Luận án phó tiến sỹ " Điều kiện tối ưu và thông số đồng dạng của một loại laser hỗn hợp 2 khí " docx

TFU10NG . &~I HOC TONG HQP THANH PH6 HO CHi MINH
TRAN .TUAN
OIEU K'~N TO' lfU VA THONG SO DONG D~NG
CUA MOT LO~I LASER HON HQ"P 2 KHI
QUANG HOC- 10218
16M TATLUk.NAN PH6 TlEN sT KHOA HOC
ID~~~i; III
\"'d"_"'-"'" " " ,, ~ \
; ,
. '
" '
1 I
, 1
q, " .~ r-~-~' '~' .
-~
THANH PHO Hb CHI MINH- 1986
.
-\
CONG TRINH &UOC HOAN THANH 'iAL~~~'~_d
TRUONG e~1 HOC TONG HQP TP Hb C.HrL- MINH-¥ '
NgU'ai hU'ang don khoa hQc:
NGUYEN HO'U CHI, Pho Tien s7, Giao suo I.
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
gia, ngay
thang
nOm 1986.
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' tri~n r6t
nhieu, nhU'ng"!u trung co th~ chia lam 2 lann vlfe:'
(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 XQphat d6i voi mo; trU'crnghoQt 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 laser khf, moi trU'o-nghoQt tlnh thlfc chEif la trQng
thai plasma. Trong nhfrng ni]m gan day, vi~c nghien eCrucac
thong 56 co ban cuo plasma Irong laser d~ dieu khi~n eong
suEit phaf da Ira nen quon trQng. Tuy nhien vi chU'a xac djnh
dugc qui lu{tt dong dQng, nen phon Ian cae 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 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.
Ket qua nh{1n dU'gc cuo cong trion nay khong nhi}ng gap
phon giai thfen co chg hoQt d909 cuo 10Qilaser tren, ma con
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.
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:
2
- Tom hr<?,e cae qua 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
khong dan hoi cuo cac qua lrinh kkh thich noi tq?md6i vb'
Iaser hen hgp 2 khi.
- Khao sat ham phon b6 theo v{m toe cuo di~n tli va
m9t so h~ qua quon trc;>ngcuo phU'ong trinh Boltzmann sur
'9ng: phU'ong trInh can b&ng hQI, djnh lu{11dong dQng va
dong i il{ khutkh tan va d9 linh 09ng cuo hQt trong di~u ki~n
khf Lorentz.
- Phon Ifch cac qua trinh 09ng hQc cuo laser He-Ne va
laser ion hoi kim 10Qi o~ xac djnh co che kich thich chu y'u
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

Iy thuyet tong Irlnh da 11mdU'gc qui lu{1td6ng dc;mg d{lc trU'ng
cho loQi laser khf noj tren 0 che d9 phal toi U'u.N9i dung
nghien ClrUboo gom:
I. Phon loQi laser Iheo co the
- laser vai va chQm knong dan
kfch thich mlrc laser tren:-
hOi10Qi2 c9r.g hU'ong (L~)
Ao + 8m -+ At + Bo + 6E
;
(I)
0 do A,B nguyen tli khf co ban va -khl-d~m i ky hi~u o,m,t
trQng thai co ban, siau ben, kfch thleh (mlrc laser tren), 6E -
bien dbi n9i nang cuo h~ .VI dV laser He.Ne co 3 "Qch ph6t
lU'ong lrng vai cac chuy~n mlrc 352 - 3P4 ( ~390nm), 2s2 - 2p4
l1150nm)va 352- 2p4(632,8nm).
- Laser vbi va chQmion hoo Penning (loP).
+
Ao + 8m - Bo~ At +e;
(2)
~
. +
a d6, At - m(rc ion kith thfch, vi dv trong laser ion hO'ikim
loQi nhD'ng m(rc 3d'14s~ cuo InlI, 4d9 5s:l cua CdII / 6p cua SolI
- Laser vai qua trlnll chuy~n di~n Hcll (L.C)
+ +
Ao + Bi -At + 80 + 6.E;
(3)
+
a do, Bi ion khf d~m a trQng thai cooban, trong tr"ong hgp
+ +

nay At ntlm g(}n m(rc Bi / vi dv trong laser ion hO'ikim 10Qi
nhCi'ngm(rc thu9c nhom 3dl0 nx cua lnll ,4dl0 nx cua CdII,
5s:l5p3 (200) cuo 10dIl.
2Phat tri~n Iy thuy~t Shottky vai 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:
.,J,
~m~
Dm
> 100
(4)
a do. IJm - xac xuot pha vcrnm do va chQmdi~n tv, Om -h~
so khua ch tan cua nguyen IVsieu ben, la nh{ln d"gc ph"O'ng
trinh can btlng hQt mang di?n trong c9' d"O'ng plasma nIl" sau:
"
£k
on
~k
(2/405)2
" - R2
kT
e
e
(5)
L
k=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 Iythuyet
Dorgela vai n == 2.
3. NhQnd"9c dieu kj~ndang 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
cae so li~u 6y m9t each hgp Iy nhat, don gian nh6r. .Trong
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
trong ph6ng di~n 10 b6t bien. Qui .Iu{lt d6 khong ap dvng
dlTgc tho laser khf, vi 6 day phai c6 dinh nghTa khat trU'ac
tong su6t phat la bat bien.
Tli qui lu{lt nay do rut ra dU'gc :
CJ(= f (1;,Ne /P)
(61
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
dlTgc dieu ki~n toi U'u va cac thong so dong dQng cua loQi
laser khi n6i tren.
01 M{li d9 dao 19n lei U-u(D,Nlopt
Mal do dao Ion eua laser dU'oe xae dinh b6i:

.
ehQm
- mQt
gt
D,N= INt - - Ncf)
9d
(7)
a d6, gt ' dd ' Nt ' Nd -trQng Iu-gngth6ng ke va mQt d9 don
so tlTong Ilng vai mile laser tren (t) va mile laser du-ai (d),
Nt ,Nd dU'ge xae dinh tlic{lp phU'ong trinh v{ln toe, va bang:'
/ eB
)
/ BA
)
.
Nt =Ne NoA NoB \Qom ve \Qt vr tZmB-/Wgt
(8)
5
,Nd=N2eNoA(Q~t
va) (Qilve)CGjA/Wgd
vai NoA ' NoS ~rTI{1t d9 khf eo bon (A) va khf d~m (8) a tr~mg
thai co bon (0) .
, Wet ' Wgd ~,!x6'c,'su~t siam kfch thfCh eae' mc,e laser;
~iX - thai sian s6ng cua nguyen tu-Xa mere i;
/
.
. Q~X v
)
- hbng so v{1ntoc kfch thfch nguyen tu- X tlr merc
\ If e .

i I~n merc i do va chQm di~n tu-,
(p~A YT)-hbng so V{1:1toe kfch thfch merc ~a$er tre~ _,(f)do
, (9)
va chQm khang dan hoi loQi 2,
Tu- di~u ki~n ClfC trj va m{1t d9 di~n tu-:
l) (,6,N)
= 0
-l)N
.
, (101
,'" -
fa 'nh{in dirgc:
(" )
"\y ~d Wed (2,405)2DljA (Q~A VT) \Q~8ve)
, "
We I Blol'l= K~;-iJ):t(~R)~f~ ~A:T)-(QiA v.T( Qid' v.)
k
,., ,; )'
"
0, do, t<-tt _soap suet rieng phbn; Dl'A -h~ so khuy~ch ton cila
'" I .
kM-A a ti'Qng thai nO'ngIlTgngi,'a diau' kj~n chubn r = 273 K,
P = I torr. N~u ham phon bo theo nOne IlTgng cua di~n IIi la
M tixwellthi cae; h&ng
so v{1ntoc kfch Jhfch va ion hoa ng~JY'~n
ili la nhO'n
g
ham.o cud nhiet do dien t~ T ,do do (N
ip
)

t
.
, "e e op
6
ehi thuge voo m9t dQi h'Q'ng duy nh6t 10 Te'
(Ne / p)opt = f (Tfit )
(f 2)
Thay (II) voo (7) to nh{m dl1Q'em9t d9 dao 19n toi I1U:
12,405)2W gd ' K2
(
A
N R
2
)
- - Dl'
A
- Q(T
e
)
W . opt - -2 (Wgt)2 I (K+I)
(13)
a d6,
/ BA \ / e8
)
2
\Qt .VT / \Qm ve

\LQ:A VT)(QjA v.) (Qj: ve)
k
Trong eae bi~u thlrC (II), (13), (14)d6i vai vQch phat laser (L.R)

i 10 mlrC sieu ben 1m);d6i vai eae vQeh phat laser (L.P). (' .CI
i 10 mlre eo ban ion (i).
b) Nhi~t d9 di~n tir t6i I1U.
Tu- bi~u there (13), c6 th~ rut ra dl1ge 2 h~ qua quan trQng
IOU day: .
- 1/ Val K eho trU'ae m9t d9 dao 19n toi I1U (LlN. R2)Opt
Itlnh theo don vi lCR2)chi ph.,. thu9C voo me}tthong so duy nh6t
10 10,neu ham phon bo theo v9n toe cua di~n tir 10 Maxwell thi
thong so d6 10Te .
- 2/ Nhi~t de}di~n tir (Ta )opt dU'Q'cxac dinh tu-dieu ki~n;
Q (Te) =
114)
. / aB
)
2 \
b \ \Qm Va (-
.t~- (~iA v.) (Q~Av.) \ - 0
(I-')
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.
(Te 'opt
= f (Vi' Vm I Vd ) (16)
Tli
(15) 'to nh{1n dU'ge bj~u there CliO nhi~1 d9 di~n tll t6i U'u
ITe )opt trong 3 trU'cmghgp .
' 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
J
Visk ) (17)
- Vai laser (loP)
ITe )opt = -i~ [2 (V2' So-ViM)-v d + ~[2(V23S,-ViM)- Vd]2
~1/2
]
+ 10(2V235 -Vd)ViM~ (18)
- - Va; laser (L.C)
<P B
Ire lopt = - 2reos 3 + 2A
(19)
a cf6r
=- + I -3.~~A: B2 11f2
I
(190)
<P
= arc cas (q/r3)
(19b)
(1ge)
. I
[
2B3 BC D
]
q = 2- 27A3 ~ 3A2 + -A
8
v6i AI 8, C, D la eae ham so cua cae hong so nguyentli,
Vi' Vm, Vdl Vi tlr (17.19) suy ra r6n; (T.) opt = conlt.
9ay \a dQi Iu-gngbat bien co bon nhat. vi tlr do co th~ XQ-C
dinh cae dQi Iu-gngbat bien khat. Tlr (161va (121cho ta :

(Ne / P)opt = const,
(201
9ay la dQi Iu-gng bat bien thCr2 nh{1Odu-gc trong lo r khf a
the dt} phat tal u-u. 9Qi Iu-gng bat bien nay kh&ng dinh rbng,
m9c du trong laler khl co ton fQiqua trinh 2 b{lc, qui lu{lt dong
dQngvan fhoo man. -
cJ TIso ap suet ri€mgphon Kopt.
9ieu ki~n t6i u-u cua h~ so Kopt du-gc vH~tra tlr dOng thCre:
NA+ = NS +
(211
ado NA + , NB + la ndng dt} ion khf COban (AI va khf d~m-
(B) trong ct}t Gu-ong plalma cualase,r. ClIng vai phu-ong t,in-h
can b6ng hQt ta nh{ln du-gc bi~u there cua Ii .0 ap .uat rleng
phon toi u-u Kopt:
- V6ilaser (LR):
K w. J-~
[
ZO~. !-L°B~ - ~,oBB + ~
(
loA . !-LG~!\_
opt 2 ZO fLo ~° - t ZO !-L°
B AA <~A B AA
fLOB~
)
2 + 4 loA . !-L°BB/12
]
J-L°BA loB fJ-°AA ~
(22)
9
- Val loler (loP) :

Kopt =
lOA
°
/L AB - k ZomB
zo - p
B /LoBB
(23)
~
- Vai laser ll.C) :
lOA ~,oBB Zoe
K = + -
(
I +
opt Zo 'nO zo
B AB B
0
/L0B~ ) I
~, AB
(24)
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.
NhlT v{ly, ti 10 ap luat rieng phdn cuo laser khi' 2 chat chi phI,!
thu9c VaG I dQi IlTgng duy nhat 10 (Te) opt. N61 each knae,
(K)opt 10 I dQi IlTgng bat bien:
Kopt
= eonlt.
125)
dl Th8ng so dong dQng tal lTU(PR)opt

Tu- phlTang trinh con baug di~n lich trang cQt dlTanl
plalma cua h5n hgp khi (5), ap dvng dieu ki~n foi lTU(21), to
nh{ln dlTge thong so dong dQng toi lTU(PR)opt :
. - .Vai laser (loR):
1/2 T n
(PR)opt = 2,405(T.) opt (K + I) 273-
10
[
2Z~ (K:I /L~A + K/L~B)
]
,1/2
0 0 '
/LBA IJ-BB
(26)
- V6i laser (LP) :
(PR)opt = 2,405. Tn
[
(T.) opt IJ-~B
]
1/2
273 2Zo .
B
(27)
- V6i laser (L.C):
T
!
°
(PR)opt
= 2,405. ~ -~~~~_~et
.!

1/2
273
2(Z
o .1 0-
B- K Z
c
(28)
NhU' v9Y, (PR)opt cDng 10 m9t dQI lU'gng bot bien:
(PR)opt = f IT. ) opl '
(29)
el Dong phong di~n loj U'U:
Dong phong di~n trong c9t dU'ong plasma v6i ban kfnh
R eo dQng :
J = 2J(e~'e E J~ rNe (r) dr ;
(30)
a do, N. - nong d9 di~n Ill' Iren trve c9t dU'ong, fL. - d9.
linh d9ng cuo di~n tll', E - di~n trU'ang tren trve c9t dU'ong.
TII (30 eta rut ra dU'go:
(J/R)ept
= CX~2A-~o (A-eo v. ) G (Te) !PR)~pt ;
(31) .
v6'i C = 1,36 (~r/4
;"i:-:,-:",'~~"'.' ,',~:~,'1
1~~~"__.\~~~~"~;' ,' ~.'.'L'.\
I .
! t
! ;
-1 L-:r "';;1 "._1
. gd gt W
g

d W
(
D.
)
;
gt IA
II
GITe) =
.
(
BA .
)(
eB
)
Q v Q ve
t T m
(L Q:AvT ) (Q~A ve)( Q~A Ve);
k
a do X. - ph?!nn{jng hrgng cua di~n hi bj mat do va chQm,
A.eo - khoong duang h! do trung binh cuo di~n hi trong c9t
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 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
d9 di~n hi toj uu (Te ) opt' ti so ap suet rieng ph?!n toi U'U
Kopt ' thong so dong dQng (PR)opt , va dang phong di~n to; U'u
Jopt' trong tlrng trU'ang hgp cv th~ cuo m9t so vQch phat
IOU day:
(i) voi loa.r (l.R) vQch ,hat dugc khoo aat la 632,8nm

(352
-2p4) cua loa.r H. -N
(ii) v6'i laser (L P) cae vQch phat dugc khao sat la
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.
(iii) voi laser (l.C) cae vQch poot dU'gc
khaosat la
758,8nm (5p2 P'Ih - 55:1Sl/:JJ cua lo r H. -In, 522,7nm (5p4
12
'.0°,',:".014P5f':!)cua4ase'r?He-S~, 507,8nm (103.106°, :: a559~5/:1)
, 7,~~,n' ,t 'J" - b~,j8} '0 ' <,72
. cua laser tte-J~~/9~:~!5,IJm(99~85312-835771/2)cua laser Ne-Te
va 504,7n~ (61p3 D2t- 61S3DO), 576,Onm (61 p3 D2 -61 S3Do) ,
Ci"I;};""":"":',~/"'-~" 2. . 7
612t7,nrn.{61p3)Pi~-,61,s8P )cua laser He,,"!". '
., " 2
, Ket que c!lffh~' dU'gctrlnh bay trong' bqn lu{1n vOn.
.,":,'
,NH~N XET KET QU';;:
1/ Sosanh ket qua tinh loan Iy Ihuyet(th~o cac bi~u thCrc
17'~19j, :22.,:":,24/26,~ 28;'31) va cac gia trj Ihl{C nghi~m
hheo' c&-c cQng"I'rinhdadlTOC cong bolren nhi~u tgp chi khac
nhau) cutf'26c 'th'&'ng's6>cto.ngdQng de) opt' !Klopt' (PR) opt
va (Jlopt tlTong Crr)gvai cac vQch phat laser (loR) (i), laser (loP)
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 dQng tren, thong so (Te) opt la
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 mCrecuo 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.
~oi v6i >c:a'~vQ'th;'P't1C5floser (loC):"dongphong di~n Jop:"
rat Ian hon lopf ciia~'cac vQch phat'laser IloR( va (loP), nen
,.qUo trlnh l.;ng,.,b{1c 9"i'Pt5y d6ng val fro,Iqvan trQng. Do d6
(Te) opt cuo laser (LC) ,nhe') hon Ic1ser (l~RIva laser (loP) \6
h,gply.
, ,:::':"'rn 'L ' .~"
j ", 3/ Nho co di,~u kj~-{btoj U'u( K)opt i' neri';cac bi~u thCrcdo;
Y;6;i\P~)opr p'(L9iqJ)"h:r:~~ dU'ge m9,t so- h&hg ,so nguyen I";,cub
13
hO'i kim loQi (den nay con chtla dtlgc nghien Cll'U day au),
chinh dieu nay tho phep chung fa de dang tinh dtlgc thong so
(PR)opt d6i v6i baf ky laser He - M va N. - M.
I "
I
4/ Thong s6 dong dQng (J/R) hay tNe/p) cua laser ion hO'i
kim loQi da dtlgc s,p sanh gili'a Iy rhuye! va thY'c nghi~m CUI;)
nhieu tat g1o ~h6'c nha.u d6i v6i vQch phat He , Cd (l.P) va
laser H~-I (loCI. SY'phu hgp co ve quy lu{u bien obi, co ve
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 phQI1116n. &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 fll' phU'O'ngfrinh d9ng hQc cua laser adieu
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. "" " '" .
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
Ip2 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 M9Cdu cac qua frinh kith thich mang tinh chat fling b{jc,
nhtlng fhoa man dieu ki~n INe/P)
= const, nen thoa man dieu
ki,n dong dQng (hinh hQc) trong plasma ph6ng di~n khi'
14
3/ &i~u1I1,n co ban d~ tong suet phat C,!CdQi 10nhi,td9
di,n tlr phai thoa man h, thlic:
ITe ) opt'" a
[
2 (V -V ) (V + C) + 5
[
2 tV _v 1
mB iA d t mB iA
-(V + c)
]

2 + bV (2V -V ) ~1/3
]
~ ;A mB d)
ad6, a =
-~; b "= 16,c = V doi vai laser
l
L. It),
8 ;A
va a = I, b = 10, C = 0 doi vai laser (L.P),
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.
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
N9i dung chu yeu cua lu{ln an da cong be tl'ong cac cong trinh
sou day:
I- &ieu ki~n toi U'uva .hong s6 dong d(;mg t6i U'u cua laser
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'
che kkh thfch ion hoa Penning. rQp chi V{lt l'1, Yi~n Khoa
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
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)
5- Optimum conditions and similarity parameters of metal
vapour ion lasers with excitation mechanisms by charge-
transfer collisions Thong bao Khoa hQc TrU'ong &Qi HQc
TOng Hgp Thanh ph6 ria chi Minh, s6 6, 19C\6.
6- About similarity parameters of gas lasers Thong bao Khoa
hQc TrU'cmg&QiHQc TOng tigp Thanh ph6 He>chi Minh, s6
6, 1986.