Upconversion laser action at 469.7 and 560.6 nm in Er:YLiF4T. HebertR.M. MacFarlaneet al.1990IQEC 1990
Blue continuously pumped upconversion lasing in Tm:YLiF4T. HebertR. Wannemacheret al.1992Applied Physics Letters
Blue and green cw upconversion lasing in Er:YLiF4T. HebertR. Wannemacheret al.1990Applied Physics Letters