We demonstrate that Kerr lens modelocking is well-suited for operating an ultrafast thin-disk laser with intra-oscillator high harmonic generation (HHG) in the 100-fs pulse duration regime. Exploiting nearly the full emission bandwidth of the gain material Yb:YAG, we generate 105-fs pulses with an intracavity peak power of 365 MW and an intracavity average power of 470 W. We drive HHG in argon with a peak intensity of ∼7⋅10 W/cm at a repetition rate of 11 MHz. Extreme-ultraviolet (XUV) light is generated up to the 31 harmonic order (H31) at 37 eV, with an average power of ∼0.4 µW in H25 at 30 eV. This work presents a considerable increase in performance of XUV sources based on intra-oscillator HHG and confirms that this approach is a promising technology for simple and portable XUV sources at MHz repetition rates.
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We report the realization of an intra-oscillator high harmonic source based on a Kerr lens mode locked Ti:sapphire laser running at 80 MHz repetition rate. A nonlinear medium consisting of an AlN nanofilm on a thin sapphire substrate is placed inside the oscillator cavity. The harmonics are generated, in reflection geometry, on the AlN nanofilm, directing the harmonic beam out of the cavity.
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- - Resonant enhancement in optical cavities boosts the efficiency of nonlinear optical processes, particularly in high harmonic generation for XUV sources, leading to higher repetition rates needed for applications like photoelectron spectroscopy and nuclear clock development.
- - Using mode-locked thin-disk laser oscillators presents a simplified alternative to passive enhancement cavities, achieving comparable driving conditions while being less sensitive to losses due to internal gain, thus improving conversion efficiencies.
- - The intra-oscillator approach outperforms traditional passive cavities in generating XUV flux, producing photon energies between 60 eV and 100 eV at a repetition rate of 17 MHz, and effectively delivering significant power at a desirable wavelength of 13.5 nm, relevant for the silicon industry.
We demonstrate that Kerr lens modelocking is well-suited for operating an ultrafast thin-disk laser with intra-oscillator high harmonic generation (HHG) in the 100-fs pulse duration regime. Exploiting nearly the full emission bandwidth of the gain material Yb:YAG, we generate 105-fs pulses with an intracavity peak power of 365 MW and an intracavity average power of 470 W. We drive HHG in argon with a peak intensity of ∼7⋅10 W/cm at a repetition rate of 11 MHz.
View Article and Find Full Text PDFWe demonstrate the carrier-envelope offset (CEO) frequency stabilization of a Kerr lens mode-locked Yb:LuO thin-disk laser oscillator operating in the strongly self-phase modulation (SPM) broadened regime. This novel approach allows overcoming the intrinsic gain bandwidth limit and is suited to support frequency combs from sub-100-fs pulse trains with very high output power. In this work, strong intra-oscillator SPM in the Kerr medium enables the optical spectrum of the oscillating pulse to exceed the bandwidth of the gain material Yb:LuO by a factor of two.
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