• Synchronization to clock signals



Femtolock 2
Output Characteristics
Integrated Timing Jitter (1 Hz-1 MHz)2 <100 fs
RF Reference Input Requirements
Frequency Range (nth harmonic of the repetition rate)3 350 MHz-1.5 GHz
Input Level @ 50 Ohm 7 dBm
User Interface (W x D x H) 16.65 x 15.48 x 3.5 in (423 x 400 x 89 mm) (19 in 2U standard)
Actuator(L x W x H) 1.97 x 0.98 x 1.97 in (50 x 25 x 50 mm)
Detector Head(L x W x H) 1.97 x 0.79 x 1.18 in (50 x 20 x 30 mm)


  1. Due to our continuous improvement program, specifications are subject to change without notice.
  2. The jitter cannot be smaller than reference source. Specification applies to Element 2 and Synergy oscillators.
  3. For synchronization to RF frequencies >1.5 GHz, please contact Spectra-Physics.


Maximum Flexibility

Access to the loop filter settings allows the user to optimize the timing jitter and to adapt to different applications. Femtolock 2 enables synchronization of the laser’s repetition rate by locking on the fundamental input RF-frequency, on one of its higher harmonics or to easily switch between the two.  Femtolock 2 can be custom designed to meet your specific requirements in terms of frequency and configuration.

Maximum Stability

The system is based on a combination of fast piezo translator(s) (PZT) and a wide range translation stage. This arrangement allows the Femtolock 2 to compensate for fast fluctuations (kHz), as well as for slow or medium long term drifts (e.g. temperature drifts).  The unique configuration ensures resonance-free synchronization up to high frequencies and guarantees a long term drift-free operation.