Nd:YVO4 and YVO4 laser crystal integration by a direct bonding technique

Akira Sugiyama; Hiroyasu Fukuyama; Masaki Katsumata; Yukikatsu Okada

doi:10.1117/12.468296

3 April 2003 Nd:YVO₄ and YVO₄ laser crystal integration by a direct bonding technique

Akira Sugiyama, Hiroyasu Fukuyama, Masaki Katsumata, Yukikatsu Okada

Proceedings Volume 4944, Integrated Optical Devices: Fabrication and Testing; (2003) https://doi.org/10.1117/12.468296
Event: Photonics Fabrication Europe, 2002, Bruges, Belgium

Abstract

Laser crystal integration using a neodymium-doped yttrium vanadate (or orthovanadate) laser crystal, and non-doped yttrium vanadate crystals that function as cold fingers has been demonstrated. In our bonding technique of YVO₄ crystals, a newly developed dry etching process was adopted in the preparation for contact of mechanically polished surfaces. In the successive heat treatment process, temperature optimization was essential to get rid of precipitation of vanadic acid caused by the thermo-chemical reaction in a vacuum furnace. The bonded surface of 5 mm × 6 mm was studied via optical characteristics and magnified inspection. In addition, we also compared the integrated crystal with a normal one in laser output power pumped by a CW laser diode. From these experiments, it was clear that the integrated Nd:YVO₄ laser crystal, securing the well-improved thermal conductivity, can increase laser output power nearly twice that of the conventional single crystal which was cracked in high power laser pumping due to its intrinsic poor thermal conductivity.

Citation Download Citation

Akira Sugiyama, Hiroyasu Fukuyama, Masaki Katsumata, and Yukikatsu Okada "Nd:YVO₄ and YVO₄ laser crystal integration by a direct bonding technique", Proc. SPIE 4944, Integrated Optical Devices: Fabrication and Testing, (3 April 2003); https://doi.org/10.1117/12.468296

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