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305-600 † ç ¡MTÖh ‚ ½Ó"é¶@/†<Ɠ§ Óüto†<Æõ, ‚½Ó"é

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(1)

Ho3+Ñ÷ Tm3+ TÆXØT Y8ÈcÜR Y3Al5O12 +sÇXNË8ý ]kù°ËÑ — ¤VRË

†ç

¡¹ÿ›öB · "Õ.>

Â

Òâ@<Ɠ§ Óüto<Æõ, ÂÒíߖ 608-737

L

|*å£

² D

G~½Óõ<ƃ¨™è, @ 305-600

† ç

¡MTÖh

‚

½Ó"é@<Ɠ§ Óüto<Æõ, ‚½Ó"é 641-773 (2003¸ 2Z4 11{9 ~ÃÎ6£§)

Y3Al5O12&ñ\ '‘)aTm3+ü< Ho3+s:r_ YUs$ ìrF <Æ&h :£¤$í`¦›¸ %i. Ho3+_5F5

ï

r0< Tm3+_3F2 ïr0A\¦ #Œl #Œ UV\"f 0lot ©œ~½Ó„8Š+þAF gõ Ô„“ɐo\"f IR t ~½Ó

„



8Š +þAF g`¦›'1Ï %i. #Œl Û¼&7˜àÔ!3, ~½Óئ Û¼&7˜àÔ!3 x9 ú"îrߖ`¦ 8£¤&ñ #Œ +þAF g~½Óئõ&ñ`¦ ì

r$3 %i. ©œ~½Ó„8Š+þAF g_ âĺ Ho3+H STEPõ&ñ`¦, Tm3+H STEPõ ETUs ™D¥½+˝)aõ&ñ`¦



5g {9#QzŒ¤.

PACS numbers: 78

Keywords: Y3Al5O12, Tm3+, Ho3+, ©œ~½Ó„8Š, +þAF g,\-t „ú˜

I. "e Â]Ø

Ho3+s:Ér #ŒQ —¸^‰(host) Óüt|9\ '‘÷&#Q 2 µm Â

ÒH_ YUs$ „s(5I75I8)\¦ {9¼†. 2 µm ©œ“Ér eye-safe %ò%i¼–Ð YUs$ 6£x6 x €\"f @ߖy ׿כ¹ôÇ ƒ

½

¨ìr [1]. YUs$ *3iç ´òÖ¦`¦ Z}sl 0A #Œ Ho3+ü<

†<

Êa Tm3+\¦ 7£xyŒ™]Ð"f '‘ôÇ [2]. Tm3+s:Ér f¨ Ã

º éߖ€&hs H 780 nm ÂÒH_ 3F4 ïr0A\¦ t 9 “¦ Ø

¦§4 s¸×¼ YUs$_ ©œ #30< {9uÇ. "f 780 nm s¸×¼ YUs$Ð Tm3+_3F4 ïr0Ð #Œl 

€

 Ho3+_5I7ïr0Ð_ \-t „ú˜`¦ :Ÿx #Œ ´òÖ¦&h 2 µm YUs$\¦ %3`¦ ú e”. ÕªQ YUs$ „s {9

#

QltH Tm3+, Ho3+¿º 7áxÀÓ_ s:r[þts_ \



-t „ú˜, \-t ©œ~½Ó„8Š(upconversion),q~½Ó „s 1

p

x 4Ÿ¤¸úšôÇ õ&ñ`¦u>)a. sÇ ©œ ñŒ•6 xõ&ñ\

"

f µ1ÏÒqt H#ŒQ ‰&³©œ[þt\ @Ç ƒ¨H@/©œ Óüt|9 ^‰ _

 Óüto&h :£¤$í`¦sK > ½+É ÷r ëߖ m z´6 x0px ô

Ç “¦^‰ YUs$\¦>1Ï HX¸ @ߖy ׿כ¹ôÇ {9s.

‘

:r ƒ¨_ @/©œ Óüt|9 Y3Al5O12(Yttrium Aluminium Garnet, YAG) &ñ“ÉrYUs$ —¸^‰ Óüt|9Ð"f ¸ú˜ ·ú˜94R e”

¼ 9 Õª ׿\"f Nd3+ '‘)a YAG &ñ“Ér “¦^‰ YU

E-mail: [email protected]

s

$Ð"f ©œ6 x&#Q V,o s6 x÷¦ e”. YAG\ '‘

)

aTm3+ü< Ho3+_ \-t ïr0H f¨Ãº x9 +þAF gÛ¼&7˜àÔ

!

3 ìr$3¼–Ð ·ú˜ ú e”¼ 9 sp #ŒQ ƒ¨[þt\ _K µ1Ï

³

ð÷&%3 [3, 4]. YAG:Ho3+:Tm3+_ 2 µm YUs$ :£¤$í

“

Ér Tyminski 1px [5]\ _ #Œ ƒ¨÷&%3¼ 9 Falconieri 1px [6]“Ér 780 nms¸×¼ YUs$ *3iç\ _Ç ZÉr\-t ï

r0ÐÂÒ' „sH +þAF g_ 1l4<Æ&h :£¤$í`¦˜Ð“¦ %i



. ÕªQ YAG:Ho3+:Tm3+&ñ_ UV %ò%i\"f IR %ò

%

it µ1ÏÒqt H F g#30Ç %ò%i_ ©œ~½Ó„8Š x9 ~½Ó„

¨8

Š(down-conversion) +þAF gBj&m7£§“Ér ¸ú˜ ·ú˜9tt ·ú§“¦ e”

. ‘:r ƒ¨\"H Ho3+ü< Tm3+ '‘)aYAG &ñ

`

¦ 630 nm\"f 660 nm s_ ҐèYUs$Ð #Œl #Œ s

 M: µ1ÏÒqt H +þAF g:£¤$í`¦›¸ %i.

II. ÷mÇ ]Mö

YAG &ñ\ '‘)aTm3+ü< Ho3+_ 0lx•¸H yŒ•yŒ• 5.9 mol%ü< 1.5 mol%s. ìrF <Æ&h 8£¤&ñ“Ér—¸¿º 10 K\"f s

Ò#Q&’. #ŒlF g"鶓Ér Nd:YAG `O¼ YUs$_ ]j 2 ›¸

o (532 nm)–Ð *3iç #Œ %3Ér ©œ  Ґè YUs$

\

¦s6 x %i. 6 )a ҐèH DCMܼ–Ð"f ©œ #30H 630 nm\"f 660 nms 9 `O¼ ;Ÿ¤“Ér 5 nsÅÒlH 10 Hzs -231-

(2)

Õ

ªaË> 1. ©œ~½Ó„8Š —¸+þA, (a) ETU —¸+þA (b) STEP

—

¸+þA. ÕªaË>\"f ÏãÉr z´‚Ér #Œl F g\ _Ç #Œl\¦,

H z´‚Ér ©œ~½Ó„8Š +þAF g ~½Óئ`¦, ÓütÉr q~½Ó

„

s\¦  ·p. ÕªaË> (a)_ &hÉr ©œ ñs¢-a õ&ñ`¦



 ·p.

%

3. Ґè YUs$_ K©œ•¸H 0.002 nm &ñ•¸s. rÑ

\

 {9)a YUs$ c”Ér `O¼ \-t €• 10 mJs%3¼ 9 ú§4 E$™Ý¼–Ð f”â`¦ 1 mm s  ÷&> #Œ rÑ\¦ :

Ÿ

xõ > %i. rÑ\"f µ1ÏÒqÇ +þAF Ér E$™Ý¼–Ð —¸ 75 cm éߖҐoo ©œu\ ˜Ð?/ éߖҐoo ©œu_ ئ½¨\ Â҂ÃÌ÷&

#

Q e”H PMT\"f 7£x;Ÿ¤÷&%3. éߖҐoo ©œu_ {9¨ x9 Ø

¦½¨_ _þtaÅ@`¦ 200 m \P#Q +þAF gÛ¼&7˜àÔ!3 K©œ•¸ 570 nm\"f 0.22 nm ÷&> %i. PMT\"f :r ’ñH 300 MHznt_O š¸z´–ÐÛ¼ïáÔ\¦5g (ŽÓ'\ {94&

#

Q %ƒo x9 l2Ÿ¤÷&%3.

III. +sÇÊÝ õmÍ ÀXØ8ý

"

:r\"f ƒ/åÇ כ %ƒ!3 Ho3+ü< (¢¸H) Tm3+s '‘

)

aYAG &ñ_ +þAF g:£¤$í“ÉrtFKt #ŒQ |ÃÐ[þt\ _ K

 ƒ¨÷&%3. s[þt_ \¦ 7á+Ë  rF \"f

&

h %ò%is_ #¼ ïr0A\¦ #Œl 8¸ —¸¿º ©œ

~

½Ó„8Š +þAF g:£¤$í`¦ ?/%3. ‘:r ƒ¨\"¸ ©œ~½Ó„

¨8

Š +þAF g`¦›'1Ï %i¼ 9 ©œ~½Ó„8Š“Ér Ho3+ü< Tm3+ '‘

)aÓüt|9\"f +þAF g:£¤$í_ ÅÒכ¹ôÇ ‰&³©œe”`¦ ·ú˜ ú e”.



©œ~½Ó„8Š`¦ [O"î H {9øÍ&h ¿º —¸4Sq`¦ ÕªaË> 1\ ³ð r

 %i. ÕªaË> 1\"f (a)H ETU(energy transfer upcon- version)õ&ñ`¦ (b)H STEPõ&ñ(sequential two-photon excitation process)`¦ ·p.

Õ

ªaË>\"f ETU õ&ñ“Ér#ŒlF g\ _K ÅÒ>(donor) s

“

:rõ ~ÃÎ>(acceptor) s:rs {Œ•©œI 0\"f 2 ©œIÐ #Œ l

)a. ~ÃÎ> s:Érq~½Ó …;s&ñ`¦5g ׿çߖ©œI

“

 1 ©œI ÷ ÅÒ> s:r_ 2→0 „s< ~ÃÎ> s:r_ 1→3„s_ ©œ ñs¢-a(cross relaxation)ܼ–Ð ~ÃÎ> s:Ér

#

Œl©œI 3s ÷&#Q #Œl \-t ˜Ð H 3→0 „s\ _ ô

Ç ©œ~½Ó„8Š +þAF gs µ1ÏÒqÇ. s õ&ñ\"f ÅÒ> s:r

Õ

ªaË> 2. (a) Tm3+ü< Ho3+s:r_ \-t ïr0¸. (b) Ho3+(5F5) ïr0< Tm3+(3F2,3F3) ïr0A ÂÒH`¦ SX‰@Ç Õ

ªaË>.

“ É

r +þAF gs ™èY>(fluorescence quenching))a. ÅÒ> s:r õ

 ~ÃÎ> s:Ér ìøÍ×¼r 1lx{9Ç 7áxÀÓ_ s:r{9 €9¹H \O Ü

¼ ¿º s:rs “]XK e”#Q  9 {Œ•©œI\"f_ #Œ l

(0→2) \-t< ©œ ñs¢-aõ&ñ\"f \-t çߖs {9 u

 #Œ ôÇ. ÕªaË> 1(b)H STEP õ&ñ\"f #Œl F g\ _K s:rs {Œ•©œI 0\"f 2 ©œIÐ #Œl(ground state absorption, GSA))aÊê q~½Ó „s õ&ñ`¦5g s:r[þt s

 B>h ©œI(intermediate state) 1–Ð Ä»t|¨c M: 1lxr\ {9

)a¢¸ ÉrF g\ _K 8 ZÉr 3 ©œIÐ #Œl(excited state absorption, ESA)÷¦ 3→0 „s\ _Ç ©œ~½Ó„8Š +þ

AF g`¦ ~½ÓئôÇ. ETU õ&ñ\ _Ç 3→0 ©œ~½Ó„8Š +þAF g _ rߖ1lÉr š¸2£§ rߖ(rise time)õ yŒ™ûZ rߖ(decay time)ܼ–Ð sÒ#Qt 9 *3iç ïr0A 1, ׿çߖïr0A 2 x9 ~½Óئ ï

r0A 3_ ú"îrߖ\ _>Ç. STEP õ&ñ\"H éߖ{9 s

:rs ¿º F g\¦ 1lxr\ f¨Ãº #Œ {9#Q¼–Ð ©œ~½Ó„

¨8

Š +þAF g_ ú"îrߖ“Ér f”]X #Œl\ _Ç 3 ïr0A_ ú"î r

ߖõ °ú .

Õ

ªaË> 2H Tm3+ x9 Ho3+_ \-t ïr0¸s. ‘:r

ƒ

¨\"H Ґè YUs$Ð 630∼660 nm(15150∼15870 cm−1) %ò%i_ Tm3+_3F2 ïr0< Ho3+_ 5F5 ïr0A\¦

#

Œl %i. ÕªaË> 2(b)\ Tm3+_ 3F2 ïr0< Ho3+_

5F5 ïr0A\¦ ©œ[jy  ?/%3¼ 9, Ho3+(5F5) ïr0H 15457∼15744 cm−1 (635.16∼646.96 nm), Tm3+(3F2,

3F3) ïr0H 14659∼15438 cm−1(647.75∼682.17 nm) #3 0A\ 0Au ¦ e”. ÕªaË> 3“Ér Ho3+(5F5)ü< Tm3+(3F2)

(3)

ï

r0A\¦ yŒ•yŒ• 636.8 nmü< 648.7 nm YUs$Ð #Œl %i

`

¦M: ~½Óئ H +þAF gÛ¼&7˜àÔ!3s. ÕªaË>\"f 750 nm\

"

f 860 nmt ~½Ó„8Š +þAF g ü@\•¸ 350 nm\"f 580 nmt #Œl ©œ˜Ð ©œs Âúª“Ér ©œ~½Ó„8Š +þAF g`¦›'a

¹

1Ͻ+É Ãº e”. A\"f Kt yŒ• +þAF g\ @/6£x÷H „sH

³

ð 1\ ³ðr&#Q e”. Tm3+\¦#Œl %i`¦M: µ1ÏÒqÇ +þA

Õ

ªaË> 3. 10 K\"f 8£¤&ñôÇ YAG:Tm3+:Ho3+_ +þ

AF g ~½Óئ Û¼&7˜àÔ!3. ÕªaË>(a), (b) x9 (c)\"f 0H Tm3+_ 3F2 ïr0A (648. 7 nm)\¦ #Œl %i`¦ M: ~½Óئ Û

¼&7˜àÔ!3s¦ AH Ho3+_ 5F5 ïr0A (636.8 nm)\¦

#

Œl %i`¦M: ~½Óئۼ&7˜àÔ!3s. yŒ• x¼\ K{©œ H

„

s\¦ÕªaË>\ ³ðr %i.

³

ð 1. ÕªaË> 2_ ©œ~½Ó„8Š x9 ~½Ó„8Š_ yŒ• +þAF g\

@

/6£x÷H „s.

A Tm3+ 1D23H6 F Tm3+ 1D23H5

B Ho3+ 5G45I8 G1 Ho3+ 5F45I8

C Ho3+ 5G55I8 G2 Ho3+ 5S25I8

D Tm3+ 1D23H4 J Ho3+ 5S23H5

E Tm3+ 1G43H6 K Tm3+ 3F43H6

F

Ér Tm3+÷ߖ m Ho3++þAF g(G1, G2, J)•¸ Ÿí†<Ê÷&



HX< sH Tm3+\"f Ho3+–Ð_ \-t „ú˜`¦ _pÇ



. øÍtÐ Ho3+\¦ #Œl %i`¦M: Ho3+ +þAF r ëߖ



m \-t „ú˜\ _Ç Tm3++þAF g(A, K)•¸ ›'1ϝ)a



. #Œl"f Tm3+_ A, K „s< Ho3+_ G1, G2, J „ s

H Ho3+(5F5)ü< Tm3+(3F2) ïr0A ׿#Qn\¦#Œl 8



¸ +þAF gs µ1ÏÒqt H âĺs.

Õ

ªaË> 4HÕªaË> 3\ ³ðr)ayŒ• +þAF g`¦—¸m'aA "f Ґ

è YUs$_ ©œ`¦ or& 8£¤&ñôÇ #Œl Û¼&7˜àÔ!3 s

. D, E, F +þAF g\ @Ç #Œl Û¼&7˜àÔ!3ÉrÕªaË> 4(a)ü<

°

ú s Tm3+(3F2) ïr0ߖ  zŒ¤. Bü< C+þAF g_ #Œl Û¼

&

7˜àÔ!3Ér ÕªaË> 4(c)ü< °ú s Ho3+_ 5F5 ïr0ߖ Û¼&7˜àÔ

!

3\  ߖ. Õªo¦ A, G1, G2, J, K +þAF g_ #Œl Û¼

&

7˜àÔ!3(ÕªaË> 4(b))“Ér Tm3+ü< Ho3+s_ \-t „ú˜ M

H\ Tm3+(3F2)ü< Ho3+(5F5) ïr0A #Œl Û¼&7˜àÔ!3

\

 —¸¿º›'1ϝ)a.

~

½Óئ Û¼&7˜àÔ!3 #Œl Û¼&7˜àÔ!3_ ÐÂÒ' yŒ• +þA F

g_ ~½Óئ õ&ñõ \-t „ú˜ õ&ñ`¦ ìr$3 #Œ ÕªaË>

5\ ³ðr %i. ©œ~½Ó„8Š+þAF g [jl\ @Ç {9 YUs

Õ

ªaË> 4. 10 K\"f 8£¤&ñôÇ +þAF g_ #Œl Û¼&7˜àÔ!3.

(a) Tm3+ 1D23H4 „s\ K{©œ H D +þAF g_ #Œl Û

¼&7˜àÔ!3. (b) Tm3+ 3F43H6 „s\ K{©œ H K +þ

AF g_ #Œl Û¼&7˜àÔ!3. (C) Ho3+ 5G45I8 „s\ K

{©œ H B +þAF g_ #Œl Û¼&7˜àÔ!3.

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