GOOCH & HOUSEGO NOVEL OPTICAL COMPONENTS FOR THE IR
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1 GOOCH & HOUSEGO NOVEL OPTICAL COMPONENTS FOR THE IR June 017
2 Gooch & Housego NOVEL Optical components for the IR Acousto-Optic components for:- µm < λ < 4µm Novel Optical Components Slide
3 ACOUSTO OPTICS Acousto-Optics: the interaction between sound waves and light waves, especially the diffraction of laser light by ultrasound (Wikipedia) Ultrasound generates a regular refractive index variation (photoelastic-effect) in a suitable medium that acts as a (travelling) diffraction-grating. Strong diffraction occurs when certain matching conditions are satisfied optical wavelength & direction acoustic frequency & direction acoustic power Main types of AO device Modulators, Pulse-Pickers & Cavity Dumpers Deflectors Frequency-Shifters Mode Lockers Q Switches Tunable Filters Novel Optical Components Slide 3
4 AO Basics The Diffraction Efficiency (η) is defined as I I π L M Hλ D Int = η sin 0 P a Where; I D - Intensity in diffracted order I 0 - Intensity in 0 order (no diffraction) L int - Interaction Length H - Active Aperture P a - Acoustic Power M - AO Figure of Merit (material dependent) M P 0 = = n 3 o n 3 e ρv eff 3 p λ H L M int Peak Diffraction Efficiency when P a = P 0 NOTE λ DEPENDENCE! Novel Optical Components Slide 4
5 Choice of Material The optical medium should be transparent over the required operational range - Optical damage threshold must be adequate The material should have good Acousto-Optic properties - Efficient AO interaction - Reasonable acoustic attenuation - Compatible with manufacturing process Single Crystal Tellurium Dioxide (Te0 ) - 400nm 4 5µm - Grown along the t [110] direction; ie rotated at 45º about the [001] direction Novel Optical Components Slide 5
6 AO Interaction in TeO (isotropic) Novel Optical Components Slide 6
7 AOQS ( 9µm) Q-Switching of laser Interaction material: Tellurium Dioxide Wavelength: 750 < λ < 3000nm Damage threshold: > 50MW/cm AR coating reflectivity: < 0 5% per surface Transmission: > 95 0% Frequency: 40 68MHz Optical polarisation: Random Active aperture: 1 5mm Acoustic mode: Compressional Separation angle: 7 9µm Rise-time (10-90%): 153ns/mm Loss modulation: 80% Maximum RF power: 10W Demonstrated by Lisa Laser in their Er:ZBLAN fibre laser. Pulse energy 560µJ at pulse rep-rate of 1kHz, pulse-width 69ns Peak power 10 6kW. Novel Optical Components Slide 7
8 AOTF: What is an AOTF? An AOTF (Acousto Optic Tunable Filter) is an optical passband filter that is tunable Ultrasound diffracts light that satisfies certain matching conditions; especially optical and acoustic wavelengths (and therefore acoustic frequency). As a result, the key filter parameters - centre wavelength & throughput (ie intensity of diffracted light) - are under complete electronic control. There are no moving parts, no maintenance, and an indefinite lifetime. Novel Optical Components Slide 8
9 Schematic (typical general-purpose AOTF) O-ray incident shown Uses anisotropic interaction with acoustic slow-shear mode Non-collinear AOTF parallel-tangents design Wide field-of-view Rise-time <10µs True random-access Beam-steering compensation to maintain pointing-stability Novel Optical Components Slide 9
10 Conventional AOTF: wavelength range 4 5µm 80 RESOLUTION 1 DRIVE POWER 100 DE at Given Wavelength Resolution δλ / λ ~ 1% Resolution - nm 40 Drive Power (Pk DE) - W 8 6 DE - % Wavelength - µm Active aperture 8mm x 8mm Wavelength range: 4 5µm Transducer length: 4mm 3 4 Wavelength - µm Drive Power - W µm 3 5µm 4 5µm RF Drive-Power > 5W Thermal Management Issues! Novel Optical Components Slide 10
11 Acoustically Resonant AOTF Conventional AOTF: The sound is deflected by an acoustic wedge followed by an acoustic absorber Resonant AOTF: The sound is totally internally reflected at an air-boundary parallel to the transducer. This allows the sound to be recycled giving an advantage in drive-power efficiency Acoustic Absorber Conventional Configuration Resonant Configuration Novel Optical Components Slide 11
12 Resonant AOTF - External View Temperature compensation Data cable for temperature compensation RF connector Novel Optical Components Slide 1
13 Resonant AOTF Internal View Temperature sensors Heat Pump T1 T Peltier Digital Temperature Sensor (±0.03 C) Novel Optical Components Slide 13
14 Effect of the resonant acoustic cavity on the RF impedance-matching On resonance : no feedback signal from ultrasonic transducer Off resonance: feedback signal from ultrasonic transducer; VSWR goes high(>3:1) Off resonance On resonance Novel Optical Components Slide 14
15 Resonant AOTF: results (λ = 1µm-µm) Novel Optical Components Slide 15
16 Resonant AOTF: DE Vs. RF power Laser source: 3390nm Advantage factor predicted: 5 Advantage factor measured: Temperature compensation: used Novel Optical Components Slide 16
![AOTF Technology Quasi-Collinear Configuration [001] AOTF is Configured so that the direction Acoustic Phase-Velocity Group Velocity is parallel (collinear) with optical direction Sound is](/docs-images/95/123092603/images/17-2.jpg "\"anisotropically reflected\" at the optical interface of acoustic energy propagation is collinear with the optical direction.")
17 AOTF Technology Quasi-Collinear Configuration [001] AOTF is Configured so that the direction Acoustic Phase-Velocity Group Velocity is parallel (collinear) with optical direction Sound is "anisotropically reflected" at the optical interface of acoustic energy propagation is collinear with the optical direction. This is not a true collinear interaction Aperture since the acoustic & optic phase-velocity Acoustic Group-Velocity Optical Input directions are not parallel, and the diffracted beam separates spatially from the 0-order Transducer RF power consumption is low as there is efficient acoustic/optical overlap Interaction-Length Resolution is narrow for longer interaction-lengths Acceptance angle is restricted; diffraction-limited optics required for narrow resolution. Inherently low side-lobes since natural apodisation due to acoustic attenuation Novel Optical Components Slide 17
18 Quasi-Collinear AOTF Realisation Narrow Resolution δλ / λ ~ 0 % Ultra-Narrow Resolution δλ / λ ~ 0 1% Novel Optical Components Slide 18
19 Next Generation QC-AOTF DRIVE POWER Ultra-Narrow QC-AOTF Drive Powwer - W Wavelength - µm Narrow resolution QC-AOTF Beam Diameter 5mm (diffraction-limited) Drive Power W Length 0mm Ultra-Narrow resolution QC-AOTF Beam Diameter 5mm (diffraction-limited) Drive Power W Length 40mm Novel Optical Components Slide 19
20 Next Generation QC-AOTF DRIVE POWER Ultra-Narrow QC-AOTF Next Gen QC-AOTF Drive Powwer - W Wavelength - µm Narrow resolution QC-AOTF Beam Diameter 5mm (diffraction-limited) Drive Power W Length 0mm Ultra-Narrow resolution QC-AOTF Beam Diameter 5mm (diffraction-limited) Drive Power W Length 40mm Next Generation QC-AOTF (Ultra-Narrow resolution) Beam Diameter 1 8mm (diffraction-limited) Drive Power 4W Length 0mm Novel Optical Components Slide 0
21 Thank you for your attention This research has been partially supported by the European Commission through the Framework Seven (FP7) project MINERVA We acknowledge the contributions of S Valle during his time at G&H Novel Optical Components Slide 1
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