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ISOMET RFA0110-1 Series Instruction Manual

Rf amplifier
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ISOMET
Oct 15
RF Amplifier
Including: Basic Modulator Alignment
D1345-aQ110-4
Instruction Manual
RFA0110-1-x Series
Models -
RFA0110-1
: 90-140MHz, amplifier module, 12W output
Options -x:
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

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Summary of Contents for ISOMET RFA0110-1 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 Isomet acousto-optic devices such as the D1345-aQ110. The driver requires low level RF signal from a suitable frequency source such as the Isomet iMS4-L frequency synthesizer. Figure 2 is a functional block diagram of the driver.

  • Page 3: Led Indicator

    ISOMET LED INDICATOR The front panel tri-colour LED indicates the operating state. LED Stack The top LED will illuminate RED when 24Vdc supply is applied. Normal condition is ON YELLOW The middle LED will illuminate YELLOW, when the RF Gate input is valid.

  • Page 4: Installation And Adjustment

    ISOMET INSTALLATION AND ADJUSTMENT Please refer to the Synthesizer manual for frequency, phase and amplitude control of the input signals. For water cooled AO devices; Connect cooling water at a flow of more than 1 litres/minute at < 20 deg.C to both the RF amplifier and AO device.
  • Page 5 ISOMET The optimum RF power level required for the modulator to produce maximum first 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.
  • Page 6 ISOMET 3.12 To equalise deflection efficiency at the extremes of the scan, alternate between the minimum and maximum desired frequencies and adjust Bragg angle to give the same efficiency for both. (Note: the photo detector or light power meter will require repositioning for the two angles.) .

  • Page 7: 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.
  • Page 8 ISOMET RFA 0110-2 Standard Version Connection Summary ‘D’ Type Control Connection Signal Type Pin out connection Digital Gate Input Signal pin 7 Return pin 2 CMOS high (12V logic) or NC = ON CMOS low (0.0v<V<1v) = OFF Coaxial SMA (2) Low level RF Input 90 –...
  • Page 9 ISOMET RF outputs (BNC) RF input DC Supply Input (SMA) Screw Terminals ISOMET ISOMET CTRL RF DRIVER MODEL : S/N : G1/8" Threaded Optional Water Fittings 8mm OD pipe Figure 1: Driver Installation...
  • Page 10 ISOMET +V dc Output Input +V dc Transistor -GATE (D-ty pe) Figure 2: Driver Block Diagram...
  • Page 11 ISOMET Beam Dump Bragg Angle at 355nm Separation Angle at 355nm 3.43 mrad (Nominal) 110MHz = 6.85 mrad "Knife edge" reflector D1345-aQ110 Separation Bragg Angle Angle Input Laser Beam Zero Order First Order Diffracted Beam Scan Angle Scan Angle at 355nm 105MHz -125MHz = 1.25 mrad...
  • Page 12 ISOMET Schematic of a single electrode 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 : ...