AO Beam Deflectors

STG Series AO Deflectors

Acousto-optic beam deflectors (AOBD) offer precise angular control of an optical beam using RF drive frequency tuning. Up to two thousand spots can be resolved over an angular range of a few degrees for 1D and 2D scanning as well as beam deflection through a fixed angle. The scan speed can be as fast as a few microseconds.

Beam deflectors offer highly uniform diffraction efficiency across the full scan angle, with consistent power throughput for scanning applications such as material processing and digital imaging. We manufacture devices based on tellurium dioxide crystals grown in-house for visible and near-infrared (NIR) wavelength applications. For optimal transmission in the ultraviolet (UV) we offer fused silica and crystal quartz products. For broad bandwidth applications, we use a longitudinal mode approach with a phased array of piezoelectric elements within the transducer. We achieve high efficiency with slow shear deflection using parallel tangents off-axis interaction.

Typical applications include; photolithography, laser tweezers, optical scanning, optical inspection, digital imaging and PCB via hole drilling.

Please refer to the picture showing the deflection principle. At frequency f1; beam is deflected through angle θ1. At frequency f2; beam is deflected through angle θ2. Thus Scan angle range (Δθ), Δθ = θ1- θ2. Resolution (N) normally quoted as “number of resolvable spots” is equivalent to time-bandwidth product, N = Δf x T, where Δf – f1- f2; T – time for acoustic beam to traverse aperture.

2D scanning system is used for PCB via hole drilling and the configuration is shown as follows. Our recommendation is a package including 2pcs AODF4170 and stages, 1pc dual amplifier RF system.

Our standard AOBD model as below:

1. Specifications of AOBD 4170 (97-03255-02)

• AO Medium: Crystal Quartz

• Acoustic Mode: Longitudinal

• Acoustic Velocity: 5.744mm/μs

• Wavelength: 355nm

• Input Polarization: 90º to Mounting Plane

• Output Polarization: 90º to Mounting Plane

• Insertion Loss: 1%

• Center Frequency (Fc): 170 MHz

• RF Bandwidth: 80 MHz

• RF Power: 20W

• Active Aperture: 7mm x 20mm

• Min Diffraction Efficiency: 80%

• Peak Valley at 633 mm: 0.1

• VSWR: 2:1

• Scan Angle: 4.9 mrad

• Driver: dual-channel driver 97-0600X-XX for 2D scanning

NOTES;

• Delay/splitter box is included but not shown.

• 2 element phased array.

• input impedance 50 Ohms.

• Unit to be water cooled.

Applications: 2pcs AOBD4170 consist of a 2D scanning for PCB via hole drilling with a dual-channel RF driver (6000 series driver). We can provide full solution for the application. Please contact us for more information.

2. Specifications of AODF 4075 (97-02823-52)

• AO Medium: TeO2

• Acoustic Mode: Longitudinal

• Acoustic Velocity: 4.20 mm/μs

• Wavelength: 1066-1100 nm

• Input Polarization: Linear

• Output Polarization:

• Insertion Loss: <3%

• Center Frequency (Fc): 75 MHz

• RF Bandwidth: 32MHz, Goal 40MHz

• RF Power: 4W max.

• Active Aperture: 2.5 mm dia.

• Average Diffraction Efficiency: N/A

• Intensity Variation Across Bandwidth: N/A

• Min Diffraction Efficiency: 70%

• Peak Valley at 633 nm: N/A

• RMS at 633 nm: N/A

• VSWR: 2.0:1

• Scan Angle: N/A

• Time Bandwidth: N/A

Notes:

• Input Impedance is 50 Ohms.

• Electrode: Two Element Phased Array

• RoHS Compliant

STBR Series Beam Deflectors

STBR series Acousto-Optic Deflectors (AODs) combined with RF drivers are specially designed for high-speed scanning applications such as laser recording, optical scanning, signal processing, etc. The AOD changes the diffraction angle of an input laser beam and its angular position is linearly proportional to the RF frequency, so that the higher the frequency, the larger the diffracted angle.

KEY FEATURES

• 1-D and 2-D Deflection Systems

• Compact Integrated Design

• Wide Spectral Wavelength Range

• Uniform Scan Intensity

• Low Power Consumption

• Linear Polarization

• Fast Switching Speed

• High Resolution and Bandwidth

• High Throughput

• Custom Configurations Available

REAL-TIME APPLICATIONS

• Photolithography

• Continuous Laser Beam Deflection

• Vector (Random) Scanning

• Signal Processing

• Graphic and Laser Printing

• Optical Inspection

Acousto-optic beam deflectors (AOBD) offer precise angular control of an optical beam using RF drive frequency tuning. Up to two thousand spots can be resolved over an angular range of a few degrees for 1D and 2D scanning as well as beam deflection through a fixed angle. The scan speed can be as fast as a few microseconds. For mmore information on the RF drivers, please click here.

Multi-channel Modulators

Acousto-optic multi-channel modulators (AOMC) allow multiple beams to be modulated or deflected independently by integrating an array of transducers with a single acousto-optic crystal. Our proprietary optical and electrical designs minimize crosstalk, allowing concurrent operation of up to 48 channels for modulation, and up to 8 channels for beam deflection. Our AOMCs are known for their reliable operation and high performance.

Multi-channel modulators have parallel beams as input, each beam independently controlled by a different transducer to modulate its intensity. Multi-channel modulators are most often used for high speed applications like micromachining and direct-write lithography, as each beam can be modulated independently.

These devices can also be used to increase throughput when writing large media by writing multiple beams at the same time. Our multi-channel modulators equal the performance available with our single channel modulators, and can be customized for large aperture applications as well as high speed, small aperture applications.

A multi-channel beam deflector however, generates multiple diffracted beams from a single input beam at specific locations by simultaneously applying multiple frequencies to a single transducer. Each inpidual channel is a deflector that can either scan the beam or produce multiple spots. This makes it possible to create a two-dimensional grid. For example, if a four channel beam deflector were configured so that each channel diffracted three spots, the result would be a 4x3 grid.

High laser damage threshold is achieved using low-scatter materials. These are inspected to rigorous quality standards. We grow our own tellurium dioxide and source high quality fused silica and crystalline quartz to ensure low insertion loss and excellent optical power handling.

Our standard models are below:

Old Models of Acousto-optic Deflectors

An AO Deflector is a device that will scan an optical beam over a range of angles or accurately control the output angle of the beam. By altering the RF drive frequency to the Deflector, the deflection angle, i.e. the angle through which the diffracted beam is deviated, can be varied.

Effective AO Deflector design is complex, and involves choices of acousto-optic materials and the appropriate acoustic-mode depending upon the application. Commonly, resolution is the most important parameter for a deflector. However, high resolution generally comes at the expense of other parameters such as access time and efficiency. Thus it is important to effectively trade off the various performance requirements.

our strong team of scientists and engineers are available to assist you in selecting one of our standard products or providing a custom solution.

Typical applications include; Photolithography, laser tweezers, optical scanning, optical inspection and digital imaging.

Drivers for the Standard AO Deflection Systems / 1D and 2 D

Select the driver, which corresponds to the required frequency and RF drive power for the AO Deflector or Bragg Cell selected. Then select the method of control: VCO (Voltage Controlled Oscillator) or DFS (Digital frequency Synthesizer) and the type of package (Rack Mount System Box or OEM Module). The system box typically requires power of 100 to 240 Volts, 47 to 63 Hz AC. The OEM module requires you to supply DC power, + 15 Volts, and -5 Volts typically, at the required current to power the unit.

The new 64040-150-0.8ADSDFS-8X1 is an eight channel, frequency synthesized driver with the signals combined as one output for use with an Acousto-Optic Beam Deflector (AOBD). The Driver allows independent analog and digital (blanking) control of up to eight beams of light. The frequency and power for each channel can be selected from presets stored in internal memory or setup through the top panel keypad, the RS-232, or the USB. Internal memory contains a factory default setup and up to 16 user stored configurations.

45035-3-6.5DEG-1.06

45035-3-6.5DEG-1.06-XY

45035-5-6.5DEG-1.06

45035-5-6.5DEG-1.06-XY

45050-5-6.5DEG-.8

45050-5-6.5DEG-.8-XY

45050-6-.83

45070-5-6.5DEG-.63

45070-5-6.5DEG-.63-XY

45070-6

45100-5-6.5DEG-.51

45100-5-6.5DEG-.51-XY

45100-6

45125-2/10-.355

46080-1/4-LTD

46080-1-1.06-LTD

46080-1-.85-LTD

46080-1-LTD

46080-2-1.06-LTD

46080-2-.85-LTD

46080-2-LTD

46080-3-1.06-LTD

46080-3-.85-LTD

46080-3-LTD

46110-1-LTD

46300-0.2/2-.36

451000-GaP

451000L

451500G

D040-2G-BG2

D075-2EF-KW1

AO DeflectorD225-1B-OI1

A high performance AO Deflector operating at 488nm, manufactured with superior flatness and parallelism of optical faces to yield minimal wavefront distortion. A scan angle of 20mrad with 1160 spots resolution (Rayleigh criteria) and 7.7μs access time make this device ideally suited for high resolution imaging and reprographic applications.