TFU10NG . &~I HOC TONG HQP THANH PH6 HO CHi MINH
OIEU K'~N TO'
lfU VA THONG SO DONG D~NG
CUA MOT LO~I LASER HON HQ"P 2 KHI
QUANG HOC - 10218
TRAN . TUAN
"...,,
"
r-~-~'--'~'
ID~~~i;......-III ~ \ , ' ' I 1 .
; \"'d"_"'-"'" . " 1 , q,--"
.~
-~
THANH PHO Hb CHI MINH- 1986
16M TAT LUk.N AN PH6 TlEN sT KHOA HOC
-\
.
NgU'ai hU'ang don khoa hQc:
NGUYEN HO'U CHI, Pho Tien s7, Giao suo I.
CONG TRINH &UOC HOAN THANH.-'iAL~~~'~_d TRUONG e~1 HOC TONG HQP TP.- Hb--C.HrL- MINH-¥--'
NgU'ai nh{m xet 1 : &INH VAN HOANG, Tien s7, Giao suo I.
NgU'ai nh9n xet 2: T~ vAN TUAN,Pho Tien sT.
Co quan nh9n xet:
Phon vi~n Khoa hQc Vi~t Nam.
lu9n an se dU'gc boo v~ iQi H9i d6ng thOrn lu9n an Nha ""~at hQp tQi
vao hoi
nOm 1986. thang gia, ngay
Co th~ tim hi~u lu9n an tQi ThU'vj~n TrU'ang &Qi HQc T6n9 H9P Thanh ph6 Ho Chi Minh.
)0
"
.. A.-&~T
VAN 9t.
V9' Iy laser
'rang may chvc: nC'lmg~n day pha'
nhieu, nhU'ng"!u trung co th~ chia lam 2 lann vlfe:'
tri~n r6t
(i) Tim cae dge frU'ng d9ng hQe va d9C trU'ng khuech dQi e~a mol trU'o-nghoQt tinh.
(ii) Xae dinh d<;1ctrU'ng cuo quafrinh phat va nhi}ng dQC
trU'ng CUObCre XQ ph at d6i voi mo; trU'crng hoQt tlnh eho tnrac. VEin de thCr2, ph", thuge nhieu ve Iy thuyet h~ e9ng hU'ang, con van de thCr nhEit- moi trU'crng hoQt tfnh. a6i vai
dQng, nen
lu{tt dong
phon
cae
qui
Ian
.
Irong laser
laser khf, moi trU'o-ng hoQt tlnh thlfc chEif..la trQng thai plasma. Trong nhfrng ni]m gan day, vi~c nghien eCrucac thong 56 co ban cuo plasma d~ dieu khi~n eong suEit phaf da Ira nen quon trQng. Tuy nhien vi chU'a xac djnh dugc eong trinh deu du-ng IQi a duo-ng cong thlrc nghi~m voi cac thong 56 v9t Iy cho trU'crc, cua tu-ng vQch ph61 laser.
. Qui lu{1tdong dQng trong IrU'crng hgp t5ng quat
B.- N9\ DUNG lU~N AN. lu{tn an gom 3 pheln chu yeu. I - Phan t6ng quem t6ng kef co phon Hch nhi}ng c6ng frinn nghien cCruve mol trU'crng h09t Ifnh cuo laser khi, d~ lam co Sa eho vi~c kneo sat cae qua trinn co ban, eung nhU' Cae qua trinh d9ng hQe trong c{>tdU'O'ngplasma loser vai eac n9i dung sou:
rEit phCrc tQP va cO tn§ khong ton 1<;11,vi v{ly cong trinh nay tren co sa phon tfch cae qua trlnh can bang dl}ng hQc va nhi}ng qua trlnh co ban trong plasma ph6ng di~n khf d~ xae djnh b&ng Iy thuyet nhfrng thong s6 dong dQng eua loser khf, a dieu ki~n t6i U'u, trong do co ch~ kfch thfeh mCrc laser tren b&ng va ch<;tmkhong dim hoi 10Qi2 dong val fro chu yeu. nhi}ng gap Ket qua nh{1n dU'gc cuo cong trion nay khong tren, ma con thfen co chg hoQt d909 cuo 10Qi laser phon giai co th~ dung cae bi~u thll'C cua chung d~ xac dinh cac thong s6 v9t Iy trong che tQo cung nhU' Slr dvng.
2
- Tom hr
trinh kich thich ehu yeu trong moj trU'ong ho<;lttlnh cuo laser khf I qua trinh kich thich do va chQm di~n flr i va ehQm khong dan hoi 10Qi2 e9ng hU'ong, qua frinh chuy~n di~n tich va ion 1'100penning
- Phon tich Iy Ihuyet va Ihllc nghi~m v~ tiet di~n va chQm thich noi tq?m d6i vb' hoi cuo cac qua lrinh kkh khong dan Iaser hen hgp 2 khi.
- Khao sat ham phon b6 theo v{m toe cuo di~n
- Phon Ifch cac qua trinh 09ng hQc cuo laser He-Ne va ion hoi kim 10Qi o~ xac djnh co che kich thich chu y'u
tli va m9t so h~ qua quon trc;>ngcuo phU'ong trinh Boltzmann sur '9ng: phU'ong trInh can b&ng hQI, djnh lu{11 dong dQng va dong i il{ khutkh tan va d9 linh 09ng cuo hQt trong di~u ki~n khf Lorentz.
laser cuo cac mlrc laser tren va dU'ai.
I 1.- Phan Ihl{c hanh :
Boy la phan trQng tam cuo ban lu{1nvan. B&ngphon tich tong Irlnh da 11mdU'gc qui lu{1t d6ng dc;mg d{lc trU'ng toi U'u.N9i dung tren 0 che d9 phal Iy thuyet cho loQi laser khf noj nghien ClrUboo gom:
kfch thich mlrc laser tren:-
(I)
hOi 10Qi2 c9r.g hU'ong (L~) I. Phon loQi laser Iheo co the - laser vai va chQm knong dan
co ban,
siau ben, kfch thleh (mlrc laser
0 do A,B nguyen tli khf co ban va - khl-d~m i ky hi~u o,m,t tren), 6E - trQng thai bien dbi n9i nang cuo h~ .VI dV laser He.Ne co 3 "Qch ph6t chuy~n mlrc 352 - 3P4 ( ~390nm), 2s2 - 2p4 lU'ong lrng vai cac l1150nm)va 352- 2p4(632,8nm).
- Laser vbi va chQmion hoo Penning (loP).
+
(2)
Ao + 8m - Bo~ At +e;
Ao + 8m -+ At + Bo + 6E ;
~
+
+
+ . - m(rc ion kith thfch, vi dv trong laser a d6, At ion hO'ikim - Laser vai qua trlnll chuy~n di~n Hcll (L.C) loQi nhD'ng m(rc 3d'1 4s~ cuo InlI, 4d9 5s:l cua CdII / 6p cua SolI Ao + Bi - At + 80 + 6.E;
+
a do, Bi ion khf d~m a trQng thai cooban,
trong tr"ong hgp
+
+
(3)
nay At ntlm g(}n m(rc Bi / vi dv trong laser nhCi'ngm(rc thu9c nhom 3dl0 nx cua lnll 5s:l5p3 (200) cuo 10dIl.
,4dl0 ion hO'ikim 10Qi nx cua CdII,
2Phat tri~n Iy thuy~t Shottky vai
.,J,
tr"ong hgp tdng quat: H6n hgp n chol khi co chu Y cac 10Qi vo chQm ion hoa khat nIl" ion hoa tlrng b{lc, ion hoa Penning, chuy~n di~n tich v.v... .!lr dieu ki~n m{lt d9 nguyen tv sieu bell nm khong phI,' thu9c VQOban kinh r:
(4)
> 100
a do. IJm - xac xuot pha vcr nm do va chQmdi~n tv, Om -h~ so khua ch tan cua nguyen IV sieu ben, la nh{ln d"gc ph"O'ng trinh can btlng hQt mang di?n trong c9' d"O'ng plasma nIl" sau:
"
kT
~m~ --Dm
"--
e e
(5) (2/405)2 - R2 £kon.... ~k
Lk=1
a do; Zk ~k - v9n toe ion hoa va d9 linh d?ng cua ion khf k, a dieu ki~n plasma kh6ng co qua trlnh 2 bQCthl kef qua se trung '/aj Iy thuyat Sh~l!ky vai n = I, va trung vai Iy thuyet Dorgela vai n == 2.
3. NhQn d"9c dieu kj~n dang dQng cua plasma phong di~n
khi, khi co qua trlnh 2 b{1c.
.4
M9t
thong so v{lt Iy bot ky !rong laser khi deu phv thuge nhieu thong so khae. PhU'ong phap dong dc;mg eho to sop x~p so li~u 6y m9t each hgp Iy nhat, don gian nh6r. .Trong cae plasma ph6ng di~n Ihong thU'ong do c6 qui lu{lt dong dQng, ve dong, vai gia thi~t co ban la trU'ong th~ IQi 2 di~m tlTong Ilng dvng trong ph6ng di~n 10 b6t bien. Qui .Iu{lt d6 khong ap trU'ac dlTgc tho laser khf, vi 6 day phai c6 dinh nghTa khat tong su6t phat la bat bien.
Tli qui lu{lt nay do rut ra dU'gc :
ehQm - mQt
(61
CJ(= f (1;,Ne /P) a d6 CJ(- nOng lU'gng trung binh bj m6t do t6t co va cua dl~n Ilr, c - nOng lU'gng trung binh cua di~n tlr, Ne d9 di~n Ilr, p -ap su6t.
Tli h~ thlic (6) tho to kh&ng dinh rang, ngay co ktli di~n trlTong rut- gQn E/p giong nhau trong 2 ph6ng di~n, thi' v9n roC di~n Ilr chi bang nhau khi khong c6 qua trinh 2 b{lc:,' hay c6' qua Irinh 2 b{lc , nhU'ng Ne /p la dQi IlTgng b6t bf~n
4. Xu6t phat tli phU'ong Irinh d9ng hQc tong trinh do tim loQi cac thong so dong dQng cua dlTgc dieu ki~n toi U'u va laser khi n6i tren.
...
.
(7)
D,N= INt -
gt - Ncf) 9d
a d6, gt ' dd ' Nt ' Nd - trQng Iu-gngth6ng ke va mQt d9 don
01 M{li d9 dao 19n lei U-u(D,Nlopt Mal do dao Ion eua laser dU'oe xae dinh b6i:
.
so tlTong Ilng vai mile laser Nt ,Nd tren (t) va mile laser du-ai (d), dU'ge xae dinh tlic{lp phU'ong trinh v{ln toe, va bang:'
/
vr
tZmB-/Wgt
Nt = Ne NoA NoB \ Qom ve
) / BA ) \ Qt
eB (8)
5
, (9)
va) (Qilve)CGjA/Wgd
,Nd=N2eNoA(Q~t
.
tu- X tlr merc
.
.
If
e
so V{1:1toe kfch thfch merc ~a$er tre~ _,(f)do
, Wet ' Wgd ~ ,!x6'c,'su~t siam kfch thfCh eae' mc,e laser; ~iX - thai sian s6ng cua nguyen tu- X a mere i; . Q~X v )- hbng so v{1ntoc kfch thfch nguyen / \ i I~n merc i do va chQm di~n tu-, (p~A YT)-hbng
loQi 2,
va chQm khang dan hoi
Tu- di~u
ki~n ClfC trj va m{1t d9 di~n
tu-:
, (101
l) (,6,N) = 0 . -l)N
,'"
-
vai NoA ' NoS ~rTI{1t d9 khf eo bon (A) va khf d~m (8) a tr~mg thai co bon (0)
(" )
fa 'nh{in dirgc:
,
--
"
We I Blol'l= K~;-iJ):t(~R)~f~ ~A:T)-(QiA v.T( Qid' v.) k ,; )' ,.,
I
.
"\y ~d Wed (2,405)2DljA (Q~A VT) \Q~8ve) ---"
t<-tt _so ap suet rieng phbn; Dl'A -h~ so khuy~ch ton cila thai nO'ngIlTgngi,' a diau' kj~n chubn r = 273 K, la . 0, do, '" kM-A a ti'Qng P = I torr. N~u ham phon bo theo nOne IlTgng cua di~n IIi M..tixwellthi cae; h&ng so v{1ntoc kfch Jhfch va ion hoa ng~JY'~n ili la nhO'ng ham.o cud nhiet do dien t~ T ,do do (N ip ) t , "e e op
ehi thuge voo m9t dQi h'Q'ng duy nh6t 10 Te'
6
(Ne / p)opt = f (Tfit )
Thay (II) voo (7) to nh{m dl1Q'em9t d9 dao 19n toi
I1U:
K2
(f 2)
( A N R2)
W
-2
(K+I)
a d6,
2
e8
/ BA \ Qt
)
\ / .VT / \ Qm ve --
114)
Q (Te) =
\LQ:A VT)(QjA v.) (Qj: ve)
k
12,405)2W gd ' - (13) Q(Te) --- (Wgt)2 Dl' A - I - . opt -
laser
I1U.
b) Nhi~t d9 di~n tir t6i Tu- bi~u there (13), c6 th~ rut ra dl1ge 2 h~ qua quan trQng
.
IOU day:
I1U (LlN. R2)Opt
- 1/ Val K eho trU'ae m9t d9 dao 19n toi
Itlnh theo don vi 10 10,neu ham phon bo theo v9n toe cua di~n tir 10 Maxwell
lCR2)chi ph.,. thu9C voo me}tthong so duy nh6t thi
(13), (14) d6i vai vQch phat laser (L.R) (L.P). (' .CI Trong eae bi~u thlrC (II), i 10 mlrC sieu ben 1m); d6i vai eae vQeh ph at i 10 mlre eo ban ion (i).
ki~n;
- 2/ Nhi~t de} di~n tir (Ta )opt dU'Q'cxac dinh tu-dieu
2
\
thong so d6 10 Te .
(-
(I-')
.t~- (~iA v.) (Q~Av.) \ - 0
. b \ / aB ) \Qm Va
7
Trang bi~t.lth(re (15! cae h&l1g$0 v{m t6e chi phv thu9c veo cae hang so dC}c tnrng eho loQi kIll nhU' Vi ' Vm' Vd' VI v{1y n9hi~m tOng quat cua phU'ong trinh (15) c6 dc;mg.
t6i U'u
(16) (Te 'opt = f (Vi' Vm I Vd )
'-- Vai laser (loR)
(T~)~pt
' +[2(V 2 IS -Vlsk ) - (V2P. + Visk ) +
~ [2(V2 IS - Visk ) - (V2p4 1 V'Sk)J2+ 16(2V21S-V2p4)
(1/2
(17)
Tli (15) 'to nh{1n dU'ge bj~u there CliO nhi~1 d9 di~n tll ITe )opt trong 3 trU'cmghgp .
J
- Vai laser
ITe )opt = -i~ [2 (V2' So-ViM)-v d + ~[2(V23S,-ViM)- Vd]2
Visk ) (loP)
+ 10 (2V235 - Vd)ViM~
(L.C)
- - Va; laser
(18) ~1/2 ] B
2A + (190) 11f2I (19) (19b) . Ire lopt = - 2reos 3
a..cf6r =- + I -3.~~A: B2 (1ge) 27A3 ~ 3A2 + -A I
q = 2- BC D ] 8 v6i AI 8, C, D la eae ham so cua cae hong so nguyentli,
Vi' Vm, Vdl Vi
9ay \a dQi Iu-gng bat bien co bon nhat. vi tlr do co th~ XQ-C
dinh cae dQi Iu-gngbat bien khat. Tlr (161va (121cho ta : suy ra r6n; tlr (17.19) (T.) opt = conlt. (Ne / P)opt = const, (201 cJ TI so ap suet ri€mg phon Kopt. khf a
9ay la dQi Iu-gng bat bien thCr2 nh{1Odu-gc trong lo..r
the dt} phat
tal u-u. 9Qi Iu-gng bat bien nay kh&ng dinh rbng,
m9c du trong laler khl co ton fQi qua trinh 2 b{lc, qui lu{lt dong
dQng van fhoo man.
- (211 NA + = NS + 9ieu ki~n t6i u-u cua h~ so Kopt du-gc vH~tra tlr dOng thCre: - V6i laser (LR): ado NA + , NB + la ndng dt} ion khf COban (AI va khf d~m-
cualase,r. ClIng vai phu-ong t,in-h
(B) trong ct}t Gu-ong plalma
can b6ng hQt ta nh{ln du-gc bi~u there cua Ii .0 ap .uat
rleng
phon toi u-u Kopt: !-L° J-~ [ ZO~. w. K opt 2 ~,oBB + ~(loA . !-LG~!\_-- - t ZO ZO
B !-L°B~ -
fLo
AA ~ °
<~A AA B ] fLOB~ )2 + 4 loA . !-L°BB/12 fJ-°AA ~ J-L°BA loB (22) 9 loler (loP) : - Val lOA Kopt = ZomB zo - (23) °
/L AB -
B /LoBB ~ laser ll.C) : - Vai 0 K + = (24) ~,oBB
--
'nO Zoe
zo opt /L0B~ ) I - (I + k
p lOA
-.
Zo
B ~, AB AB B Trong cae bi~u there (22. 24) ky hi~u zo la v{m toe cuo qua
trinn ion h60 a dieu ki'~n chuan IT = 273K, p = I Torr), ""':13la d9 linh d9ng eua ion (X trong khi 13a dieu ki~n chuan.
rieng phdn cuo laser khi' 2 chat chi phI,!
NhlT v{ly, ti 10 ap luat
thu9c VaG I dQi IlTgng duy nhat 10 (Te) opt. N61 each knae, 125) (K)opt 10 I dQi IlTgng bat bien: Kopt = eonlt. lTU(PR)opt dl Th8ng so dong dQng tal
Tu- phlTang trinh con baug di~n lich trang cQt dlTanl
cua h5n hgp khi (5), ap dvng dieu ki~n foi lTU(21), to laser (loR): . - .Vai 1/2
(PR)opt = 2,405 (T.) opt T n
(K + I) 273- plalma
nh{ln dlTge thong so dong dQng toi lTU(PR)opt : 10 ,1/2 (26) 0 0 ] ' /LBA IJ-BB - V6i laser (LP) : 1/2 (27) . 273 IJ-~B ] opt
2Zo
B (PR)opt = 2,405. Tn [ (T.) .. - V6i laser ° 1/2 (L.C): (28) (PR)opt = 2,405. T -~~~~_~et
0-
.1
o
2(Z
B - K Zc ~--
! .! NhU' v9Y, (PR)opt cDng 10 m9t dQI lU'gng bot bien: (29) ' (PR)opt = f IT. ) opl 273 el Dong phong di~n loj U'U: R eo dQng : Dong phong di~n trong c9t dU'ong plasma v6i ban kfnh (30) J = 2J(e~'e E J~ rNe (r) dr ; fL. - a do, N. - nong d9 di~n Ill' Iren trve c9t dU'ong,
linh d9ng cuo di~n tll', E -
TII (30 eta rut ra dU'go: . (31) d9.
di~n trU'ang tren trve c9t dU'ong. (J/R)ept = CX~2A-~o (A-eo v. ) G (Te) !PR)~pt ; ;"i:-:,-:",'~~"'.'--,',~:~,'1 II 1~~~"__.\~~~~"~;'..,'..~.'.'L'.\
I
!
!
L-:r "';;1 .
t
;
"._1 -1 ; v6'i C = IA gt 1,36 (~r/4 . Q Q v ve m T t ) ( BA . )( eB GITe) = (L Q:AvT ) (Q~A ve) ( Q~A Ve) ; .. k h! do trung binh cuo di~n hi khoong duang a do X. - ph?!nn{jng hrgng cua di~n hi bj mat do va chQm,
trong c9t
A.eo -
dU'ong v6'i ap suet p = I torr, Tn ::c 273K. NhU' v9Y, IJjR)opt chi phV thu9C VaG (Te ) opt. Noi cach khat IJjR)opt . gd gt Wgd W (D. ) la I dQi lU'gng bat bien § 5. So sanh Iy thuyet nh9n dugc voi thllc nhi~m SiT dvng cac bi~u thllc da Jim ra trong § 4 d~ tinh nhi~1
rieng ph?!n toi U'U
ti so ap suet toj uu (Te ) opt' d9 di~n hi Kopt ' thong so dong dQng (PR)opt , va dang phong di~n to; U'u trong tlrng trU'ang hgp cv th~ cuo m9t so vQch phat Jopt'
IOU day: (i) voi (l.R) vQch ,hat dugc khoo aat la 632,8nm loa.r
(352-2p4) cua loa.r H. -N.. laser (ii) v6'i dugc khao sat la
(L P) cae vQch phat
441,6nm 15a22Ds/2-5p1 Ps/2)' 325,Onm (5S22DS/2-5p2 Pll2) cuo
laser He - Cd, 747,8nm 14.2:1Dsl2-4p2 Ps/2)' 589,4nrri
(4522 Dsl2-
4p2 P1i2) cua laser H. - In, 684,4nm (6p2 P1/2- 6.2 51/2) va
645,3nm (6p2 Psl2-6v 51/2) cua las.r He -So. la
758,8nm (5p2 P'Ih - 55:1Sl/:JJ cua lo..r H. -In, 522,7nm (5p4 (iii) voi laser (l.C) cae vQch poot dU'gc khao sat 12 , ,t 7,~~,n' b~,j8} - ' , '0
. cua laser tte-J~~/9~:~!5,IJm(99~85312-835771/2)cua laser Ne-Te
(61p3 D2t- 61 S3DO), 576,Onm (61 p3 D2 - 61 S3 Do) 2. . 7 )cua laser He,,"!". ' 2 ., c!lffh~' dU'gctrlnh bay trong' bqn lu{1n vOn. :: a559~5/:1) '.0°,',:".014P5f':!)cua4ase'r?He-S~,
'J" 507,8nm (103.106°,
<,72 ,NH~N XET KET QU';;: va 504,7n~
Ci"I;};""":"":',~/"'-~"
612t7,nrn.{61p3)Pi~-,61,s8P
"
, Ket que
.,":,' 1/ Sosanh ket qua tinh loan Iy Ihuyet(th~o :22.,:":,24/26,~ 28;'31) va cac gia trj (loR) (i), laser cac bi~u thCrc
17'~19j,
Ihl{C nghi~m
hheo' c&-c cQng"I'rinhdadlTOC cong bolren nhi~u tgp chi khac
!Klopt ' (PR) opt
nhau) cutf'26c 'th'&'ng's6>cto.ngdQng de) opt'
(loP)
laser
tlTong Crr)gvai cac vQch phat
va (Jlopt
Iii) va laser
(loCI (iii), to thay rang, co 51{phu hgp kha tot giiia
Iy thuyet va Ih'lc nghi~m. TCrcac ket qua nay hoan loan tho
10 kh&ng ~inh rang, 5 thong so dongdQng Iren la dung. 2/Trohg5 thongso;d9r'19 thong so (Te) opt
la
dQng tren,
q\j'an trQ'rignhal.TCr cae bi~u thCr, (19-21)
sur ra r&ng, (Te) opt
chi ph"" thu?c vao nOng IlTgng cac mCre cuo khf tro va hoi kim
JoQi day la nhii'1g dQi IlTgng da dU'ge khao sat chfnh xae, do
'~o ITe) opt 16 dang"ti:h C9Y. Hon niJa, bi~u IhCrc(Te) opt nh9n
'dlTgc Ill' el{CIri cue, (!,5L trong do chung khong ph\) Ihu9C VCfO
gia frj tuy~t do; CUOcac' h&ng so v9n foe, ma chi phI} thu9C
vao dQng,dlTong.cong"d'6ng tin c9y'cua '-chung. (loC):"dongphong ciia~'cac vQch phat'laser ~oi v6i >c:a'~vQ'th;'P't1C5floser
Ian hon lopf .~" , ' ,:::':"'rn 'L (LC) ,nhe') hon Ic1ser (l~RIva laser di~n Jop:"
IloR( va (loP), nen
fro,Iqvan trQng. Do d6
(loP) \6 cuo laser Y;6;i\P~)opr p'(L9iqJ)"h:r:~~ dU'ge m9,t so- h&hg ,so nguyen I";, cub rat
,.qUo trlnh l.;ng,.,b{1c..9"i'Pt5y d6ng val
(Te) opt
h,gply.
j ", 3/ Nho co di,~u kj~-{btoj U'u( K)opt i' neri';cac bi~u thCrc do; chung fa de dang tinh dtlgc " I
I hO'i kim loQi (den nay con chtla dtlgc nghien Cll'U day au),
thong so
chinh dieu nay tho phep
(PR)opt d6i v6i baf ky laser He - M va N. - M.
4/ Thong s6 dong dQng (J/R) hay tNe/p) 13 cua laser ion hO'i
kim loQi da dtlgc s,p sanh gili'a Iy rhuye! va thY'c nghi~m CUI;)
g1o ~h6'c nha.u d6i v6i vQch phat He --, Cd (l.P) va
nhieu tat
(loCI. SY'phu hgp co ve quy lu{u bien obi, co ve
laser H~-I
gia Irj tuy~t d6i cua !hong s6 dong dQng (J/R) chll'ng 10 rang,
Ne/p nh~andtl<1c Ill' Iy huyella hoan loanphu -hgp. 51 6 che, d9 phal 'tlO'l1g(rng v6i dong phaog di~n nho,Jhl dieu ki~n (4) sa bj vi phQI11 16n. &ieu d6 tho ta doan" nh{jn
rang, a day se khong ton tQi cac thong 56 dong dQng. III KET LU';N. II Xuat phat "" '" " . ki~n tong suaf phot toi U'U,va fll'gill thiet (.~N, R2jopf = cons!'
mch da eMnden cac thong s6 dong dQrig (TeJopt ,"(PRIopt,
INe/p ) opt va (J/R) opt. fll' phU'O'ng frinh d9ng hQc cua laser adieu Hai thong s6 dong dQng (N e/P) opt va (J/R) "opt khat v6i
cac thong 56 dong dQng tU'O'ng(rng trong c9t dtlO'ng thong
fhU'ang la Ne I p2 va J (nh{jn dU'gc tll' gio thiet V ==const). 2/ S,! phil hgp gili'a Iy thuyet va thY'c nghi~m v6i nhiiu tat gill khat nhau d6i v6i vQch phat khat nhau ch(rng to rang: a) Quy lu{jf dOng dQng a fren la dung. b) NhiJ'ng qua frinh djch chuy~n chu yeu d~ tQo moi trU'ong dllo 19n ache d9 phaf foi U'Ula hgp lye cl M9C du cac qua frinh kith thich mang tinh chat fling b{jc,
nhtlng fhoa man dieu ki~n INe/P) = const, nen thoa man dieu
ph6ng di~n khi'
ki,n dQng (hinh hQc) trong plasma dong 14 3/ &i~u 1I1,n co ban d~ tong suet phat C,!CdQi 10 nhi,td9 )-- 1 di,n tlr phai thoa man h, thlic: mB iA d (V + C) + 5 [2 tV _v
t ;A mB d) ~ -(V + c)]2 + bV (2V -V ) ~1/3 ] ad6, a = -~; b "= 16,c = V doi vai laser lL. It), ITe ) opt'" mB iA a [2 (V -V laser (L.P), va a = I, b = 10, C = 0 doi vai
10 h09C : (Te ) opt >= - 2 rcos .!. + ~- doi vai laser (L.C) 3 A Tu-thong so (Te )opt c6 th~ tinh d"Qc cae thong 16dbng dQng eon IQi. 8 ;A 4/ Cae biiu thlic IK)opt ' (PR)opt ! va Jopt e6 thi thay th' cho hang 10QIcf\Tang (ong th'!e nghi,m cti rim chi! d9 phat 16i
"U. Bay la van d~ e6 y nghTa Ian trol~ thye riA" ling dvng va
thi~t k~ eae loQilaser. 15 I- &ieu ki~n toi U'uva .hong s6 dong d(;mg t6i U'u cua laser N9i dung chu yeu cua lu{ln an da cong be tl'ong cac cong trinh
sou day: He - Ne v6i vQch phat 632,8nm. Thong boo khoa hQc TrU'cmg
BQi HQc T6ng Hgp Thanh pho Ho chi Minh, so 5 1986 2- &ieu ki~n t6i U'u va thong s6 dong dQng cua laser co cO' rQp chi V{lt l'1, Yi~n Khoa che kkh thfch ion hoa Penning.
hQc Vi~t Nom s6 4, 1985. 3- St[ phan b6 nong di) cac hQt mang di~n theo tiet di~n
ngang cua m9t hen hgp nhieu khf. TQp chi V{lt L'1' Vi~n
Khoa hQc Vi~t Nam s6 " 1986 5- Optimum conditions and similarity parameters of metal mechanisms by charge- ion lasers with excitation
collisions Thong bao Khoa hQc TrU'ong &Qi HQc vapour
transfer
TOng Hgp Thanh ph6 ria chi Minh, s6 6, 19C\6. 4- &ieu ki~n t6i U'uva Ihong s6 dong dQn~ cua laser He-Hg.
TQP chi V{lt 1'1, Vi~n Khoa hQc Vi~t NJm (da nh{ln dOng) 6- About similarity parameters of gas lasers Thong bao Khoa
hQc TrU'cmg&Qi HQc TOng tigp Thanh ph6 He>chi Minh, s6
6, 1986.[ 2B3
[2Z~ (K:I /L~A + K/L~B)
