Acousto-Optic Devices Acousto-Optic Devices A piezoelectric element is bonded to an acousto-optic medium consisting of single crystal such as tellurium dioxide (TeO2) and lead molybdate (PbMoO4) or glass, and when an electrical signal is applied to this piezoelectric element to generate acoustic waves, which are propagated in the medium, a laser beam passing through the medium is diffracted (Acousto-Optic effect). This diffraction includes Bragg diffraction and anisotropic Bragg diffraction. Using the former is an acousto-optic light modulator, and using the latter is an acousto-optic light deflector and acoustooptic tunable flter. The acousto-optic light modulator can modulate laser beam intensity by means of amplitude modulation at a fixed frequency. The acousto-optic light deflector is capable of angle modulation (position modulation) and intensity modulation for laser beam by means of frequency modulation and amplitude modulation. The acousto-optic tunable filter can select diffracted light wavelength by means of frequency modulation and can modulate output intensity by means of amplitude modulation. Some specifications of AO devices can be optimized according to the needs/purpose of customers. Please contact us for further details. Safety Precautions (Common precautions for Acousto-Optic Devices) ◊ When using our products, no matter what sort of equipment they might be used for, be sure to make a written agreement on the specifications with us in advance. ◊ Do not use the products beyond the specifications described in this catalog. 1. Falling Shock As single crystal or glass is used as medium for acousto-optic devices, care shall be taken not to give a falling shock to prevent breakage of the devices. 2. Electrical Input (Driving Power) The electrical input power shall not exceed the specified maximum driving power to prevent breakage of the crystal. 3. Laser Input Beam Polarized light conditions of laser input beam differ in accordance with the input equipment types. Operate at the specified polarized light. Exercise caution as the light input of 1 W/mm2 or more can not be applied in some cases. 4. Dewing Dewing on optical surfaces of the medium causes stain, thus deteriorating the light transmittance. 5. Installation Use fixing screws and bragg adjusting rotating axis with the allowable depth of the fixing taps or the rotating center hole specifed in the product diagram or more. 6. Environmental Conditions The AODs shall not be operated and/or stored under following environmental conditions: a) To be exposed directly to water or salt water b) Under conditions of dew formation c) Under conditions of corrosive atmosphere such as hydrogen sulfied, sulfurous acid, chroline and ammonia. 7. Long Term Storage The AODs shall not be stored under severe conditions of high temperatures and high humidities. Store them indoors under 40 °C max. and 75 %RH max. with no dew formation. <Package markings> Package markings include the product number, quantity, and country of origin. In principle, the country of origin should be indicated in English. Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Definition of Terms Terms Definition Center Frequency: fo Driving frequency at light modulator and the center frequency of deflection bandwidth at light deflector. Modulation Bandwidth: Δ fi This is calculated via following equation using response (tr) Δ fi=0.35/tr Diffraction Efficiency Ratio of the first-order diffracted light intensity (I1) and the 0th diffraction intensity with no driving power (Transmitting light intensity) (I00) I1/I00 (%) Rise time at pulse modulation (10 to 90 %) With the pulse response of electric system (te) included, the total response time (ts) is ts=√ te2+tr2 (%) 90 Pulse Response: tr 10 tr Extinction Ratio Ratio of the maximum first-order diffracted light intensity and the optical intensity in the same direction with no driving power. Number of Resolvable Spots: N Ratio of the deflection angle Δ q=l Δ f/u and the extending angle of optical beamΔ qb=l/D D 1 1 Δq 1 = · Δf · = · Δf · t N= · u g g Δqb g l : Optical Wavelength D : Diameter of input laser beam Δ f : Defection Bandwidth g : Coefficient in accordance with optical beam shape u : Acoustic Velocity of medium t : Access Time Access Time: t Time for acoustic wave to pass optical beam t=D/u Deflection Bandwidth: Δ f Driving frequency range where first-order diffracted light intensity is half of the maximum value (–3 dB). Deflection Angle: Δ q Diffraction angle in accordance with deflection bandwidth Δ q=l Δ f/u Resolution Extention of filter light wavelength with the constant driving frequency at acousto-optic tunable filter. Dispersion of Deflection Angle Wavelength dispersion of diffracting direction(angle) in the range of optical wavelength at acousto-optic tunable filter. Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Application Examples (Light Modulator) Cleaning Laser Laser Charging Polygon Lens u Lens Photo Detector Transferring f·q Lens Lens Light Modulator Beam Splitter Sensitive Drum Flow Cell Slit mirror Light Modulator Fixing Lens High Freq. Signal Developing Signal Processor Laser Doppler Velocity Meter Laser Printer (Light Deflector) AOD AOD Laser Beam Laser Beam Diffracted Light Diffracted Light 0 th.Light Stopper 0 th.Light Stopper Amp Amp VCO VCO Input Signal Input Signal Laser Beam Random Access Scanner Laser Beam Sweep Scanner AOD Lens Image Sensor Laser Beam Computor 0 th.Light Stopper Amp Input Signal Mixer Local Oscillator Spectrum Analyzer (Acousto-Optic Tunable Filter) Color Original Drum Monochromatic Light Electrical Signal Acousto-Optic Tunable Filter EFL-F20 Photomultiplier Amp. Changing-Over Switch Memorized Standard Signal RF Amp. Differential Amp. White Light Source Sweep Oscillator Trigger Gate Circuit Color Analyzed Signal Schematic Diagram of a Color Analyzer System Using Acousto-Optic Tunable Filter Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Acousto-Optic Light Modulators Type: EFLM This acousto-optic light modulator, using an acoustooptic effect, can modulate various lasers ranging from visible light to infrared light. Features ● Low driving power (0.5 to 2.5 W) modulation bandwidth (DC to 40 MHz) ● Superior temperature characteristics (2q: 200 ppm/°C) ● RoHS compliant ● Wide Recommended Applications ● Laser printer Doppler measuring ● Various light recording ● Various light measuring ● Laser processing ● Q-switch for Fiber Laser ● Laser Principle Light Modulators Incident laser Medium beam Absorber 1st diffracted light q 2q 0st diffracted light Acoustic wave Transducer Oscillator Explanation of Part Numbers 1 2 3 4 E F L M Product Code 5 6 7 Center Frequency 8 9 10 Design No. Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Ratings and Characteristics Type EFLM ● Part No. Item EFLM200AL2G EFLM135Y01A AO Medium TeO2 Acoustic Velocity: u (m/s) 4260 EFLM120Y05B Optical Wavelength: l (nm) 440 to 770 1064 1550 Center Frequency: f (MHz) 200 135 120 Modulation Bandwidth: Δ f (MHz) (Beam Diameter (mm)) DC–28 min. (00.075) DC–4 min. (00.5) DC–4 min. (00.5) Maximum Diffraction Effciency (%) (Beam Diameter (mm)) 75 min. (00.075) 75 min. (00.5) 50 min. (00.5) Pulse Response (ns) (Beam Diameter (mm)) 12 max. (00.075) 80 min. (00.5) 80 min. (00.5) Maximum Beam Diameter (mm) 0.4 0.6 0.8 Maximum Driving Power (W) 1.0 1.2 2.0 90 min. ( l=400 to 500 nm) 85 min. ( l=551 to 700 nm) 92 min. 90 min. Optical Transmittance (%) Extinction Ratio 1000 : 1 min. Input Impedance (Ω) 50 (VSWR 1.5 max.) Linear (Vertical to the base: E Vector) Laser Polarization Dimensions in mm (not to scale) EFLM200AL2G Aperture f3 Connector(SMA) 30.4 8.1 21 15 9.0±0.1 Hight of aperture center 24.8 2.5 41.5 30 45 (53) f3 Depth4 2-f4 4 14.5 1 20.4 9.5 14 f3 Depth4 Connector(SMA) 32 14.0±0.1 13 9.5 28 7 10 30 18.5 10 2-M3(ISO) Depth4 23 15.5 Aperture f3 Connector(SMA) EFLM120Y05B 9.3 23.5 Aperture f3 EFLM135Y01A 25.0±0.1 10 4-M2.6(ISO) Depth4 unit : (mm) ■ Please contact the factory for packaging methods. Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Typical Characteristics (AO Modulators) Beam Diameter vs. Pulse Response Optical Transmittance l=488 nm 30 20 l=1064 nm 10 l=1550 nm 0 400 800 1200 1600 Optical Wavelength (nm) 2000 Pulse Response (ns) Static Optical Loss (%) 30 20 Beam Diameter vs. Diffraction Efficiency 200 MHz 10 90 Diffraction Efficiency (%) 0 100 200 Beam Diameter (µm) 80 70 Beam Diameter vs. Eccentricity of Diffracted Beam 1.0 0 50 100 Beam Diameter (µm) 150 200 0.5 0 100 200 300 400 500 600 Beam Diameter (µm) 1 M200 0.5 Pulse Response EFLM200 0 1 Angle of Incident Light q (deg) 2 q 2q Driving Power vs. Diffraction Efficiency Diffraction Efficiency(%) M200 Light Intensity(%) Effective Ratio of Incident Light(%) Angle of Incident Light vs. Effective Ratio of Incident Light Eccentricity 60 100 l=633nm 80 60 l=488 nm 10 40 0 20 0 100 90 Time(10ns/div.) 0 0.5 1.0 Driving Power (W) 1.5 Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Acousto-Optic Light Deflectors Type: EFLD Acousto-Optic Light Deflector deflects laser beam by using shear-mode acoustic waves travelling in a single crystal of tellurium dioxide (TeO2), whereby flat frequency response and light deflection characteristics of high diffraction efficiency are obtained with low driving power. Panasonic’s unique system is employed for this deflector, thus eliminating the need for an optic phase plate even for two dimensional deflection, and simplifying the optical system. Features ● Low driving power (0.5 to 1 W) density of resolvable spots (160 to 750 spots) ● High diffraction efficiency (over 80 %@633 nm) ● Wide deflection angle (over 2.7 °@633 nm) ● RoHS compliant ● High Recommended Applications ● Laser scanner microscope ● Electrical spectrum analyzer ● Laser Principle Light Deflectors TeO2 crystal Incident laser beam Absorber f2 f1 <110> } diffracted light 0 th diffracted light <001> Acoustic wave Transducer f1 to f2 Oscillator Explanation of Part Numbers 1 2 3 4 E F L D Product Code 5 6 7 Characteristics (Number of Resolvable Spots) 8 9 10 Design No. Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Ratings and Characteristics Part No. Item EFLD250 EFLD250A AO Medium EFLD250C EFLD250R TeO2 Optical Wavelength: l (nm) 633 488 to 515 442 to 458 760 to 840 250 min. 250 min. 250 min. 160 min. 5.3 5.4 5.4 4.5 3.5×3.5 3.5×3.5 3.5×3.5 3×3 Acoustic Velocity: u (m/s) 660 650 650 660 Center Frequency: f (MHz) 75 90 (l=515 nm) 100 (l=488 nm) 103 (l=458 nm) 108 (l=442 nm) 55 Deflection Bandwidth (–3 dB): Δ f (MHz) 50 min. 50 min. 50 min. 36 min. Maximum Diffraction Efficiency (%) 80 min. 80 min. 70 min. 75 min. Maximum Driving Power (W) 0.6 0.5 0.5 1.0 Deflection Angles: Δ q (deg.) 2.7 min. 2.2 min. 2.0 min. 2.5 min. Optical Transmittance (%) 94 min. 92 min. 90 min. 90 min. Number of Resolvable Spots (Spots) Access Time (μs) Maximum Beam Dimensions: H×W (mm) Input Impedance (Ω) 50 (nominal) Laser Polarization Linear (Horizontal to the base: E Vector) Part No. Item EFLD750 EFLD750A AO Medium Optical Wavelength: l (nm) Number of Resolvable Spots (Spots) Access Time (μs) EFLD750C EFLD750R TeO2 633 488 to 515 442 to 458 760 to 840 750 min. 750 min. 750 min. 540 min. 15.2 15.4 15.4 15.2 Maximum Beam Dimensions: H×W (mm) 3×10 Acoustic Velocity: u (m/s) 660 650 650 660 Center Frequency: f (MHz) 75 90 (l=515 nm) 100 (l=488 nm) 103 (l=458 nm) 108 (l=442 nm) 55 Deflection Bandwidth (–3 dB): Δ f (MHz) 50 min. 50 min. 50 min. 36 min. Maximum Diffraction Efficiency (%) 80 min. 80 min. 70 min. 75 min. Maximum Driving Power (W) 0.6 0.5 0.5 1.0 Deflection Angles: Δ q (deg.) 2.7 min. 2.2 min. 2.0 min. 2.5 min. Optical Transmittance (%) 94 min. 92 min. 90 min. 90 min. Input Impedance (Ω) Laser Polarization 50 (nominal) Linear (Horizontal to the base: E Vector) Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Dimensions in mm (not to scale) Type EFLD250 Type EFLD750 Aperture f6 30.4 Aperture 45 53 20.4 21 10.2 Base 32 15 Connector(SMA) 4-M2.6(ISO) Depth4 f3 Depth4 20.4 25.0±0.1 10 32 45 53 14.0±0.1 f3 Depth4 14.0±0.1 Base 21 10.2 5 30.4 connector(SMA) 4-M2.6(ISO) Depth4 25.0±0.1 10 ■ Please contact the factory for packaging methods. Diffraction Efficiency Type EFLD750 Diffraction Efficiency(%) Typical Characteristics 45 75 Frequency(MHz) 105 Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Acousto-Optic Tunable Filters Type: EFLF Acousto-Optic Tunable Filter uses an anisotropic diffraction of light occuring with shear-mode acoustic waves travelling in a single crystal of tellurium dioxide (TeO 2 ), which is a high speed spectral element selecting optical monochromatic light from multicolor at high speed. Features ● Low driving power (0.5 to 1.0 W) spectrum scanning (6 to 9 μs) ● Wide optical tuning range (380 to 750 nm) ● High spectrum resolution (0.4 to 2.3 nm) ● RoHS compliant ● Rapid Recommended Applications ● Rapid ● Color scan spectrum analyzer decomposition Principle Tunable Filters TeO2 crystal Absorber Incident light 2 1 1 3 2 Acoustic wave 3 Tuned light l1 Untuned light Tuned light l1+Dl f1 Oscillator Transducer Explanation of Part Numbers 1 2 3 4 E F L F Product Code 5 6 Characteristics (Resolution) 7 8 9 10 Design No. Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Ratings and Characteristics Part No. EFLF20 Item EFLF100L1 AO Medium EFLF100R1 EFLF100R2 TeO2 Optical Tuning Range:l (nm) 380 to 750 400 to 642 900 to 1600 1600 to 3000 Resolution for Slow Scan (nm) 0.4 to 2.3 1.4 to 6.3 4 to 12 12 to 41 Maximum Diffraction Efficiency (%) (Extraordinary Light or Ordinary Light) 80 min. Access Time (μs) (Beam Dimensions: mm) 70 min. 9 max. (3×5) 6 max. (3×4) Dispersion of Deflection Angle for Filtered Light (deg.) (Extraordinary Light) (mrad) 0.5 max. 0.3 max. Driving Frequency Range: f (MHz) 40 to 110 50 to 105 39 to 72 20.5 to 39 1.0 1.0 1.0 3.0 Maximum Drive Power (W) Input Impedance (Ω) 50 (nominal) Maximum Beam Dimensions (mm) (H×W) 3×5 3×4 Dimensions in mm (not to scale) Type EFLF Aperture 10.2 21 5 30.4 Base 11 32 45 53 f3 Depth4 14.0±0.1 connector(SMA) 4-M2.6(ISO) Depth4 20.4 25.0±0.1 Unit : (mm) 10 ■ Please contact the factory for packaging methods. Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Acousto-Optic Devices Typical Characteristics Frequency vs. Optical Wavelength 3000 650 780 EFLF20 Ordinary Light Extraordinary Light EFLF100R1,R2 EFLF100L1 600 2500 580 480 Optical Wavelength (nm) Optical Wavelength (nm) Optical Wavelength (nm) 680 550 500 2000 1500 450 1000 380 40 50 400 50 60 70 80 90 100 110 Frequency (MHz) 60 70 80 90 Frequency (MHz) 10 100 20 30 40 50 60 Frequency (MHz) 70 80 Resolution Resolution 5 Resolution(nm) Resolution (nm) EFLF20 0 380 480 580 680 780 8 7 6 5 4 3 2 1 0 EFLF100L1 400 450 500 550 600 650 Optical Wavelength(nm) Optical Wavelength (nm) 50 Resolution(nm) EFLF100R1,R2 0 1000 1500 2000 2500 3000 Optical Wavelength(nm) Spectra of a Mercury Lamp Observed by Rapid Specturm Scanning with EFLF20 690.9 579.2 546.2 577.1 491.7 436.0 434.9 408.0 404.8 Wavelength l (nm) Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014 Driving Units for AO Devices Signal Processors Type: EFLC This Signal Processor provides the required driving power to the Acousto-Optic Light Modulators (Type EFLM). Ratings and Characteristics Part No. EFLC200P25W Item Carrier Frequency (MHz) 200 Carrier Leak (dB) –30 max. Pulse Response Time (ns) 10 max. Input 0 to +2 V Output Power (W)(50 Ω load) 0.9±0.1 +24 VDC 700 mA max. Power Supply Modulation Pulse AM AM Dimensions in mm (not to scale) Type EFLC200P25W 75 26.6 89.0±0.5 OUTPUT +24V INPUT 100 2-f4.5 85 ■ Please contact the factory for packaging methods. Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use. Should a safety concern arise regarding this product, please be sure to contact us immediately. 00 Dec. 2014