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Cascaded third-harmonic generation with one KDP crystal.

Hongwei Qi, Zhengping Wang, Fapeng Yu

|December 16, 2016

Summary

This summary is machine-generated.

Researchers achieved efficient third-harmonic generation (THG) in a single potassium dihydrogen phosphate (KDP) crystal. This method utilizes the identical phase-matching directions for second-harmonic generation (SHG) and THG, enabling cascaded frequency upconversion.

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Area of Science:

Nonlinear optics
Laser physics
Materials science

Background:

Potassium dihydrogen phosphate (KDP) crystals are crucial for nonlinear optical applications.
Efficient frequency conversion is essential for various laser technologies.
Type-II second-harmonic generation (SHG) and third-harmonic generation (THG) in KDP share similar phase-matching directions.

Purpose of the Study:

To design and demonstrate a compact third-harmonic generation (THG) converter using a single KDP crystal.
To leverage the identical phase-matching properties of SHG and THG in KDP for cascaded frequency upconversion.
To achieve high THG conversion efficiency for 1 μm lasers.

Main Methods:

Utilized a single KDP crystal for both SHG and THG processes.
Employed a quarter-wave plate to adjust the polarization of the second-harmonic wave.
Implemented a round-trip optical path to facilitate successive SHG and THG.
Used a 1064 nm, 40 ps pulse laser as the fundamental light source.

Main Results:

Achieved a maximum THG output of 1.13 mJ at 355 nm.
Obtained the highest THG conversion efficiency of 30.7%.
Demonstrated cascaded frequency upconversion in a single bulk nonlinear optical crystal for the first time.

Conclusions:

The designed KDP-based THG converter is highly efficient and cost-effective.
This method offers advantages such as a wide working waveband and applicability to other nonlinear crystals.
Represents a significant advancement for future laser frequency conversion applications.