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Feb 2017
Acousto-Optic Deflector Driver
Including: Basic Deflector Alignment
Instruction Manual
RFA920T Series
Models -
RFA920T-80
RFA920T-110
RFA920T-150
Tel: +44 1633-872721, Fax: +44 1633 874678, e-mail:
: 60-100MHz 10V Tuning Input, 10V Analog Modulation Input
: 90-130MHz 10V Tuning Input, 10V Analog Modulation Input
: 125-175MHz 10V Tuning Input, 10V Analog Modulation Input
ISOMET CORP, 5263 Port Royal Rd, Springfield, VA 22151, USA.
Tel: (703) 321 8301, Fax: (703) 321 8546, e-mail:
ISOMET (UK) Ltd, 18 Llantarnam Park, Cwmbran, Torfaen, NP44 3AX, UK.
ISOMET
isomet@isomet.com
www.ISOMET.com
isomet@isomet.co.uk
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Summary of Contents for ISOMET RFA920T Series
- Page 1 ISOMET CORP, 5263 Port Royal Rd, Springfield, VA 22151, USA. Tel: (703) 321 8301, Fax: (703) 321 8546, e-mail: isomet@isomet.com www.ISOMET.com ISOMET (UK) Ltd, 18 Llantarnam Park, Cwmbran, Torfaen, NP44 3AX, UK. Tel: +44 1633-872721, Fax: +44 1633 874678, e-mail: isomet@isomet.co.uk...
- Page 2 The RFA920T combined Driver and Power Amplifier, Figure 1, is a modular, swept-frequency RF power source specifically designed to operate with Isomet acousto-optic deflectors. The driver accepts a tuning voltage between approximately +0 volts and +10 volts and provides an RF output to at the selected frequency.
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Page 3: Led Indicators
ISOMET The amplitude-modulated RF signal is input to a Class A power amplifier stage. This amplifier is designed to operate at full rated power into a 50 load with 100% duty cycle. Ensure adequate air flow across the heatsink. The heatsink temperature must not exceed 70C. -
Page 4: Installation And Adjustment
ISOMET INSTALLATION AND ADJUSTMENT (See Figures 4 & 5) With no d-c power applied, connect the + 24Vdc in to the center terminal of the feed-thru terminal 1. DO NOT APPLY POWER. Connect the RF output SMA jack to the SMA or BNC RF input of the acousto-optic deflector (or a 50... - Page 5 ISOMET The optimum RF power level required for the modulator to produce maximum first order intensity ( or minimum zero order intensity) will be different at various laser wavelengths. Applying RF power in excess of this optimum level will cause a decrease in first order intensity (a false indication of insufficient RF power ) and makes accurate Bragg alignment difficult.
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Page 6: Maintenance
ISOMET MAINTENANCE Cleaning It is of utmost importance that the optical apertures of the deflector optical head be kept clean and free of contamination. When the device is not in use, the apertures may be protected by a covering of masking tape. When in use, frequently clean the apertures with a pressurized jet of filtered, dry air. - Page 7 ISOMET Optional FAN and COVER 9way D-type Female RF Out Freq Start Adj +Vdc ISOMET RF DRIVER MODEL : S/N : CONTROL RF Pwr Adj 9 pin ‘D’ type Control signals Tuning Voltage (0 -10V) +sig pn1, -rtn pn6 Amplitude Control (0 – 10V)
- Page 8 ISOMET +Vdc Output Pre-Amp PWR ADJ PA Transistor Tuning Offset Analog Mod Interlock sw TO-220 Figure 2a: Driver block diagram (generic) FREQ TUNING (0.0 - 10.V, ~1Kohm) GATE (Optional) No Connect or Open Drain MOD / Amplitude Control (0.0 - 10.V, ~600ohm)
- Page 9 ISOMET RF Carrier Modulation Signal Input Amplitude Modulated RF Output Figure 3: Typical Modulation Waveforms...
- Page 10 ISOMET Schematic of a basic acousto optic deflector and tunable driver Intensity Modulation Tuning Voltage Deflector Driver Input Laser Beam BRAGG SCAN 1st Order Scan AO Deflector 0th Order The input Bragg angle, relative to a normal to the optical surface and in the plane of deflection is ...
- Page 11 ISOMET If applicable, Coolant circuit not shown for clarity. Separation Angle Zero Order Input Laser Beam Scanning First Order +Vdc Diffracted Beam Tune: 0 - 10V Analog Mod: 0 - 10V Gate: O/C Interlock Connector SMB Coax 3-pin Snap Normally Closed Contacts : Pins 1 , 2...
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