Journal Article

PUBDB-2019-04464

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spectral phase control of interfering chirped pulses for high-energy narrowband terahertz generation

Jolly, S. W. (Corresponding author)CFEL*Extern* ; Matlis, N. H.CFEL*DESY* ; Ahr, F.CFEL*CSSB* ; Leroux, V. ; Eichner, T.CFEL*Extern* ; Calendron, A.-L.CFEL*DESY* ; Ishizuki, H. ; Taira, T. ; Kärtner, F. X.CFEL*Extern*DESY* ; Maier, A. R.

2019
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-019-10657-4  doi:10.3204/PUBDB-2019-04464

Abstract: Highly-efficient optical generation of narrowband terahertz radiation enables unexplored technologies and sciences from compact electron acceleration to charge manipulation in solids. State-of-the-art conversion efficiencies are currently achieved using difference-frequency generation driven by temporal beating of chirped pulses but remain, however, far lower than desired or predicted. Here we show that high-order spectral phase fundamentally limits the efficiency of narrowband difference-frequency generation using chirped-pulse beating and resolve this limitation by introducing a novel technique based on tuning the relative spectral phase of the pulses. For optical terahertz generation, we demonstrate a 13-fold enhancement in conversion efficiency for 1%-bandwidth, 0.361 THz pulses, yielding a record energy of 0.6 mJ and exceeding previous optically-generated energies by over an order of magnitude. Our results prove the feasibility of millijoule-scale applications like terahertz-based electron accelerators and light sources and solve the long-standing problem of temporal irregularities in the pulse trains generated by interfering chirped pulses.

Note: PIF-2017-67

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Contributing Institute(s):

1. UNI/EXP (CFEL-LUX)
2. Ultrafast Lasers & X-rays Division (FS-CFEL-2)

Research Program(s):

1. 631 - Accelerator R & D (POF3-631) (POF3-631)
2. AXSIS - Frontiers in Attosecond X-ray Science: Imaging and Spectroscopy (609920) (609920)

Experiment(s):

1. Experiments at CFEL

Appears in the scientific report 2019

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