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Angular engineering strategy of an additional periodic phase for widely tunable phase-matched deep-ultraviolet second
Mingchuan Shao1, Fei Liang1, Haohai Yu2
1State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan, 250100, China.
Light, Science & Applications
|February 5, 2022
Summary
Researchers developed a new angular engineering strategy for tunable phase matching, enabling efficient deep-ultraviolet second harmonic generation (SHG) over a wide wavelength range. This breakthrough offers a novel nonlinear photonic device for tunable deep-UV radiation.
Area of Science:
- Nonlinear optics
- Photonics
- Quantum optics
Background:
- Light phase manipulation is crucial for understanding light-matter interactions and optimizing nonlinear optical processes.
- Achieving tunable phase matching for processes like second harmonic generation (SHG) has been a long-standing challenge.
Purpose of the Study:
- To introduce and demonstrate a novel "additional periodic phase" (APP) angular engineering strategy for tunable phase matching.
- To experimentally achieve widely tunable, phase-matched second harmonic generation (SHG) in the deep-ultraviolet (deep-UV) spectrum.
Main Methods:
- Implementation of the APP strategy using a quartz crystal.
- Angularly compensating the phase difference between fundamental and frequency-doubled light.
- Experimental demonstration of SHG across the deep-UV range.
Main Results:
- Achieved unprecedented, efficient frequency doubling from 221 to 332 nm.
- Demonstrated widely tunable phase-matched SHG.
- Realized all possible phase-matching types simultaneously under APP conditions.
Conclusions:
- The APP strategy provides a practical method for tunable phase matching in nonlinear optics.
- This work presents a novel nonlinear photonic device for tunable deep-UV radiation.
- The findings contribute to a deeper understanding of light-matter interactions.
