SLICE-OPL Offset Phase Lock Servo

SLICE-OPL is a single-channel offset phase lock servo that phase locks from 10 MHz to 9.3 GHz.

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The SLICE-OPL Offset Phase Lock Servo (OPLS) is designed to precisely control and quickly adjust the frequency detuning between a master and a follower laser. The SLICE-OPL forms a complete offset lock system when combined with the D2-250 Heterodyne Module and D2-260 Beat Note Detector. The D2-250 overlaps the free-space master & follower lasers to generate the optical beat note. It then launches the beat note into a fiber for delivery to the D2-260 where it is down-converted to the RF and then delivered to the SLICE-OPL for processing.

The SLICE-OPL is also designed for stabilizing frequency combs. With the ability to process beat notes as small as 10 MHz, the SLICE-OPL will tightly lock ƒCEO and ƒopt or ƒrep of the FFC-100 series of frequency combs as well as 3rd-party combs. The SLICE-OPL has a built-in touchscreen GUO with the ability to display and manipulate the error signal and engage the lock. No oscilloscope is required to initiate and monitor the lock.


  • Offset Phase Locks from 10 MHz to 9.3 GHz

  • Touch screen GUI

  • No oscilloscope is required to operate!

  • Precisely control follower laser frequency while remaining referenced to the primary standard

  • Tightly lock ƒCEO and ƒopt or ƒrep for frequency comb stabilization

  • User-adjustable servo parameters

  • Internal ramp generator

  • Fast frequency jumps with feed-forward

  • Offset frequency stability determined by reference stability

SLICE-OPL & SLICE-DOPL Specifications

Parameter Value
Number of Channels SLICE-OPL: 1 , SLICE-DOPL: 2
 Offset Range 10 MHz - 9.3 GHz
Loop Filter Transfer Function PID
Operation Modes Standby, Sweep, Proportional, PI, PID, LFGL, Integrator Hold
Loop Bandwidth >8 MHz
Internal Reference DDS with software settable frequency
External Reference Input Yes
External Reference Input Range to cover offset range (via beat note dividers) 10 - 300 MHz
Proportional Gain1 -30 dB to +40 dB
Prop Gain Resolution ≤0.5 dB
PI Corner Values (Hz) 100, 200, 500, 1k, 2k, 5k, ..., 1M, 2M, 5M
PD Corner Values (Hz) 150, 300, 600, ..., 1.5M, 3M, 6M
Low-Frequency Gain Limit Yes
LFGL Range Gprop + 20 to 80 dB
Integrator Hold Yes
Internal Digital Ramp Range ±10 V
Internal Digital Ramp Resolution 1/200 of Range
Internal Digital Ramp Rate 0.1 to 10 Hz

Internal Digital Ramp Output Port

Main Servo Out or Slow Servo Out
Output Voltage Clamp Software Settable
Clamping Resolution ≤100 mV
Output Impedance 50 Ω
Output Current Max ±30 mA
Slow Servo Out Yes
SSO Transfer Function Pure Integrator
SSO Modes Enabled/Disabled
SSO Lock Point User Settable
Power Input 100-230 VAC, 50-60 Hz

1 May be smaller by 10-20 dB