Generation of 0.7 mJ multicycle 15 THz radiation by phase-matched optical rectification in lithium niobate
Dogeun Jang, Jae Hee Sung, Seong Ku Lee, Chul Kang, Ki‐Yong Kim
Abstract
We demonstrate efficient multicycle terahertz pulse generation at 14.6 THz from large-area lithium niobate crystals by using high-energy (up to 2 J) femtosecond Ti:sapphire laser pulses. Such terahertz radiation is produced by phase-matched optical rectification in lithium niobate. Experimentally, we achieve maximal terahertz energy of 0.71 mJ with conversion efficiency of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>∼</mml:mo> </mml:mrow> <mml:mn>0.04</mml:mn> <mml:mi mathvariant="normal">%</mml:mi> </mml:math> . Our experimental setup is simple and easily upscalable to produce multi-millijoule, multicycle terahertz radiation with proper lithium niobate crystals.