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July 22
Acousto-Optic Modulator Driver
Including: Basic Modulator Alignment
Instruction Manual
RFA2x1 / RFA4x1 Series
Models -
RFA2x1-z
x = 4 :
x = 5 :
x = 6 :
x = 7 :
x = 8 :
Options -z:
- L
- V
- A
- D
- R
ISOMET (UK) Ltd, 18 Llantarnam Park, Cwmbran, Torfaen, NP44 3AX, UK.
Tel: +44 1633-872721, Fax: +44 1633 874678, e-mail:
Fc = 40MHz
Fc = 50MHz
Fc = 60MHz
Fc = 70MHz
Fc = 80MHz
: active low gate
(no connection = RF disabled)
: 0-5V analog modulation range
: analog modulation only. No gate signal
: digital modulation only. No gate signal
: coolant fittings on rear face
ISOMET CORP, 10342 Battleview Parkway, Manassas, VA 20109, USA.
Tel: (703) 321 8301, Fax: (703) 321 8546, e-mail:
www.ISOMET.com
ISOMET
RFA4x1-z (higher power)
x = 4 :
isomet@isomet.com
isomet@isomet.co.uk
Fc = 40MHz
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Related Manuals for ISOMET RFA2 1 Series
Summary of Contents for ISOMET RFA2 1 Series
- Page 1 ISOMET CORP, 10342 Battleview Parkway, Manassas, VA 20109, 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 RFA2x1 is a combined Analog Driver and Power Amplifier is a fixed frequency RF power source specifically designed to operate with Isomet acousto-optic devices such as the M1208, M1346 and M1396. The driver accepts two independent modulating signals and provides a double-sideband amplitude modulated RF output to the acousto-optic modulator.
- Page 3 ISOMET Water cooling is mandatory. The case temperature must not exceed 50°C. SERIOUS DAMAGE TO THE AMPLIFIER MAY RESULT IF THE TEMPERATURE EXCEEDS 70°C. SERIOUS DAMAGE TO THE AMPLIFIER MAY ALSO RESULT IF THE RF OUTPUT CONNECTOR IS OPERATED OPEN-CIRCUITED OR SHORT-CIRCUITED.
-
Page 4: Led Indicators
The hysteresis of the thermal switches is 7-10deg C. Once in a fault state, the coolant temperature may need to be reduced below the normal operating point to reset the thermal switches. See AN1710 Resetting the AO Thermal Interlock (https://isomet.com/appnotes.html) -
Page 5: Installation And Adjustment
ISOMET INSTALLATION AND ADJUSTMENT Connect cooling water to the driver AND the AO device (e.g. M1208, M1396, M1346). Use of a corrosion inhibitor is strongly advised. Due to the high RF power dissipated in the AO modulators, it is paramount that the device is operated only when water cooling is circulating. - Page 6 ISOMET Locate the PWR ADJ access on the driver end plate. With an insulated alignment tool or screwdriver rotate the PWR ADJ potentiometer fully anti- clockwise (CCW), then clockwise (CW) approx’ 1/4 turn. Connect pin 8 of the D-type to the modulation signal source and pin 9 to the (0V) return.
-
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 Connection Summary: 9-way D-type Description Signal Return Variant Signal Type Level Action Model >1.7V Standard 5V Logic Input <0.8V or NC GATE <0.8V Option -L 5V Logic Input >2.5V or NC Analog, Standard Input Fully ON proportional Analog, Option -A...
- Page 9 ISOMET Note: Unless stated, both Digital GATE and Analog Modulation signals need to be applied. The interlock signal must be connected. Contacts closed for normal operation. Legacy design, DC supply connection +24Vdc to centre pin RF Output Analog Mod'n nput...
- Page 10 ISOMET +Vdc +Vdc Oscillator Mixer Output Pre-Amp PA Transistor Modulation Input Digital (Gate) Input Figure 2: Driver Block Diagram Peak Level set by driver PWR ADJ potentiometer Set W RFOutput Power Analog Input Range = 0 - 10V Digital Gate Input...
- Page 11 ISOMET Variant Description Standard RF rise time resulting from large signal <250 ns <250 ns <250 ns modulation. RF fall time resulting from large signal <50 ns <50 ns <50 ns modulation. Latency delay between a change in modulation level (A-Mod or D-mod) and RF...
- Page 12 ISOMET Bragg Separation Angle Angle Zero Order (+1) Input Laser Beam (-2) First Order (-1) Diffracted Beam RFA2x1 Modulation Input RF Gate Input Coolant circuit not shown for clarity. Flow rate > 1 liter / min at less than 20deg C...
- Page 13 ISOMET Basic AO Modulator Parameters Intensity Modulation Driver Input Laser Beam θ BRAGG θ 1st Order Deflected Beam 0th Order The input Bragg angle, relative to a normal to the optical surface and in the plane of deflection is: θ...
- Page 14 ISOMET Appendix A: Beam Position Timing Considerations for AO Devices in Pulsed Lasers Applications When attempting to synchronize a pulsed laser beam with a pulsed RF acoustic wave in an AO device, the designer must consider the transit time of the acoustic wave from the transducer to the laser beam position.
- Page 15 ISOMET Pedestal delay The time taken for the acoustic wavefront to reach the laser beam centre RF Driver input modulation signal RF Signal at AO Tp = beam position from transducer (X) transducer acoustic velocity (V) Acoustic Signal at laser beam...
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