background image

 

 

 

 

July 22 

 

 

 

 

 

 

 

 

 

Acousto-Optic Modulator Driver  

Including:  Basic Modulator Alignment  
 

 

  

 

 
Instruction Manual

 

RFA2x1 / RFA4x1 Series  

 

Models - 

 

RFA2x1-z  

 

 

 

 

 

RFA4x1-z (higher power) 

 

 

 

x = 4 :   

Fc = 40MHz 

 

 

x = 4 :   

Fc = 40MHz 

 

 

x = 5 :   

Fc = 50MHz 

 

 

x = 6 :   

Fc = 60MHz  

 

x = 7 :   

Fc = 70MHz 

 

x = 8 :   

Fc = 80MHz 

 

 

 

Options -z: 

 

 

- L 

 

: active low gate 

 

 

 

  (no connection = RF disabled)  

 

 

- V 

 

: 0-5V analog modulation range 

 

 

- A 

 

: analog modulation only. No gate signal  

 

 

- D 

 

: digital modulation only. No gate signal 

 

- R 

 

: coolant fittings on rear face

 

 

 

 

 

ISOMET CORP, 10342 Battleview Parkway, Manassas, VA 20109, USA. 

Tel: (703) 321 8301, Fax: (703) 321 8546, e-mail: 

[email protected]

 

www.ISOMET.com

 

ISOMET (UK) Ltd, 18 Llantarnam Park, Cwmbran, Torfaen, NP44 3AX, UK.  

Tel: +44 1633-872721, Fax: +44 1633 874678, e-mail: 

[email protected]

  

ISOMET

 

Summary of Contents for RFA2 1 Series

Page 1: ...ve low gate no connection RF disabled V 0 5V analog modulation range A analog modulation only No gate signal D digital modulation only No gate signal R coolant fittings on rear face ISOMET CORP 10342...

Page 2: ...ee running quartz crystal oscillator This frequency and stability are accurate to within 25ppm The oscillator is not temperature stabilized A high frequency diode ring modulator is used to amplitude m...

Page 3: ...28Vdc The output power level is set by the power adjust potentiometer PWR ADJ NOTE Maximum power fully clockwise 1 1 AO MODULATION OVERVIEW To intensity modulate a laser beam in an acousto optic modul...

Page 4: ...nate if a the internal driver thermal interlock switch is open over temperature fault b the AO thermal interlock switch is open over temperature fault c the AO thermal interlock is not connected to th...

Page 5: ...age 8 Connect pin 4 of D type to INT and pin 5 to INT The interlock connection becomes open circuit disabling the RF output if the temperature exceeds the trip point The trip point depends on the modu...

Page 6: ...D variants 3 10 Apply DC power to the driver Input the laser beam toward the centre of either aperture of the AOM Ensure the polarization is correct for the AO crystal type and the beam height does no...

Page 7: ...t ball of brushed short fibres removed cotton slightly moistened with clean alcohol Before the alcohol has had time to dry on the surface wipe again with dry cotton in a smooth continuous stroke Exami...

Page 8: ...upplied Description Model Variant Signal Type Signal Pin Return Pin Level Action GATE Standard 5V Logic Input 6 7 1 7V ON 0 8V or NC OFF Option L 5V Logic Input 6 7 0 8V ON 2 5V or NC OFF MODULATION S...

Page 9: ...CTRL ISO M ET RF DRIVER MODEL S N DC Supply Input Screw terminals Vdc GND G 1 8 Thread Water Fittings Front placement RFAXXX Rear placements RFAXXX R RF Output BNC 24Vdc to centre pin Note Unless sta...

Page 10: ...r Block Diagram Peak Level set by driver PWR ADJ potentiometer RFOutput Power Analog Input Range 0 10V 10V 0V 0W Digital Gate Input Set W tART tR tGRT tF tGFT Figure 3 Typical RF Output Waveforms Stan...

Page 11: ...ncy delay between a Gate High input and RF output fully enabled 200 ns NA NA tGFT Latency delay between a Gate Low input and RF output fully disabled 100 ns NA NA Table 1 Timing spec s Time Analog Mod...

Page 12: ...ro Order Input Laser Beam AOM RFA2x1 Separation Angle Coolant circuit not shown for clarity Flow rate 1 liter min at less than 20deg C DC supply 24Vdc 7A 2 1 3 AO Interlock Connector INT Pin view Norm...

Page 13: ...surface and in the plane of deflection is BRAGG fc 2 v The separation angle between the Zeroth order and the First order is SEP fc v Optical rise time for a Gaussian input beam is approximately tr 0 6...

Page 14: ...called the Pedestal delay Input Beam Location Vertical axis Place the laser beam at the centre of the active aperture at Y mm above the base Horizontal Diffraction axis Place beam above the Bragg pivo...

Page 15: ...the minimum RF pulse width Optical rise fall switching time For a Gaussian beam is approximately Tr 0 65 x Tt Total Sync Time This represents the total delay time between the electronic modulation si...

Reviews: