Easily variable and scalable terahertz pulse source based on tilted-pulse-front pumped semiconductors.

Area of Science:

• Optics and Photonics
• Terahertz Science and Technology

Background:

• Terahertz (THz) wave generation is crucial for various scientific and technological applications.
• Existing THz sources often involve complex microstructured components and limitations in scalability.
• Efficient and scalable THz generation methods are highly sought after.

Purpose of the Study:

• To propose a new, simplified terahertz (THz) source design.
• To investigate the scalability and adaptability of the proposed THz source.
• To analyze the impact of optical element configuration and polarization on THz generation efficiency.

Main Methods:

• The proposed THz source utilizes a volume phase holographic grating and a semiconductor nonlinear slab.
• The design avoids microstructuring and features a single diffraction order.
• Analysis includes evaluating the effects of anti-reflection (AR) coatings and different pump polarizations (s-pol and p-pol/TM mode).

Main Results:

• The proposed THz source consists of only two optical elements, offering a simplified setup.
• The design is scalable to large pump sizes without principal limitations and adaptable to various wavelengths.
• While p-pol (TM mode) reduces nonlinear polarization, the diminished Fresnel loss (without AR coating) can overcompensate for this effect, enhancing THz generation.

Conclusions:

• A new, highly adaptable, and scalable terahertz source is proposed, requiring minimal optical elements.
• The design's simplicity and lack of microstructuring offer practical advantages for THz wave generation.
• Optimization of polarization and anti-reflection strategies can further enhance the efficiency of this novel terahertz source.