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High conversion efficiency, high energy terahertz pulses by optical rectification in cryogenically cooled lithium
Shu-Wei Huang1, Eduardo Granados, Wenqian Ronny Huang
1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Optics Letters
|March 5, 2013
Summary
Highly efficient terahertz (THz) generation was achieved using optical rectification in cryogenically cooled lithium niobate. This breakthrough significantly enhances THz pulse energy scaling for advanced applications.
Area of Science:
- Physics
- Materials Science
Background:
- Terahertz (THz) generation via optical rectification (OR) is crucial for various applications.
- Lithium niobate is a promising material for THz generation, but its absorption limits efficiency.
Purpose of the Study:
- To demonstrate highly efficient THz generation using cryogenically cooled lithium niobate.
- To investigate the impact of cryogenic cooling on THz absorption and conversion efficiency.
Main Methods:
- Optical rectification (OR) of 1.03 μm near-optimum pump pulses.
- Utilizing cryogenically cooled lithium niobate crystals.
- Employing a pulse duration of 680 fs and a pump energy of 1.2 mJ.
Main Results:
- Achieved conversion efficiencies exceeding 3.8±0.4%, an order of magnitude higher than previous reports.
- Demonstrated significant reduction in THz absorption due to cryogenic cooling.
- Enabled scaling of THz pulse energies to the millijoule level.
Conclusions:
- Cryogenic cooling of lithium niobate dramatically enhances THz generation efficiency via OR.
- This method offers a scalable pathway for high-energy THz pulse production.
- The findings pave the way for advanced THz technologies.
