning
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Solvent vapour degreasing
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Manual wiping with dry high
purity chemicals
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Custom designed jigging
Optical Assembly and Bonding Technologies
• Extensive cleanrooms
and laminar flow cabinets
• Optical contacting
• Cold metal bonding
• Adhesive free bonding
• Sol-gel bonding
• Low outgassing epoxies
• Paints
• Mechanical assemblies
• Custom design
Passive Fibre Optics
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Fused fibre optical branching components
– Wavelength combining
– Power combining
– Tap coupler/splitter
Photonic packaging capability
– Fibre coupled sources
– Fibre coupled detectors
Fibre optic module capability
– Optical sub-assemblies
Active Fibre Optics
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Singlemode Pump lasers
Multimode Pump lasers
Transmission lasers
Integrated Modules
High Speed Detectors
Acousto-Optic Modulators
Ruggedised Telcordia and
MIL-STD-883 and space
qualified products
Photonic Packaging
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Fibre pigtailed, recepticalized & free space sources
– Lasers & LEDs
– SLEDs & SOAs
– DFB, FP & VSELs
Fibre pigtailed & recepticalized detectors
– APDs & PIN diodes
– Arrays
– High powered fibre collimators
Micro-optic devices
– Thin film devices
– Isolators
– Fibre coupled AO
Fibre coupled Isolator
Fibre optic harness for SMOS Mission
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Low phase noise vs temperature
No electromagnetic emissions
Low weight and good flexibility
Splitter module based of concatenated
fused couplers
SMOS Satellite
Soil Moisture
Ocean Salinity
Case Study – Fibre Optic Gyroscopes
• G & H Torquay is a key supplier of gyro coupler
• EM4 is a key supplier of gyro sources
• Both supply Honeywell, G & H Torquay achieving this despite
ITAR and working through a TAA
• Next major programme is an upgrade of the GPS satellites
that are used extensively for many global applications
Reliability
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Regular Telcordia qualification (over 1 million components in the field)
– 1221 & 1209
Harsh Environment testing
– Military & avionic requirements
Customer specific testing programmes
– Sub-marine cable customers (outgassing & Gamma radiation)
– Avionic gyroscope customers
– Satellite customers
– Military customers
FIT rate <1 (1 FIT is 1x10E9 hours)
ISO9001
AS9100 & SC21
Submarine repeaters
Acousto-optics
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World leader in acousto-optic Q-switches
Space qualified Acousto optic modulators
UV Acousto-optic Tunable Filter for Altius payload
Acousto-optic Frequency shifters for Lisa Pathfinder
Customers
Quality & Assurance
• ISO 9001
• AS 9100
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