Mode-Locking with Ultra-Low Intra-Cavity Pulse Intensity Using Enhanced Kerr Nonlinearity

Mallachi Elia Meller, Shai Yefet, Avi Pe'er

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Kerr lens mode locking strongly depends upon intensity. Low pulse intensity weakens the nonlinear Kerr lens, and eventually mode locking is not supported. We demonstrate efficient mode-locking in a Ti:Sapphire laser oscillator with record-low intra-cavity pulse intensity (18 GW/cm2) and intra-cavity average power (340 mW). Using an additional nonlinear window in the cavity, the Kerr nonlinearity can be enhanced by an order of magnitude compared to the standard Ti:Sapphire cavity, allowing mode locking with an output coupler reflectivity as low as R = 55% and record-low intra-cavity pulse intensity. Our results provide an important new possibility to control mode-locking in cavities with very low intra-cavity pulse intensity, such as semiconductor laser oscillators and high-repetition rate mode-locked lasers.

Original languageEnglish
Article number7857685
JournalIEEE Journal of Quantum Electronics
Issue number2
StatePublished - Apr 2017

Bibliographical note

Funding Information:
This work was supported by the Israel Science Foundation under Grant 807/09, 46/14.

Publisher Copyright:
© 2017 IEEE.


  • Titanium-sapphire lasers
  • laser mode locking
  • ultrafast nonlinear optics


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