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High-power and high-efficiency operation of a CW-diode-side-pumped Nd:YAG rod laser

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3 Author(s)
Fujikawa, Shuichi ; Adv. Technol. Res. & Dev. Center, Mitsubishi Electr. Corp., Hyogo, Japan ; Kojima, T. ; Yasui, K.

We have demonstrated high-power and high efficiency performance of a continuous-wave (CW) Nd:YAG laser with a simple and scalable side-pumping configuration. The maximum output power of 147 W was obtained in low brightness operation of M2=45. The corresponding electric efficiency is 14.8%. To our knowledge, this is the highest value reported for diode side-pumped Nd:YAG lasers. By using a rate and photon transport calculation, we have estimated the pumping efficiency of 72%. High brightness operation was also carried out by applying bifocusing compensation of the Nd:YAG rod. The brightness of 272 MW/cm2 sr with beam quality of M2=5.9 and output power of 107 W was obtained at the electric efficiency of 11.6%. The brightness and the electric efficiency are comparable with those of industrial high-power CO2 lasers that have been the first option for industrial applications

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:3 ,  Issue: 1 )