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Broadband second-harmonic-generation in GdCOB crystals.

Xuezhi Zhao, Zhengping Wang, Xinle Wang

|March 18, 2022

Summary

Broadband second-harmonic generation (SHG) was achieved in GdCOB crystals, demonstrating efficient frequency doubling. This research achieved a 56% conversion efficiency and a 16 nm output bandwidth for tunable laser sources.

Area of Science:

Nonlinear Optics
Solid-State Lasers
Materials Science

Background:

Second-harmonic generation (SHG) is crucial for frequency conversion in lasers.
GdCOB (GdCa4O(BO3)3) crystals are promising nonlinear optical materials.
Broadband SHG enables tunable laser sources for various applications.

Purpose of the Study:

To demonstrate broadband second-harmonic generation (SHG) in GdCOB crystals for the first time.
To investigate the type-I frequency doubling characteristics of GdCOB.
To determine the optimal phase-matching conditions for efficient SHG.

Main Methods:

Theoretical calculations of phase-matching properties.
Experimental verification of type-I frequency doubling.

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Utilizing a tunable broadband fundamental laser source (1.55-1.7 µm).

Main Results:

The spectral retracing point for phase-matching was identified around 1.65 µm.
Efficient SHG was achieved across the broadband fundamental laser tuning range.
The highest demonstrated conversion efficiency reached 56%.
An output bandwidth of 16 nm for the second harmonic was realized.

Conclusions:

GdCOB crystals are effective for broadband SHG applications.
The crystal's properties allow for efficient frequency doubling of tunable laser sources.
This work paves the way for developing advanced tunable laser systems.