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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Laser Systems II
K 4.3: Vortrag
Dienstag, 19. März 2019, 17:10–17:30, HS 3
A new laser source for highly efficient multi-cycle THz generation — •Halil Tarik Olgun1,2,3, Wenlong Tian1,4, Damian Schimpf1, Nicholas H. Matlis1, and Franz X. Kärtner1,2,3 — 1DESY, Hamburg, Germany — 2University of Hamburg, Hamburg, Germany — 3Helmholtz-Institut Jena, Jena, Germany — 4School of Physics and Optoelectronic Engineering, Xian, China
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.
References
[1] F. X. Kärtner et al., Nucl. Instrum. Methods Phys. Res. A 829, 24*29 (2016).
[2] K. Ravi et al., Opt. Express 24, 25582-25607 (2016).