Comparison of Laser Performance of Nd-Doped YVO4, GdVO4, Ca5(PO4)3F, Sr5(PO4)3F and Sr5(VO4)3F

Abstract

For simple, efficient, single mode cw lasing under low power (< 100 mW) laser diode pumping, the Nd laser hosts must possess exceptional high στ (cross-section - lifetime) product and high absorption cross-section at near 810 nm pumping wavelength. We identify two family of compounds, namely, YVO4 and GdVO4 as one and Sr5(PO4)3F, Ca5(PO4)3F and Sr5(VO4)3F as the other, which can satisfy the requirements. Direct comparison was made among the five compounds based on physical properties, spectroscopy, lasing performance and crystal growth. We found that Nd doped YVO4, GdVO4 and Sr5(PO4)3F have near identical lasing efficiency whereas Ca5(PO4)3F and Sr5(VO4)3F are just slightly lower due to multi-site problem. However, when all the four factors are considered, Nd:Sr5(PO4)3F has the best chance to satisfy the criteria of consistency in performance and availability in large quantities.