Jitter-free terahertz pulses from LiNbO₃.

Area of Science:

• Physics
• Optics
• Materials Science

Background:

• Terahertz (THz) pulses are crucial for various scientific and technological applications.
• Time-critical applications demand high stability of THz field cycles relative to a reference clock.
• Existing methods struggle to achieve the required timing stability.

Purpose of the Study:

• To achieve ultimate stability of terahertz field cycles for time-critical applications.
• To report a novel method for nonlinear optical generation of stable terahertz single-cycle fields.
• To suppress timing jitter in terahertz pulse generation.

Main Methods:

• Nonlinear optical generation of terahertz single-cycle fields using femtosecond laser pulses.
• Passive compensation of timing jitter.
• Utilizing a lithium niobate (LiNbO3) slab as the nonlinear medium.
• Employing two silicon prisms for extracting and combining Cherenkov radiation.

Main Results:

• Achieved suppression of timing jitter to less than 200 attoseconds per micrometer of beam displacement.
• Demonstrated a factor of >70 improvement in timing jitter suppression compared to conventional non-collinear geometries.
• Successfully generated stable terahertz single-cycle fields.

Conclusions:

• The developed method offers a significant advancement in terahertz pulse generation stability.
• This technique is highly promising for time-critical applications requiring precise timing.
• The passive compensation of timing jitter in optical rectification is effective.