• 62-40 FOREST AVE, 2nd FLOOR, RIDGEWOOD, NY 11385 • TEL: (718) 456-6000 • FAX: (718) 456-6050 • www.EOPC.com
P.O. BOX 650441 FRESH MEADOWS, NY 11365
Modulators and Choppers Locked to an External Clock Signal


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optical modulators / choppers / shutters
tuning fork (fixed frequency) choppers
variable frequency choppers
choppers / shutters
rotating wheel (variable frequency) choppers

optical chopping / modulating systems
optical chopping systems locked to ext. clock
optical chopping systems locked in master/slave mode

optical SAFETY shutters
laser safety (interlock) shutters
X-Ray (interlock) shutters

optical shutters, choppers and filters
optical shutters / choppers
optical choppers / shutters
filter selectors

optical scanners and deflectors
resonant (fixed frequency) scanners
beam deflectors

optical scanning / deflecting systems
- optical scanners locked to an external clock signal
- optical scanning systems to generate
a circle or an ellipse or to lock optical scanners
in phase or out of phase

- optical scanning systems to generate
a Raster Scan or Lissajous Patterns

- X,Y raster scanning systems
- 2-axis deflectors

ED Driver
AGC Driver
PLD-1C Driver
PLD-1S Driver
PLD-2C Driver
PLD-2S Driver
PLD-2SXY Driver
PLD-XYG Driver
DCH-40 Driver
DCH-50 Driver
DCH-60 Driver
DSH-10 Driver
DSH-20 Driver
DSH-35 Driver
DSH-65 Driver

other products
Filter selectors
Rotating Wheel Optical Choppers
photo diode amplifiers
o/e and e/o converters
fiber optic multiplexers
fiber optic video links
laser vibrometers
Photodiode Transimpedance Amplifier
Analog / digital fiber links
Optical time domain reflectometers
Optical spectrum detectors
Tuneable laser sources
Variable optical attenuators
Loss test sets
Fiber optic power meters
Light sources
Visual fault locators
Video probes
Fiber identifiers

Data Sheets

contact us


 Frequency Range 
 ONE FIXED FREQUENCY from the range of 5 Hz to 20 kHz 
 External Clock Signal 
 Sine or TTL level square wave (1V PTP to 20V PTP) 
 External Clock Stability 
 ±10 PPM 
 External Clock Accuracy 
 25 PPM 
 Chopper's Amplitude Stability 
 0.01% or better 
 Reference Output 
 Sine and TTL level square wave 
 Phase Adjustment Range 
 ±45° minimum range 
 Phase Stability 
 Phase Relationship 
 Factory set to customer's spec. 
 Operating Temperature Range 
 0 - 60 °C 
 Power Input 
 110V ac or 220V ac, 50-60 Hz, 20W 

The PLD-1C driver phase locks any resonant chopper (type CH) to an external clock signal, to provide an ultra stable modulating optical beam motion [sub] system. The system can be used as a "stand alone" unit, in the laboratory, or can be incorporated into a larger instrument/system. The chopper is ONE FIXED FREQUENCY, picked from the range of 5 Hz to 20 kHz. The chopper is a small size, light weigh, low cost and long life device. It requires low power drive electronics and does not radiate electromagnetic interference (EMI). It has high frequency stability and high amplitude stability. The chopper is IR, VIS and UV and high vacuum capable. Reference signal and position output available.

The phase relationship to the clock is factory set to customer's requirements (0° to 360°), and is front panel adjustable in a range of ±45° minimum. The driver can be a fully integrated driver with front panels controls and internal power supplies or a printed circuit board level driver. The dimensions of the cased driver are: 12" × 10" × 3.8". The PLD-1C-PC driver is a printed circuit board level driver which requires an external ±15V DC power supply.

 Power switch to turn the drive "ON" 
 External clock input (TTL or sine wave), BNC connector 
 The chopper is phase locked to the clock signal 
 The chopper is self oscillating at its resonant frequency (the chopper is not locked to the clock) 
 To adjust the phase of the chopper in relationship to the clock, ±45° minimum 
 TTL level reference output, BNC connector 
 Sine wave reference output, BNC connector 
 Output connector to interconnect to the chopper 

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