ThuliumV1, Pascal, Corpus, bibRecord, 000671

Investigation of infrared emission and lifetime in Tm-doped 75TeO2:20ZnO:5Na2O (mol%) glasses : Effect of Ho and Yb co-doping

Identifieur interne : 000671 ( Pascal/Corpus ); précédent : 000670; suivant : 000672

Investigation of infrared emission and lifetime in Tm-doped 75TeO2:20ZnO:5Na2O (mol%) glasses : Effect of Ho and Yb co-doping

Auteurs : Daniel Milanese ; Monica Vota ; QIUPING CHEN ; JIANJUN XING ; GUIHUA LIAO ; Hrvoje Gebavi ; Monica Ferraris ; Nicola Coluccelli ; Stefano Taccheo

Source :

Journal of non-crystalline solids [ 0022-3093 ] ; 2008.

RBID : Pascal:08-0230908

Descripteurs français

Pascal (Inist)
- Durée vie, Addition thulium, Codopage, Dopage, Concentration impureté, Fluorescence, Photoluminescence, Spectre résolution temporelle, Verre, Oxyde de zinc, Tellurite, Oxyde de sodium, Système ternaire.

English descriptors

KwdEn :
- Codoping, Doping, Fluorescence, Glass, Impurity density, Lifetime, Photoluminescence, Sodium oxide, Tellurites, Ternary systems, Thulium additions, Time resolved spectra, Zinc oxide.

Abstract

In this paper we describe fabrication and characterization of rare-earth-doped active tellurite glasses to be used as active laser media for fiber lasers emitting in the 2 μm region. The base composition is (mol%): 75TeO₂-20ZnO-5Na₂O with different concentrations of Tm³⁺, Yb³⁺ and Ho³⁺ as dopants or co-dopants. Optical properties of doped glasses were studied and pumping at 800 nm and at 980 nm were tested in order to compare the efficiency of two pumping mechanisms. Optical characterization carried out on glasses containing only Tm³⁺ ions indicated the optimum concentration of Tm₂O₃ in terms of emission efficiency as 1 wt%. The addition of 5 wt% of Yb₂O₃ to Tm³⁺-doped glasses led to the best results in terms of intensity of fluorescence emission and of lifetime values. Yb and Ho co-doped Tm-tellurite glass was measured in emission.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

A01	`01`	`1`		`@0 0022-3093`
A02	`01`			`@0 JNCSBJ`
A03		`1`		`@0 J. non-cryst. solids`
A05				`@2 354`
A06				`@2 18`
A08	`01`	`1`	`ENG`	`@1 Investigation of infrared emission and lifetime in Tm-doped 75TeO₂:20ZnO:5Na₂O (mol%) glasses : Effect of Ho and Yb co-doping`
A11	`01`	`1`		`@1 MILANESE (Daniel)`
A11	`02`	`1`		`@1 VOTA (Monica)`
A11	`03`	`1`		`@1 QIUPING CHEN`
A11	`04`	`1`		`@1 JIANJUN XING`
A11	`05`	`1`		`@1 GUIHUA LIAO`
A11	`06`	`1`		`@1 GEBAVI (Hrvoje)`
A11	`07`	`1`		`@1 FERRARIS (Monica)`
A11	`08`	`1`		`@1 COLUCCELLI (Nicola)`
A11	`09`	`1`		`@1 TACCHEO (Stefano)`
A14	`01`			`@1 Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino C.so Duca degli Abruzzi 24 @2 10129 Torino @3 ITA @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 4 aut. @Z 5 aut. @Z 6 aut. @Z 7 aut.`
A14	`02`			`@1 Dipartimento di Fisica, Politecnico di Milano, Piazza L. Da Vinci @2 20133 Milano @3 ITA @Z 8 aut. @Z 9 aut.`
A20				`@1 1955-1961`
A21				`@1 2008`
A23	`01`			`@0 ENG`
A43	`01`			`@1 INIST @2 14572 @5 354000172647070030`
A44				`@0 0000 @1 © 2008 INIST-CNRS. All rights reserved.`
A45				`@0 14 ref.`
A47	`01`	`1`		`@0 08-0230908`
A60				`@1 P`
A61				`@0 A`
A64	`01`	`1`		`@0 Journal of non-crystalline solids`
A66	`01`			`@0 NLD`
C01	`01`		`ENG`	@0 In this paper we describe fabrication and characterization of rare-earth-doped active tellurite glasses to be used as active laser media for fiber lasers emitting in the 2 μm region. The base composition is (mol%): 75TeO₂-20ZnO-5Na₂O with different concentrations of Tm³⁺, Yb³⁺ and Ho³⁺ as dopants or co-dopants. Optical properties of doped glasses were studied and pumping at 800 nm and at 980 nm were tested in order to compare the efficiency of two pumping mechanisms. Optical characterization carried out on glasses containing only Tm³⁺ ions indicated the optimum concentration of Tm₂O₃ in terms of emission efficiency as 1 wt%. The addition of 5 wt% of Yb₂O₃ to Tm³⁺-doped glasses led to the best results in terms of intensity of fluorescence emission and of lifetime values. Yb and Ho co-doped Tm-tellurite glass was measured in emission.
C02	`01`	`3`		`@0 001B70H55Q`
C03	`01`	`3`	`FRE`	`@0 Durée vie @5 02`
C03	`01`	`3`	`ENG`	`@0 Lifetime @5 02`
C03	`02`	`3`	`FRE`	`@0 Addition thulium @5 03`
C03	`02`	`3`	`ENG`	`@0 Thulium additions @5 03`
C03	`03`	`X`	`FRE`	`@0 Codopage @5 04`
C03	`03`	`X`	`ENG`	`@0 Codoping @5 04`
C03	`03`	`X`	`SPA`	`@0 Codrogado @5 04`
C03	`04`	`X`	`FRE`	`@0 Dopage @5 05`
C03	`04`	`X`	`ENG`	`@0 Doping @5 05`
C03	`04`	`X`	`SPA`	`@0 Doping @5 05`
C03	`05`	`X`	`FRE`	`@0 Concentration impureté @5 06`
C03	`05`	`X`	`ENG`	`@0 Impurity density @5 06`
C03	`05`	`X`	`SPA`	`@0 Concentración impureza @5 06`
C03	`06`	`3`	`FRE`	`@0 Fluorescence @5 07`
C03	`06`	`3`	`ENG`	`@0 Fluorescence @5 07`
C03	`07`	`3`	`FRE`	`@0 Photoluminescence @5 08`
C03	`07`	`3`	`ENG`	`@0 Photoluminescence @5 08`
C03	`08`	`3`	`FRE`	`@0 Spectre résolution temporelle @5 10`
C03	`08`	`3`	`ENG`	`@0 Time resolved spectra @5 10`
C03	`09`	`3`	`FRE`	`@0 Verre @5 15`
C03	`09`	`3`	`ENG`	`@0 Glass @5 15`
C03	`10`	`X`	`FRE`	`@0 Oxyde de zinc @5 16`
C03	`10`	`X`	`ENG`	`@0 Zinc oxide @5 16`
C03	`10`	`X`	`SPA`	`@0 Zinc óxido @5 16`
C03	`11`	`X`	`FRE`	`@0 Tellurite @2 NA @5 17`
C03	`11`	`X`	`ENG`	`@0 Tellurites @2 NA @5 17`
C03	`11`	`X`	`SPA`	`@0 Telurito @2 NA @5 17`
C03	`12`	`X`	`FRE`	`@0 Oxyde de sodium @5 18`
C03	`12`	`X`	`ENG`	`@0 Sodium oxide @5 18`
C03	`12`	`X`	`SPA`	`@0 Sodio óxido @5 18`
C03	`13`	`3`	`FRE`	`@0 Système ternaire @5 19`
C03	`13`	`3`	`ENG`	`@0 Ternary systems @5 19`
N21				`@1 147`

Format Inist (serveur)

NO :	PASCAL 08-0230908 INIST
ET :	Investigation of infrared emission and lifetime in Tm-doped 75TeO₂:20ZnO:5Na₂O (mol%) glasses : Effect of Ho and Yb co-doping
AU :	MILANESE (Daniel); VOTA (Monica); QIUPING CHEN; JIANJUN XING; GUIHUA LIAO; GEBAVI (Hrvoje); FERRARIS (Monica); COLUCCELLI (Nicola); TACCHEO (Stefano)
AF :	Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino C.so Duca degli Abruzzi 24/10129 Torino/Italie (1 aut., 2 aut., 3 aut., 4 aut., 5 aut., 6 aut., 7 aut.); Dipartimento di Fisica, Politecnico di Milano, Piazza L. Da Vinci/20133 Milano/Italie (8 aut., 9 aut.)
DT :	Publication en série; Niveau analytique
SO :	Journal of non-crystalline solids; ISSN 0022-3093; Coden JNCSBJ; Pays-Bas; Da. 2008; Vol. 354; No. 18; Pp. 1955-1961; Bibl. 14 ref.
LA :	Anglais
EA :	In this paper we describe fabrication and characterization of rare-earth-doped active tellurite glasses to be used as active laser media for fiber lasers emitting in the 2 μm region. The base composition is (mol%): 75TeO₂-20ZnO-5Na₂O with different concentrations of Tm³⁺, Yb³⁺ and Ho³⁺ as dopants or co-dopants. Optical properties of doped glasses were studied and pumping at 800 nm and at 980 nm were tested in order to compare the efficiency of two pumping mechanisms. Optical characterization carried out on glasses containing only Tm³⁺ ions indicated the optimum concentration of Tm₂O₃ in terms of emission efficiency as 1 wt%. The addition of 5 wt% of Yb₂O₃ to Tm³⁺-doped glasses led to the best results in terms of intensity of fluorescence emission and of lifetime values. Yb and Ho co-doped Tm-tellurite glass was measured in emission.
CC :	001B70H55Q
FD :	Durée vie; Addition thulium; Codopage; Dopage; Concentration impureté; Fluorescence; Photoluminescence; Spectre résolution temporelle; Verre; Oxyde de zinc; Tellurite; Oxyde de sodium; Système ternaire
ED :	Lifetime; Thulium additions; Codoping; Doping; Impurity density; Fluorescence; Photoluminescence; Time resolved spectra; Glass; Zinc oxide; Tellurites; Sodium oxide; Ternary systems
SD :	Codrogado; Doping; Concentración impureza; Zinc óxido; Telurito; Sodio óxido
LO :	INIST-14572.354000172647070030
ID :	08-0230908

Links to Exploration step

Pascal:08-0230908

Le document en format XML

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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Investigation of infrared emission and lifetime in Tm-doped 75TeO<sub>2</sub>
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O (mol%) glasses : Effect of Ho and Yb co-doping</title>
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<series><title level="j" type="main">Journal of non-crystalline solids</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Codoping</term>
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<term>Fluorescence</term>
<term>Glass</term>
<term>Impurity density</term>
<term>Lifetime</term>
<term>Photoluminescence</term>
<term>Sodium oxide</term>
<term>Tellurites</term>
<term>Ternary systems</term>
<term>Thulium additions</term>
<term>Time resolved spectra</term>
<term>Zinc oxide</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Durée vie</term>
<term>Addition thulium</term>
<term>Codopage</term>
<term>Dopage</term>
<term>Concentration impureté</term>
<term>Fluorescence</term>
<term>Photoluminescence</term>
<term>Spectre résolution temporelle</term>
<term>Verre</term>
<term>Oxyde de zinc</term>
<term>Tellurite</term>
<term>Oxyde de sodium</term>
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<front><div type="abstract" xml:lang="en">In this paper we describe fabrication and characterization of rare-earth-doped active tellurite glasses to be used as active laser media for fiber lasers emitting in the 2 μm region. The base composition is (mol%): 75TeO<sub>2</sub>
-20ZnO-5Na<sub>2</sub>
O with different concentrations of Tm<sup>3+</sup>
, Yb<sup>3+</sup>
 and Ho<sup>3+</sup>
 as dopants or co-dopants. Optical properties of doped glasses were studied and pumping at 800 nm and at 980 nm were tested in order to compare the efficiency of two pumping mechanisms. Optical characterization carried out on glasses containing only Tm<sup>3+</sup>
 ions indicated the optimum concentration of Tm<sub>2</sub>
O<sub>3</sub>
 in terms of emission efficiency as 1 wt%. The addition of 5 wt% of Yb<sub>2</sub>
O<sub>3</sub>
 to Tm<sup>3+</sup>
-doped glasses led to the best results in terms of intensity of fluorescence emission and of lifetime values. Yb and Ho co-doped Tm-tellurite glass was measured in emission.</div>
</front>
</TEI>
<inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0022-3093</s0>
</fA01>
<fA02 i1="01"><s0>JNCSBJ</s0>
</fA02>
<fA03 i2="1"><s0>J. non-cryst. solids</s0>
</fA03>
<fA05><s2>354</s2>
</fA05>
<fA06><s2>18</s2>
</fA06>
<fA08 i1="01" i2="1" l="ENG"><s1>Investigation of infrared emission and lifetime in Tm-doped 75TeO<sub>2</sub>
:20ZnO:5Na<sub>2</sub>
O (mol%) glasses : Effect of Ho and Yb co-doping</s1>
</fA08>
<fA11 i1="01" i2="1"><s1>MILANESE (Daniel)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>VOTA (Monica)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>QIUPING CHEN</s1>
</fA11>
<fA11 i1="04" i2="1"><s1>JIANJUN XING</s1>
</fA11>
<fA11 i1="05" i2="1"><s1>GUIHUA LIAO</s1>
</fA11>
<fA11 i1="06" i2="1"><s1>GEBAVI (Hrvoje)</s1>
</fA11>
<fA11 i1="07" i2="1"><s1>FERRARIS (Monica)</s1>
</fA11>
<fA11 i1="08" i2="1"><s1>COLUCCELLI (Nicola)</s1>
</fA11>
<fA11 i1="09" i2="1"><s1>TACCHEO (Stefano)</s1>
</fA11>
<fA14 i1="01"><s1>Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino C.so Duca degli Abruzzi 24</s1>
<s2>10129 Torino</s2>
<s3>ITA</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
<sZ>6 aut.</sZ>
<sZ>7 aut.</sZ>
</fA14>
<fA14 i1="02"><s1>Dipartimento di Fisica, Politecnico di Milano, Piazza L. Da Vinci</s1>
<s2>20133 Milano</s2>
<s3>ITA</s3>
<sZ>8 aut.</sZ>
<sZ>9 aut.</sZ>
</fA14>
<fA20><s1>1955-1961</s1>
</fA20>
<fA21><s1>2008</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>14572</s2>
<s5>354000172647070030</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2008 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>14 ref.</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>08-0230908</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Journal of non-crystalline solids</s0>
</fA64>
<fA66 i1="01"><s0>NLD</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>In this paper we describe fabrication and characterization of rare-earth-doped active tellurite glasses to be used as active laser media for fiber lasers emitting in the 2 μm region. The base composition is (mol%): 75TeO<sub>2</sub>
-20ZnO-5Na<sub>2</sub>
O with different concentrations of Tm<sup>3+</sup>
, Yb<sup>3+</sup>
 and Ho<sup>3+</sup>
 as dopants or co-dopants. Optical properties of doped glasses were studied and pumping at 800 nm and at 980 nm were tested in order to compare the efficiency of two pumping mechanisms. Optical characterization carried out on glasses containing only Tm<sup>3+</sup>
 ions indicated the optimum concentration of Tm<sub>2</sub>
O<sub>3</sub>
 in terms of emission efficiency as 1 wt%. The addition of 5 wt% of Yb<sub>2</sub>
O<sub>3</sub>
 to Tm<sup>3+</sup>
-doped glasses led to the best results in terms of intensity of fluorescence emission and of lifetime values. Yb and Ho co-doped Tm-tellurite glass was measured in emission.</s0>
</fC01>
<fC02 i1="01" i2="3"><s0>001B70H55Q</s0>
</fC02>
<fC03 i1="01" i2="3" l="FRE"><s0>Durée vie</s0>
<s5>02</s5>
</fC03>
<fC03 i1="01" i2="3" l="ENG"><s0>Lifetime</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="3" l="FRE"><s0>Addition thulium</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="3" l="ENG"><s0>Thulium additions</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Codopage</s0>
<s5>04</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Codoping</s0>
<s5>04</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Codrogado</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Dopage</s0>
<s5>05</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Doping</s0>
<s5>05</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Doping</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Concentration impureté</s0>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Impurity density</s0>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Concentración impureza</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="3" l="FRE"><s0>Fluorescence</s0>
<s5>07</s5>
</fC03>
<fC03 i1="06" i2="3" l="ENG"><s0>Fluorescence</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="3" l="FRE"><s0>Photoluminescence</s0>
<s5>08</s5>
</fC03>
<fC03 i1="07" i2="3" l="ENG"><s0>Photoluminescence</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="3" l="FRE"><s0>Spectre résolution temporelle</s0>
<s5>10</s5>
</fC03>
<fC03 i1="08" i2="3" l="ENG"><s0>Time resolved spectra</s0>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="3" l="FRE"><s0>Verre</s0>
<s5>15</s5>
</fC03>
<fC03 i1="09" i2="3" l="ENG"><s0>Glass</s0>
<s5>15</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Oxyde de zinc</s0>
<s5>16</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Zinc oxide</s0>
<s5>16</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Zinc óxido</s0>
<s5>16</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Tellurite</s0>
<s2>NA</s2>
<s5>17</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Tellurites</s0>
<s2>NA</s2>
<s5>17</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Telurito</s0>
<s2>NA</s2>
<s5>17</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Oxyde de sodium</s0>
<s5>18</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Sodium oxide</s0>
<s5>18</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Sodio óxido</s0>
<s5>18</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE"><s0>Système ternaire</s0>
<s5>19</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG"><s0>Ternary systems</s0>
<s5>19</s5>
</fC03>
<fN21><s1>147</s1>
</fN21>
</pA>
</standard>
<server><NO>PASCAL 08-0230908 INIST</NO>
<ET>Investigation of infrared emission and lifetime in Tm-doped 75TeO<sub>2</sub>
:20ZnO:5Na<sub>2</sub>
O (mol%) glasses : Effect of Ho and Yb co-doping</ET>
<AU>MILANESE (Daniel); VOTA (Monica); QIUPING CHEN; JIANJUN XING; GUIHUA LIAO; GEBAVI (Hrvoje); FERRARIS (Monica); COLUCCELLI (Nicola); TACCHEO (Stefano)</AU>
<AF>Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino C.so Duca degli Abruzzi 24/10129 Torino/Italie (1 aut., 2 aut., 3 aut., 4 aut., 5 aut., 6 aut., 7 aut.); Dipartimento di Fisica, Politecnico di Milano, Piazza L. Da Vinci/20133 Milano/Italie (8 aut., 9 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of non-crystalline solids; ISSN 0022-3093; Coden JNCSBJ; Pays-Bas; Da. 2008; Vol. 354; No. 18; Pp. 1955-1961; Bibl. 14 ref.</SO>
<LA>Anglais</LA>
<EA>In this paper we describe fabrication and characterization of rare-earth-doped active tellurite glasses to be used as active laser media for fiber lasers emitting in the 2 μm region. The base composition is (mol%): 75TeO<sub>2</sub>
-20ZnO-5Na<sub>2</sub>
O with different concentrations of Tm<sup>3+</sup>
, Yb<sup>3+</sup>
 and Ho<sup>3+</sup>
 as dopants or co-dopants. Optical properties of doped glasses were studied and pumping at 800 nm and at 980 nm were tested in order to compare the efficiency of two pumping mechanisms. Optical characterization carried out on glasses containing only Tm<sup>3+</sup>
 ions indicated the optimum concentration of Tm<sub>2</sub>
O<sub>3</sub>
 in terms of emission efficiency as 1 wt%. The addition of 5 wt% of Yb<sub>2</sub>
O<sub>3</sub>
 to Tm<sup>3+</sup>
-doped glasses led to the best results in terms of intensity of fluorescence emission and of lifetime values. Yb and Ho co-doped Tm-tellurite glass was measured in emission.</EA>
<CC>001B70H55Q</CC>
<FD>Durée vie; Addition thulium; Codopage; Dopage; Concentration impureté; Fluorescence; Photoluminescence; Spectre résolution temporelle; Verre; Oxyde de zinc; Tellurite; Oxyde de sodium; Système ternaire</FD>
<ED>Lifetime; Thulium additions; Codoping; Doping; Impurity density; Fluorescence; Photoluminescence; Time resolved spectra; Glass; Zinc oxide; Tellurites; Sodium oxide; Ternary systems</ED>
<SD>Codrogado; Doping; Concentración impureza; Zinc óxido; Telurito; Sodio óxido</SD>
<LO>INIST-14572.354000172647070030</LO>
<ID>08-0230908</ID>
</server>
</inist>
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Investigation of infrared emission and lifetime in Tm-doped 75TeO2:20ZnO:5Na2O (mol%) glasses : Effect of Ho and Yb co-doping

Investigation of infrared emission and lifetime in Tm-doped 75TeO2:20ZnO:5Na2O (mol%) glasses : Effect of Ho and Yb co-doping

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