Excited-state absorption in Er: BaY2F8 and Cs3Er2Br9 and comparison with Er: LiYF4

The influence of Excited-State Absorption (ESA) on the green laser transition and the overlap of Ground-State Absorption (GSA) and ESA for 970 nm upconversion pumping in erbium is investigated in Er3+ : BaY2F8 and Cs3Er2Br9. Results are compared to Er3+ : LiYF4. In Er3+: BaY2F8, a good overlap between GSA and ESA is found at 969 nm in one polarization direction. The emission cross section at 550 nm is a factor of two smaller than in LiYF4. In Cs3Er2Br9, the smaller Stark splitting of the levels shifts the wavelengths of the green emission and ESA from4I1 3/2 off resonance. It enhances, however, ground-state reabsorption. The emission cross section at 550 nm is comparable to LiYF4. Upconversion leads to significant green fluorescence from2H9/2. A significant population of the4I11/2 level and ESA at 970 nm are not present under 800 nm pumping.

[1]  C. Pedrini,et al.  Excited-state absorption and energy transfer in Er3+ doped LiYF4 , 1986 .

[2]  H. Güdel,et al.  Dynamics of infrared-to-visible upconversion in Cs3Lu2Br9:1%Er3+ , 1994, Physical review. B, Condensed matter.

[3]  E. Heumann,et al.  Time-resolved spectra of excited-state absorption in Er3+ doped YAlO3 , 1992 .

[4]  Heinz P. Weber,et al.  Explanation of the cw operation of the Er3+ 3-µm crystal laser , 1994 .

[5]  H. Jenssen,et al.  Upconversion versus Pr-deactivation for efficient 3 mu m laser operation in Er , 1992 .

[6]  Hans P. Jenssen,et al.  Advanced solid-state lasers , 1991 .

[7]  H. Weber,et al.  Population mechanisms of the green Er3+:LiYF4 laser , 1995 .

[8]  R. Stephens,et al.  Diode-pumped upconversion laser with 100-mW output power. , 1993, Optics letters.

[9]  P. Xie,et al.  Visible cooperative upconversion laser in Er:LiYF(4). , 1992, Optics letters.

[10]  Günter Huber,et al.  Spectroscopy and green upconversion laser emission of Er3+‐doped crystals at room temperature , 1994 .

[11]  G. Huber,et al.  Infrared excited-state absorption and stimulated-emission cross sections of Er3+-doped crystals , 1995 .

[12]  Bruce H. T. Chai,et al.  Room‐temperature green laser emission of Er:LiYF4 , 1993 .

[13]  William J. Miniscalco,et al.  Excited state cross sections for Er-doped glasses , 1991, Other Conferences.

[14]  Hehlen,et al.  Upconversion in Er3+-dimer systems: Trends within the series Cs3Er2X9 (X=Cl,Br,I). , 1994, Physical review. B, Condensed matter.

[15]  R. A. McFarlane,et al.  Upconversion laser in BaY2F8:Er 5% pumped by ground-state and excited-state absorption , 1994 .

[16]  E. Heumann,et al.  Stimulated emission and excited-state absorption at room temperature on the 550 nm-laser transition in Er3+ doped YAlO3 , 1994 .

[17]  R. Retoux,et al.  Structure and raman spectroscopy of czochralski-grown barium yttrium and barium ytterbium fluorides crystals , 1993 .

[18]  Photon avalanche upconversion in Er/sup 3+/:YAlO/sub 3/ , 1995 .