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  • 2013 Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
  • (Optica Publishing Group, 2013),
  • paper CG_5_2

Direct Carrier-Envelope Phase Control of an Amplified Laser System

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Abstract

Carrier-envelope control is one of the key technologies for attosecond pulse generation. Although the timing jitter between the carrier and the envelope has recently been demonstrated down to sub-10-attosecond range [1], CEP control is still limited to a rather narrow class of lasers, including Ti:sapphire and some other selected broadband laser materials. Typically, stabilization of a CPA laser source relies on an intricate combination of two servo loops, a fast oscillator loop and a slow amplifier loop [2]. While the second loop partially removes residual phase drift in the amplifier, unfortunately, it also corrupts the residual phase noise in the amplified pulse train due to the limited feedback bandwidth [3]. While oscillators can nowadays be stabilized down to ≈10 mrad residual CEP jitter, a 100 mrad stability for an amplified laser source is already a challenge. Here we demonstrate a direct method to stabilize the CEP of an Yb:KGW MOPA laser system, resulting in sub-100 mrad stability. To the best of our knowledge, this value surpasses most previously measured CEP jitter for Ti:sapphire CPA systems as well as any previous attempt to stabilize Yb-based oscillator and amplifier systems [4]. This is a crucial step in widening the utility of amplifier femtosecond Yb sources, which are easily scalable in average power and pulse energy but could not be meaningfully employed in attosecond optics until now, given the difficulty of their CEP control.

© 2013 IEEE

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