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On the Synchronization of lasers for FEL facility M.Danailov

On the Synchronization of lasers for FEL facility M.Danailov. Electronic versus direct optical locking Direct optical locking in master-slave configuration : based on injection of optical signal into the slave laser cavity and cross-phase modualtion Advantages: - passive, i.e. simple

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On the Synchronization of lasers for FEL facility M.Danailov

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  1. On the Synchronization of lasers for FEL facilityM.Danailov • Electronic versus direct optical locking • Direct optical locking in master-slave configuration : based on injection of optical signal into the slave laser cavity and cross-phase modualtion • Advantages: - passive, i.e. simple • - self-sustaining in the locking range (few KHz demonstarted) • - low jitter (below 10 fs?) • Disadvantages: - need of temperature stabilization or slow active feedaback to compensate long term drift • - might be sensitive to laser parameter changes with time • Active phase locking using PLL • PLL based on error signal from RF mixer/ phase detector of electrical signal • PLL based on error signal from a crosscorrelator

  2. On the Synchronization of lasers for FEL facilityM.Danailov PLL based on error signal from acrosscorrelator Advantages: - high sensitivity(sub-fs jitter demonstrated, i.e T.R. Schibli et al., Opt. Lett. 28, 947 (2003) ) - can work with pulses of very different (multiple) repetition rates i.e. 500 MHz clock can be combined with 50 Hz pulses Disadvantages: - working range narrow (limited by the puise duration) - may require higher power of the optical clock

  3. On the Synchronization of lasers for FEL facilityM.Danailov local fs osc HRR PLL 2 PLL1 LRR SFG xtal Optical clock signal

  4. Ampl2 (Multi-pass, 50 Hz) SS THG Stab Pump Laser 2 cr-cor On the Synchronization of lasers for FEL facilityM.Danailov REF PLLs Error sig ? Ampl1 (Regen. , 1 KHz) ML Laser PP TS Pump Laser 1 TS: temporal shaping ; PP : pulse picker ; SS – spatial shaping ; Stab – pulse energy stabilization system PLLs – phase locking loops cr-cor : cross correlator (SFG intensity -> jitter)

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