Advertisement
Quick Links
Feb 2020
Acousto-Optic Modulator Driver
Including: Basic Modulator Alignment
for M1340 series
Instruction Manual
RFA2120 Series
Models -
RFA2120-x, (RFA2121-1-25)
RFA2120-L-x
(RFA2121-1-12)
Options -x:
- 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:
: 120MHz, > 25W output
: 120MHz, > 12W output
: 0-5V analog modulation range
: analog modulation only. No RF gate
: digital modulation only. No RF gate
: 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
isomet@isomet.com
isomet@isomet.co.uk
Advertisement
Related Manuals for ISOMET RFA2120 Series
Summary of Contents for ISOMET RFA2120 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 RFA2120 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 M1340 series. The driver accepts two independent digital and analogue modulating signals and provides a double- sideband amplitude modulated RF output to the acousto-optic modulator.
- Page 3 ISOMET This amplifier is designed to operate at full rated power into a 50Ω load with 100% duty cycle. Water cooling is mandatory. The heatsink temperature must not exceed 70°C. SERIOUS DAMAGE TO THE AMPLIFIER MAY RESULT IF THE TEMPERATURE EXCEEDS 70°C.
- Page 4 ISOMET CONTROL Two inputs directly control the RF output; Gate and Modulation. The Gate response time (tgm, Fig1) is approximately 200nsec The RF Modulation response time is < 50nsec The relationship between the driver control inputs, the RF waveform and AO response is shown below for analog modulation type.
- Page 5 ISOMET Gate (active high enables the RF amplifier) TTL compatible input Default condition is RF Off. A high level (1.7V < V < 5V) will gate the RF ON. A low level (0V < V < 0.8V), or not connected will gate the RF OFF.
-
Page 6: Led Indicators
ISOMET LED INDICATORS The front panel LEDs serve to indicate a number of possible operating states. The LEDs [C] and [D] illuminate when the DC power is applied and the Interlocks are valid. LED's Power Adj Pot [A] Shows GREEN when the RF output is live PROVIDED: •... -
Page 7: Installation And Adjustment
ISOMET INSTALLATION AND ADJUSTMENT Connect cooling water to the RFA2120 Connect cooling water to the AO device. Due to the high RF power dissipated in the AO modulator, it is paramount that the device is operated only when water cooling is circulating. - Page 8 ISOMET With an insulated alignment tool or screwdriver rotate the PWR ADJ potentiometer fully anti- clockwise (CCW) , then clockwise (CW) approx 1/4 turn. Apply DC to the amplifier. Apply a 10.0V constant signal to the Analog modulation input on the D-type connector.
-
Page 9: 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 10 ISOMET RFA 2120 Standard Version Connection Summary ‘D’ Type Control Connection Signal Type Pin out connection Digital Modulation / GATE Input Signal pin 6 TTL high (>1.7V) = ON Return pin 7 TTL low (<0.8V) or no connection = Off...
- Page 11 ISOMET RF Output Analog Mod'n nput 9-way male DC Supply Input D-type Screw terminals +24V 0V +Vdc GND PWR ADJ CTRL RF DRIVER ISO M ET MODEL : S/N : G 1/8" Thread Water Fittings Front placement : RFAXXX Rear placements : RFAXXX-R...
- Page 12 ISOMET RF Carrier Modulation Signal Input Amplitude Modulated RF Output Typical analog modulation RF waveforms are shown above. For the RFA2120 and similar drivers, the modulation input is a combination of analog and digital control as illustrated below. Peak Level...
- Page 13 ISOMET M1340 series Bragg Separation Angle Angle Zero Order (+1) Input Laser Beam (-2) First Order (-1) Diffracted Beam RFA2110 / RFA2120 Modulation Input (RF Gate Input) Coolant circuit not shown for clarity. Flow rate > 0.5 liter / min at less than 25deg C...
- Page 14 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...
Need help?
Do you have a question about the RFA2120 Series and is the answer not in the manual?
Questions and answers