München 2019 – scientific programme

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 4: Laser Systems II

K 4.2: Talk

Tuesday, March 19, 2019, 16:50–17:10, HS 3

A new laser source for highly efficient multi-cycle THz generation — •Halil Tarik Olgun — DESY, Hamburg, Deutschland

Increasing the efficiencies of multicycle terahertz (MC-THz) is a critical step for the realization of the novel concept of a table-top free electron laser powered by MC-THz [1]. We developed a multi-narrow-line laser source whose parameters, including intensity profile, temporal shape, and spectral content are optimized for MC-THz generation based on recent results of numerical simulations [2] showing high efficiencies for optical-to-THz conversion using difference frequency generation in a periodically-poled 2nd order nonlinear crystal. Starting from two CW-lasers, whose relative wavelength separation can be tuned to desired terahertz frequency, sub-nanosecond pulses are chopped via acousto- and electro-optical modulators and amplified to several milliwatts at 2MHz repetition rate. In the next step, these pulses will be amplified further to millijoule level in a regenerative amplifier and used for MC-THz in a cryo cooled periodically poled lithium niobate.