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MHz-repetition-rate, sub-mW, multi-octave THz wave generation in HMQ-TMS.
- Source :
-
Optics express [Opt Express] 2020 Mar 30; Vol. 28 (7), pp. 9631-9641. - Publication Year :
- 2020
-
Abstract
- We demonstrate the first megahertz (MHz) repetition-rate, broadband terahertz (THz) source based on optical rectification in the organic crystal HMQ-TMS driven by a femtosecond Yb:fibre laser. Pumping at 1035 nm with 30 fs pulses, we achieve few-cycle THz emission with a smooth multi-octave spectrum that extends up to 6 THz at -30 dB, with conversion efficiencies reaching 10 <superscript>-4</superscript> and an average output power of up to 0.38 mW. We assess the thermal damage limit of the crystal and conclude a maximum fluence of ∼1.8 mJ·cm <superscript>-2</superscript> at 10 MHz with a 1/e <superscript>2</superscript> pump beam diameter of 0.10 mm. We compare the performance of HMQ-TMS with the prototypical inorganic crystal gallium phosphide (GaP), yielding a tenfold electric field increase with a peak on-axis field strength of 7 kV·cm <superscript>-1</superscript> and almost double the THz bandwidth. Our results further demonstrate the suitability of organic crystals in combination with fibre lasers for repetition-rate scaling of broadband, high-power THz sources for time-domain spectroscopic applications.
Details
- Language :
- English
- ISSN :
- 1094-4087
- Volume :
- 28
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Optics express
- Publication Type :
- Academic Journal
- Accession number :
- 32225566
- Full Text :
- https://doi.org/10.1364/OE.386604