Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
- Holography- Optical memory- Short pulse generation- Nonlinear optics
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
(Holography)Hologram : whole message
- 1948, Dennis Gabor : (1972 )- 1960, Michigan , E. Leith, J. Upatnieks : ,
off-axis .- 1960, , Denisyuk : ( ),
. - 1970, Benton : (),
, . - 1977, Cross :
D. Gabor
Denisyuk
Benton
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
1.
2.
r1r2
r3
)}({exp rkti rr
film
http://km.naver.com/list/view_detail.php?dir_id=50201&docid=46501http://km.naver.com/list/view_detail.php?dir_id=50201&docid=46501
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
()
1.
laser beam
film
mirror
2.
film
mirror
.
virtual image
object
.
http://km.naver.com/list/view_detail.php?dir_id=50201&docid=46501http://km.naver.com/list/view_detail.php?dir_id=50201&docid=46501
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
1.
2.
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
Holography
This 10x8 inch two-step full color reflectionholographic stereogram of an Acura NSX was madeusing a single laser wavelength (647 nm), anda single high-resolution photographic plate.Color was produced using the "In-Situ" color controltechnique developed by Spatial Imaging alum Julie Parker.Data courtesy of Alias Research and HondaR&D Company.
Here is a large-scale one-step holographic stereogram.The film measures 1 x 1 meters, and the image volumeoccupies approximately 1 meter of depth. This hologramwas produced in conjuction with research done forGeneral Motors Corporation in 1991. It is composed of1000 separate exposures, and displays a 45 degreeviewing angle.
- Display(3 , TV, Head up display, )
- Interferometry(, , , , )
- Holographic optical memory- Pattern recognition- Diffractive optical elements(DOE)- , ( )- , ,
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
Capacity(
Gbit/in
2)
10-1
10
1
1980 1990 2000 2010
(Products)
PC(Phase change)
MO(Magneto-Optic)
Mixed
CD ROM(650MB)
DVD ROM(4.7GB*2)
ASMO
5.25MO(1X)
5.25MO(2X)
1st DVD RAM2.6GB*2
MAMMOS
HD DVD~1.5GB*2
IOPM
Holography
5.25MO(8X)
CD ROM(650MB)PD
(650MB)
2nd DVD RAM4.7GB*2
3rd DVD RAM~15GB*2
3D multi-layer
102
(optical memory)
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
1. CD(compact disc), DVD , , , ,
http://imagesearch.naver.com/search.naver?where=dt_iphoto&query=cd&sort=0&scp=0&c=2&qt=df&xc=&top=1
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
pit land =>
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
CD-RW
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
2. Holographic optical memory
- CD/DVD
- :
(Photorefractive crystal)
(photorefractive polymer)
(photochromic polymer)
(Photoisomerization polymer)
(Spectral hole burning material)
- : , ,
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
Ar+ ion laser
/2 WP
PBS
BE SLM spatialfilter
CCD
reference beam
image beam
polymer
shutter
/2 WP
camera
(PDR1)
514.5 nm
computer
Holographic data storage
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
Original images and reconstructed images in PDR1 film
< Original Images > < Reconstructed Images >
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
HDDS (holographic digital data storage)
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
Photorefractive Crystal VHDDS(Volume holographic digital data storage)- IBM
Holographic data storage HM-100 -Holoplex
Input beam(signal arm)
SLM
Signal Beam
Input beam(reference arm)
Recording/Readout Head
Lens of high NA
ReferenceBeam
Axis of disk rotation
CCD
HolographicDisk Shift
MationOutput beam(reconstrnctionarm)
z
x
L
s
za
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
Short pulse generation- Q switching- Mode locking
1. Q switching: sudden switching of the laser cavity Q from a low value to a high value
full mirror output coupleractive medium
Switching method- Rotating mirror- Electro-optic switching- Saturable absorber
Pulse width ~ 10 ns
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
Rate equations
IcgINc
dtdI
t= 2)(
222122 )( KNIN
hdtdN
+=
Put, tNch
Ix=
1
2
NNy =, , tcgt=
xyxyddx
= )1(
y x
y
x
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
2. Mode locking: locking the phases of longitudinal modes by modulating the cavity Q
Modulation method- Acousto-optic modulation- Electro-optic modulation- Saturable absorber
Pulse width ~ 10 fs full mirror output coupleractive medium
modulator
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
Acousto-optic modulator: photoelastic effect
PZT(piezo-electric transducer)
acousto-optic cell
Electro-optic modulator: Electro-optic effect
ACpolarizer
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
)sin()sin(),( mmmmmm tzkEetzE +=r
Mode locking pulse
Electric filed of m-th longitudinal mode
where, L
mkm
= ckmm =,
Assume, 0=m
Total electric field in the cavity
)}(cos),()(cos),({2
),( 0)(
0)(0 ctzktzActzktzAtzE NN +=
+
where, N : number of modes
Nonlinear Optics LabNonlinear Optics Lab. . HanyangHanyang Univ.Univ.
Mode-locked laser system and mode locking pulse
fs Ti:sapphire laser system
Mode-locked pulse
2L/c
Pulse width : 2L/cN
- Holography- Optical memory- Short pulse generation- Nonlinear optics
