Search

A Nd3+ doped La3Ga5.5Ta0.5O14 (Nd:LGT) crystal has been grown by the Czochralski method for the first time. Absorption spectrum and fluorescence spectrum has been measured and the results show Nd:LGT crystal may emit 1064 nm wavelength laser when a laser-diode of 808 nm is used as pumping source. The laser experiment indicates the output power of Nd:LGT is 130 mW when the incident pumping power is 2.2 W. [Copyright &y& Elsevier]

Abstract: New data relating to flux growth, composition, homogeneity and physical characteristics of (R,Y)Al3(BO3)4 (R=Tm or Yb) crystals are discussed. Single crystals have been obtained using K2Mo3O10-based fluxes by spontaneous nucleation as well as by the top-seeded solution growth at cooling rates of 4.8–12°C/day and 0.2–5°C/day, respectively, in the temperature range from 1120 to 900°C. It is found that the average Tm and Yb segregation coefficients are close to unity, and vary from 0.80 to 1.02, as a consequence of minor difference in the sizes between Y3+ and R3+ cations. Two morphological types of (Tm,Y)Al3(BO3)4 crystals have been revealed. The average thermal expansion coefficients of Yb:YAB along a- and c-axis are measured as 2×10−6/K and 9.7×10−6/K, respectively, in the temperature range of 298–573K. The specific heat of the Yb:YAB crystal at room temperature is found to be 0.76J/gK, implying that this material can exhibit significant resistance to laser damage. Over 1.1W of green emission has been obtained from a diode pumped 3×3×3mm3 Yb:YAB crystal. The conversion efficiency of diode to green is 10%. High beam quality of green and IR emission can be easily attained due to the good crystal quality and lack of thermal effects. [Copyright &y& Elsevier]

Abstract. A comparative study of Nd:GdVO[sub 4] and Nd:YVO[sub 4] crystal lasers pumped by a cw diode laser has been conducted at the fundamental wavelengths of 1.06 micro m and 1.34 micro m, as well as when intracavity frequency-doubled to 532 nm and 670 nm, respectively. At these four wavelengths, maximum output powers from the Nd:GdVO[sub 4] crystal laser were 1.27 W, 800mW, 610mW, and 82mW at a diode-launched pump power of 2.9 W. The threshold pump powers were 64 mW, 159 mW, 5 mW, and 12 mW, respectively. All the results obtained from Nd:GdVO[sub 4] were superior to those of Nd:YVO[sub 4], indicating that Nd:GdVO[sub 4] is a more efficient laser crystal than Nd:YVO[sub 4] for diode-pumped solid-state lasers. [ABSTRACT FROM AUTHOR]