3:30pm
-
4:OOpm
(In i ed)
NL07.1
OBSERVATION
OF
TC~'O-DIiklENSIONAL
SPATIAL
SOLITARY
WAj'ES
IN
A
x(2)
h1EDILJiM
William
E.
To uellas, Geo ge
I.
S egeman
C.R.E.O.L.
Uni e si y o Cen al Flo ida
12424 Resea ch Pa kway, O lando,
FL
32826
el.: (407)
658
39
18
ax
:
(407)
658
3955
Lluis To ne
Poly echnic Uni e si y o Ca alunya
Dep . o Signal Theo y and Communica ions
P.O.B.
30002,08080
Ba celona, Spain
While s able ilamen s ha e been obse ed o p opaga e in a omic apo s, he
la e obse a ions equi e e y nea esonan condi ions and hus a e associa ed wi h
elec omagne ic losses o he a omic medium. Such an obse a ion has been impossible
in condense media. Indeed he necessa y sel - ocusing which can cancel di ac ion
appea s in all media and i i
is
he only nonlinea op ical p ocess p esen esul s in
uns able p opaga ion beha io o 2D ans e se beams and e en ually op ical beam
collapse.
A
possible way
o
s abilize a 2D ans e se beam is o ind a ma e ial wi h
ei he a sa u able nonlinea esponse o equi alen ly highe o de nonlinea esponses
p esen . Un o una ely in mos condense media op ical damage seems o appea be o e
such highe o de p ocesses come in o play.
Cascaded second o de nonlinea p ocesses o e a new ange o oppo uni ies in
ha sense. Indeed we ha e shown ha unde nea phase ma ching condi ions, he
associa ed nonlinea phase dis o ion o he undamen al wa e deple ion ollows a linea
dependence wi h he op ical ield s eng h and no he op ical in ensi y, Fig.1.
Equi alen ly in such a egime cascaded sel ocusing e ec s a e inhe en ly equi alen o
a sa u a ed in ensi y dependen phase dis o ion, hence mul i-dimensional soli on like
beams should be obse able in anspa en
X(2)
nonlinea op ical media. The
elec omagne ic ield p opaga es hen in a s ongly coupled egime whe e bo h he
undamen al po ion o he ield and he second ha monic a e locked oge he , no only
bea ing di ac ion bu walk-o induced by he na u al bi e ingence o mos
X(2)
media,
Fig.2.
We belie e he obsena ion o such s able p opaga ing modes o second o de
nonlinea p ocesses
is
opening
he
doo
o
a
new'
ealm
o
oppo uni ies
in
he
design
o
pa ame ic con e e s in addi ion o a new amily o op ical phenomena in ligh wa e
manipula ion, among hem all op ical soli on beam s ee ing has al eady been obse ed.
19
100.
1
APL=
10
60
ApL=
1
40
ApL=O.Ol
20
Inpu
ampli ude
10
GV//cn"Z
'npu
14
I
FIGURE
#
1
0
150
2PO
i::
5;
1
CO
acial
Dimensicn
IC-
1
CO
150
2CO
55
ac-al
Cimens:on
FIGURE
#2
20