Acousto-Optic Q-switch Driver (RF Driver)

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1. QSD Series RF Driver

  

A high power RF driver module is available in output powers of 50W, 75W or 100W. Powered from 220VAC or 110VAC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is automatically implemented.

  

Main Specifications: 

• RF power output : 50W, 75W or 100W

• Frequency: 27.125MHz

• VSWR: &#;1.2

• Modulation repetition rate: 800Hz-50kHz

• First pulse suppression

• Modulation control inputs: digital TTL , till 100kHz

• Driver over-heat, Q-Switch over-heat

• Internal over-temperature protection and over-current protection

• Digital display of frequency

• Supply voltage input: 220VAC/110VAC, <150W

Model Numbers: QSDxxyyA

QSD � QSD series RF driver

XX � RF frequency, 27-27MHz, 24-24MHz

YY � RF output power (W), 50-50W, 75-75W

A � Classification G, Z, T

Example QSD- (50W), QSD- (75W) or QSD- (100W)

 

Main Features of QSDxxyyT Series Digital Q-switch Driver:

Newly designed digital RF driver has the following features comparing with analog version:

l         Touch panel,

l         Digital circuit to improve control accuracy with frequency resolution of 0.01Hz (0.001Hz or less upon request)

l         Internal trigger synchronizing with laser, to achieve perfect marking

l         Integrated open load protection

l         Easier and more accurate panel controlled laser delay.

 

2

. R390 Series RF Driver

(high power)

R

390xx-yyDMzzz-A (50W, 100W)

A compact high power RF driver module is available in output powers of 50 or 100W. Powered from 28VDC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is implemented through either analogue modulation, RF off analogue control, triggered first pulse suppression, or triggered pre-pulse kill, as described in our FPS guidance notes . On board LED�s and TTL logic outputs monitor driver status and cooling is through forced air over the heat sink.

  

RF Power Output (yy)

50 or 100W

Frequency (xx=24, 27, 41)

24.00MHz, 27.12MHz or 40.68MHz (50W)

First Pulse Suppression

Triggered First Pulse Suppression: FPS

(zzz=FPS, PPK, R05, A05, A13)

Triggered Pre-Pulse Kill: PPK

 

RF Off Analogue Control: 0-5V R05

 

Analogue Modulation: 0-5V A05 / 2-13V A13

Frequency Tolerance

� 0.02%

Output Impedance

50W

RF Fall-Time

< 100ns (60ns typical)

RF Rise-Time

250ns typical

Extinction Ratio

> 52dB

Harmonic Levels

< -30dB at full power

Supply Voltage Input

28VDC �5%

Supply Current Input

6.5A (50W), 9.0A (100W)

Modulation Control Inputs

Digital TTL (TTL high = RF off)

Modulation Repetition Rate

100Hz to 100kHz

Internal Pulse Width

1�s to 14�s, typical

Status Monitoring

Power supply on, High VSWR

 

RF power low, RF power maximum

 

Driver over-heat, Q-Switch over-heat

Housing

Module

Storage Temperature

-20�C to +85�C

Operating Temperature

+10�C to +55�C

Dimension

220 x 160 x 105mm

Weight

1.5KG

 

3. R390 Series Q-switch Drivers (low power, high speed, compact Q-switch Driver, 2-24W)

R390xx-yyDMzzz-SC

 

The R390XX-YYDMZZZ-SC is a low to medium power radio frequency generator in a compact, OEM package. The driver supplies an RF signal to an acousto-optic Q-Switch, typically in an Nd:YAG laser. The Q-Switch, when excited, deflects a large portion of the laser light off the optical axis of the laser cavity spoiling the gain in the cavity and allowing the energy to be stored in the upper state of the gain media. When the RF is turned off, typically in 50ns, the Q-Switch becomes transparent and a light pulse is output from the laser.

 

The RF driver has two digital modulation inputs: Fixed and Variable. These controls allow the customer to issue a pulse command of a "Fixed" pulse width, the duration determined by the driver pulse width control, settable by the customer, or issue a "Variable" pulse command, the duration determined by the input signal pulse width. The RF driver may be modulated in "Fixed" duration mode at any frequency from 1 Hz to 500 kHz by an external frequency source. In "Variable" duration mode, the RF driver can be modulated from DC to 500 kHz. The RF energy can be modulated off in a short period of time (50 ns typical). The RF Driver can produce up to 24 watts output into a 50 ohm load. The R390XX-YYDSZZZ-SC driver is factory configured for RF Frequency, Power, and Control Options when ordered. The R in the model number indicates that this product is compliant with the EU Directive /95/EC for Reduction of Hazardous Substance.

 

Output RF frequency options: XX = 24, 27, 41

RF frequency = 24.00 MHz, 27.12 MHz, or 40.68 MHz

RF power: YY = 2 - - - 24

2 to 24 watts

Factory set to match the matching Q-Switch

Adjustable but limited to no more than 10 % above rating.

The 390XX-YYDMZZZ-SC driver is factory set when ordered with a control option, which determine the type of control of the output power. The options available that control the RF output level for the drivers include:

Control Option: ZZZ

FPS = First Pulse Suppression

PPK = Pre Pulse Kill

R05 = RF off Analog Control

A05 = Analog Control

The option available for the driver is factory set, and is specified by the last three letters of the model number. When the FPS or PPK control option is selected, the circuit is designed to eliminate the large light pulse that is output from the laser after a long period of inactivity. Normally, the first pulse from a Q-Switched laser that has been held off for over 100 ms will be much larger than the subsequent pulse. This excess energy can cause unwanted damage to the target of the laser. The circuit does this by scaling the energy sent to the Q-Switch. The result is that this first pulse has the lower energy compared to the subsequent pulses. When the A05 or R05 control option is selected, the circuit is designed to control the output with an analog input signal allowing intensity control of any pulse. This control is used to vary the output energy of the laser pulse.

 

A compact high power RF driver module is available in output powers of 50 or 100W. Powered from 28VDC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is implemented through either analogue modulation, RF off analogue control, triggered first pulse suppression, or triggered pre-pulse kill, as described in our FPS guidance notes. On board LED�s and TTL logic outputs monitor driver status and cooling is through forced air over the heat sink.

 

Parameter

Specification

Output Frequency:

XX = 24, 27, or 41, Where RF Frequency = 24.00, 27.12, 40.68 MHz � 0.01%

Spurious Levels:

-50 dBc Maximum

Harmonic Distortion

-20 dB Maximum

For more information, please visit Acousto-Optic Q-Switch Driver.

Additional reading:
The Ultimate Buyer's Guide for Purchasing Single-platform Fiber ...

Modulation Input

 

Mod In Fixed (pin 3 )

TTL Levels Triggered on TTL Rising Edge. Pulse Width Applied >50 ns.

Mod In Variable (pin 5)

TTL Levels TTL HIGH = RF Off

Extinction Ratio:

40 dB Minimum

RF Rise Time 10% to 90%

100 ns Maximum

RF Fall Time: 90% to 10%

50 ns Maximum

Modulation Repetition Rates:

1 Hz to 500 kHz for Fixed Modulation

DC to 500 kHz for Variable Modulation

Fixed Modulation Output Pulse Width Adjustment Range:

1 to 20 μs, Customer Adjustable

Available Pulse Suppression Modes:

ZZZ = Mode

Modulation Operating Mode is "Factory Set" Internally.

FPS = First Pulse Suppression

PPK = Pre Pulse Kill

R05 = RF Switched to Analog Control

A05 = Analog Control

FPS Trigger (pin 2) for Pulse Suppression for Units Configured with FPS, PPK:

TTL Levels, Triggered on TTL Rising Edge

Analog in (pin 6) for Power Control

for Units Configured with A05, R05

0 to 5 volts Analog

Enable - Stand by Mode (pin 11)

< 3 watt dissipation in stand by mode.

TTL High or no connection = Normal operation

TTL Low = Stand by Mode

Momentary TTL Low = Driver Reset - after fault is removed.

Zero Crossing Enable (pin 7) normally:

TTL high or no connection- disabled, TTL low- enabled

If model # is (-ZC):

TTL high or no connection- enabled, TTL low- disabled

Sync out (pin 1 )

Outputs 3.3 volt signal

RF Power Output:

YY watts where YY = 2 to 24 watts

Output Impedance:

50 Ω

Supply Voltage:

+15 VDC

Supply Current:

< 3 amps.  

OPERATING TEMPERATURE:

+10 to +55 0C Case Temperature

Contact Cooled

The Driver must be attached to a heatsink capable of dissipating 25 watts

MAXIMUM RATINGS:

 

Supply Voltage:

+18 volts

Power Output:

No DC Feedback Allowed

Storage Temperature:

-20 to + 850C

Dimension 90x60x25mm  

4. R390 Series Q-switch Drivers (low power, compact Q-switch Driver, 2-24W)

R390xx-yyDMzzz

 

A low power version of the standard R390 series ideal for use with our extensive range of miniature Q-Switches for compact DPSS lasers.

 

Powered from 24VDC, the modulation inputs allow either full digital control or activation of an internal pulse generator. First pulse suppression is implemented through either analogue modulation, RF off analogue control, triggered first pulse suppression, or triggered pre-pulse kill, as described in our FPS guidance notes. 

 

TTL logic outputs monitor driver status and cooling is through forced air over the heat sink.

RF Power Output (yy)

2 to 24W

Frequency (xx=24, 27, 41, 80)

24.00MHz, 27.12MHz, 40.68MHz or 80MHz

First Pulse Suppression

(zzz=FPS, PPK, R05, A05, A13)

FPS: Triggered First Pulse Suppression

PPK: Triggered Pre-Pulse Kill

R05: RF Off Analogue Control: 0-5V

A05: Analogue Modulation: 0-5V

Frequency Tolerance

� 0.02%

Output Impedance

50Ω

RF Fall-Time

< 50ns

RF Rise-Time

500ns max

Extinction Ratio

> 30dB

Harmonic Levels

< -30dB at full power

Supply Voltage Input

24VDC �5%

Supply Current Input

<2.5A

Modulation Control Inputs

Digital TTL (TTL high = RF off)

Modulation Repetition Rate

100Hz to 100kHz

Internal Pulse Width

1μs to 20μs

Status Monitoring

High VSWR, RF power low, RF power maximum

Housing

Module

Storage Temperature

-20�C to +85�C

Operating Temperature

+10�C to +55�C

Air Flow through Heat-Sink

>17 litres / second @ 25�C

Dimension

148x100x55mm

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