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Optica Publishing Group
  • International Quantum Electronics Conference
  • 1996 OSA Technical Digest Series (Optica Publishing Group, 1996),
  • paper WD3

The new progress on the growth and characterization of laser self-frequency-doubling doping lutetium Nd3+: YAI3,(BO3)4 crystals

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Abstract

Nd3+:YAl3(BO3)4 (NYAB) crystal is one of the best laser self-frequency doubling crystals reported up to now. It is an attractive crystal for construction of compact LD pumped lasers since the requirement for a separate doubling crystal alleviated. However, the crystal optical quality is often cited as the main cause for the high laser pumping threshold, low optical to optical conversion efficiency and bad laser beam mode. The main reason is that we incorporate Nd3+ ions, which has much bigger ion radii than that of Y3+ ions, into YA13(B0,)4 crystals to take up the site of Y3+ ions. This is easier to produce deffects of lattice distortion, cloud, etc. So, we incorporate the Lu3+ ions, which is smaller than Y3* ions, into the crystal during the crystal growing to reduce the difference. This is called “Volume Compensation”. The Lu3+:Nd3+:YAl3(BO3)4 (LNYAB) crystal had been grown in our lab before. The initial laser experiment showed that the properties of this crystal lasers were much better than those of NYAB self-frequency doubling lasers pumped by LD. All of LNYAB self-frequency doubling lasers pumped by LD can operate in TEM00 Mode and the pumping threshold is less than one third of that of NYAB lasers. The laser efficiency also has increased greatly.

© 1996 Optical Society of America

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