Adaptive spatiotemporal optical pulse front tilt using a digital micromirror device and its terahertz application

Area of Science:

• Optics and Photonics
• Ultrafast Lasers
• Terahertz Science

Background:

• Ultrashort optical pulses are crucial for advanced applications.
• Controlling pulse properties like pulse front tilt (PFT) is essential for optimizing nonlinear optical processes.
• Conventional methods for generating PFT, such as using gratings, can suffer from wavelength dispersion.

Purpose of the Study:

• To introduce a novel method for temporal and spatial manipulation of the PFT intensity profile of ultrashort optical pulses.
• To demonstrate the use of a digital micromirror device (DMD) for generating PFT.
• To showcase terahertz (THz) generation using DMD-derived PFT pumping.

Main Methods:

• Utilized a commercial digital micromirror device (DMD) to shape the intensity profile of ultrashort optical pulses.
• Implemented a PFT pumping scheme derived from the DMD for terahertz generation.
• Employed a lithium niobate crystal for the demonstration of THz generation.

Main Results:

• Successfully demonstrated temporal and spatial manipulation of PFT using a DMD.
• Achieved terahertz generation in lithium niobate via the DMD-based PFT pumping scheme.
• The DMD-based method showed no wavelength dispersion, unlike grating-based approaches.

Conclusions:

• The adaptive functionality of DMDs provides a convenient and effective alternative to gratings for generating PFT.
• DMD-based PFT generation offers advantages such as the absence of wavelength dispersion.
• This method is suitable for efficient optical rectification under noncollinear phase-matching conditions.