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Laser synchronization controller

The repetition rate of a mode-locked laser is dependent on the cavity length. Synchronizing a modelocked laser to an external source means stabilizing the cavity length. This is usually done with a piezo. This piezo covers he whole audible range of frequencies. Additionally, the temperature drift has to be compensated. This may be achieved with a servo or with a picomotor. The featured controller is able to handle either of them.

the sync pcb mounted on a chassis side

Specifications

frequencies in the range of 50 .. 200 MHz, custom made in frequncy bands
50 .. 100MHz, 80 .. 150MHz, 120 .. 200MHz, 150 .. 250MHz, ... , upon request
subharmonic locking on request
external photodiode input signal 6..30mVpp into 50 Ohms, other levels on request, bias voltage +15V or -15V selectable
reference input signal -3 .. 3dBm, ultra low phase noise, eg HP 8662, HP 8663
low voltage piezo output 0..150 V (according to supply), thermally protected amplifier, selectable lowpass filter
locking range is a few 10kHz with a servo
achievable jitter <= 1ps rms, soliton pulses may achieve even lower values
RS485 & RS232 communication to the PC
comprehensive Windows GUI
supports a pushbutton and a LED for standalone operation
required supply voltages : +5V, +-15V, 120 .. 150V
pcb size is approx 254mm x 79mm
not RoHS compliant, but currently exempt

Its price is 6639 CHFr @ 1

approx 4282 Euro (@ 1CHFr = 0.645 Euro)
approx 5112 USD (@ 1CHFr = 0.770 USD)

The 350MHz sync prototype

A prototype of a synchronization controller running at 350MHz was successfully shipped. The measured jitter on a soliton system was well below 500fs even without an air-table.
Shown is the RF part at an intermediate assembly stage.

the prototype of the RF part of the 350MHz Sync

the prototype of the RF part of the 350MHz Sync

some target specs :
laser input level : -40..-20dBm
reference input level : -10..+10dBm

Production depends on the request.
The applied technology is assumed to be useable well beyond 500MHz.

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last update: 26.may.06 or perhaps later

Copyright (99,2006) Ing.Büro R.Tschaggelar