Shaping Pulses Before They are Born Avi Pe’er Physics Department and BINA center for nano-technology, Bar Ilan University FRISNO 11 Shai Yefet, Naaman.

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Presentation transcript:

Shaping Pulses Before They are Born Avi Pe’er Physics Department and BINA center for nano-technology, Bar Ilan University FRISNO 11 Shai Yefet, Naaman Amer ₪ - ISF, Kahn Foundation

Outline Why pulse shaping Standard techniques ◦ Mode locked oscillator cavity ◦ Extra-cavity shaping Intra cavity shaping – why not ? Gain shaping concept Results Conclusions

Pulse Shaping In Optics Control a pulse shape in time / spectrum Coherent quantum control Precision spectroscopy using frequency comb PRL 98, (2007) Label free Fluorescence microscopy with Stimulated Raman Science 322, (2008). Frequency domain picture Pump Dump τ vib t rep PumpDump Time domain picture

Standard Mode Locked Cavity (Ti:S) OC HR gain medium Pump 532 nm Mode competition (Gain, Loss, Dispersion) No knob on spectrum

Kerr Lens Mode Locked Cavities 1 st stability limit - Telescope 2 nd stability limit

Pulse Shaping (Extra-Cavity) Phase modulation: Simple, lossless Amplitude modulation: Lossy ! SLM

Intra Cavity Pulse Shaper ? OC HR gain medium Pump 532 nm In cavity phase = frequency shift No phase shaping ! Amplitude shaping = loss shaping Mode competition ! Two Colors – Impossible !

Two-Colors so far ? Active locking of independent lasers Opt. Lett. 27, 312 (2002) Passive Locking – shared Kerr medium Opt. Lett. 29, 629 (2004) OPO – signal and idler Synchronously pumped OPOs Time lens technique - Active modulation of a CW laser Optics Express 18, (2010)

Gain Shaping Spatial shaper OC HR 1st gain medium 2nd gain medium Beam splitter Pump 532 nm Spatial shape of pump = Spectral shape of gain

Results I Power (a.u.) Wavelength (nm)

Results II

Conclusions Multi lobed spectra in mode locked oscillators are important for many applications No easy solution so far – Synchronization of independent sources Gain shaping allows for arbitrary control of the oscillation spectrum.