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Watt-level self-frequency-doubling Nd:GdCOB lasers.

Jiyang Wang¹, Huaijin Zhang, Zhengping Wang

¹1State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China. jywang@sdu.edu.cn

|July 1, 2010

Summary

We demonstrated a high-power green laser using diode-pumped self-frequency doubling Nd:GdCa4O(BO3)3. This laser achieves 1.35 W output power and 17% efficiency, surpassing previous results for a more competitive green laser source.

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Area of Science:

Optics and Photonics
Solid-State Lasers
Nonlinear Optics

Background:

Self-frequency doubling (SFD) lasers offer compact and efficient light sources.
Nd:GdCa4O(BO3)3 (Nd:GdCOB) is a promising material for SFD applications.
Previous Nd:LnCa4O(BO3)3 (Ln=Y or Gd) SFD lasers had limited output power.

Purpose of the Study:

To demonstrate a high-power, efficient laser-diode (LD) pumped Nd:GdCOB SFD laser.
To investigate the factors contributing to enhanced output power and efficiency.
To assess the potential of this laser for commercial applications.

Main Methods:

Utilizing a laser-diode (LD) pumped Nd:GdCa4O(BO3)3 (Nd:GdCOB) crystal.
Optimizing the crystal's cutting direction for phase-matching.

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Characterizing the laser output power, efficiency, and emission wavelength.

Main Results:

Achieved a continuous-wave output power of 1.35 W, a five-fold increase over previous Nd:LnCa4O(BO3)3 SFD lasers.
Attained a maximum optical conversion efficiency of 17%.
Observed an emission wavelength centered at approximately 545 nm.

Conclusions:

The cutting direction along the optimal phase-matching direction is crucial for watt-level efficient output.
This efficient 545 nm green laser represents a significant advancement in SFD technology.
The demonstrated laser is highly competitive for applications in laser display, medical treatment, and spectroscopic analysis.