LABORATÓRIO DE
ÓPTICA
INSTITUTO DE FÍSICA
"GLEB WATAGHIN"
UNIVERSIDADE ESTADUAL DE
CAMPINAS
CAIXA POSTAL 6165
13083-970 CAMPINAS-SP
BRASIL
PHONE / FAX:
+55-(xx)19-3521-4145
NOTE: local operator code (xx) only for inside Brazil
calls
Uniaxial
birefringent photorefractive lithium niobate crystals illuminated with convergent white light and
observed between crossed polarizers with the optical
axis perpendicular (left) and parallel (right) to the plane of the
photograph
Prof. Dr. Jaime Frejlich
CNPq research fellow
Grade 1B
phone:
+55-(0)19-3521.24.50
Publications
and other academic informations
Prof.Dr.
Lucila Cescato
CNPq research
fellow
Grade 1C
SUPPORT STAFF:
Mrs. Aparecida do Carmo Silva
Almeida
Technician
Mrs. Eronilde
Pereira da Silva
Secretary
STUDENTS AND VISITING RESEARCHERS:
Dr. Agnaldo A. Freschi................................
Cooperating Researcher
Dr. Paulo M.
Garcia................................ Cooperating
Researcher
Dr. Pedro V.
dos Santos............................... PhD Researcher
Dr. Celso
Molina............................... PhD Researcher
Tatiane Oliveira dos
Santos............................PhD student
Daniel Souza Ferreira
Magalhães............................PhD
student
Noemi I. R.
Rivera................................................PhD
student
Edson José de
Carvalho..................................PhD
student
Renata Montenegro
Pereira................................................MSc
student
Nilson Roberto
Inocente Júnior...........................................undergraduate
technical scholarship student
CURRENT RESEARCH LINES:
Holografic Optical Components (HOC):
Research and development of new methods for the fabrication of HOC, mainly holografic gratings, and nondiffractive high spacial frequency structures (polarizers, retardation plates, etc.). The research on this subject is concerned mainly with photosensitive polymers and semiconductors are involved. The experimental setup is based on actively stabilized holographic recordind techniques that were developed in our laboratory, and allow very reproductible and controlled experimental conditions. There is a formal cooperation agreement with Eletrical ngeneering Institute in UNICAMP (FEE-UNICAMP) in order to develop plasma etched high frequency patterns on different substrates (semiconductors, glass, quartz, etc.)
Opto-Electronic Devices
Holographic techniques associated with litographic processes or with photo-electrochemical processes have been applied to the fabrication of semiconductor devices such as Distributed Feedback Lasers (InP-Project for TELEBRÁS), and Broadband Light Absorption InP Surfaces for Photovoltaic Conversion.
Diffraction Theory, Measurements and Applications:
This research is closely related to HOC fabrication and is centered on diffraction from holographic gratings. The main objectives are both, the development of nondestructive remote techniques for monitorating of the grating fabrication process, and the characterization of the gratings. Many real-time monitoration techniques have been already developed using diffraction methods in the scalar theory approximation, for thin films etching (wet and dry) processes.
Photorefractive Crystals:
Photorefractive are photoconductive
electro-optic materials that are able to record a pattern of light in the form
of a reversible index-of-refraction modulation, that is to say, a volume
hologram. These materials are interesting for signal processing, phase
conjugation, optical memories and optical computation. Fundamental and applied
research are being currently carried out on photorefractive crystals of the
sillenite family (Bi12SiO20, Bi12TiO20) (most of them
produced in Brazil), semiconductor crystals such as GaAs, photovoltaic LiNbO3, and other crystals like SBN,
KNSBN, BaTiO3, etc. New holographic techniques are being developed for the
research of fundamental properties (density of photoactive traps, charge
carriers diffusion lenght, quantum efficiency for
photoelectron generation, photochromic effects, etc.)
of these crystals. Applications directed to optical memories and holographic
interferometry for 2D vibrational mode display
are currently carried out. Cooperation agreements with other
laboratories in
Wave Coupling in Photosensitive Materials
The beams of light used to record a hologram in the volume of a photosensitive material exhibit changes in their amplitudes and phases (wave coupling) which are determined by the feedback between the pattern of light projected onto the material and the changes, of the materials' parameters, produced by the light. The matter is particulary interesting for the case of real-time reversible photosensitive materials like photorefractive materials, but is not restricted to them. Most of the applications involving photorefractive crystals (optical memories, signal processing, phase conjugation) are concerned with such amplitude and phase coupling. We are currently researching on this area in view of photorefractive material characterization and applications.
Vibration Measurement:
This subject is closely related
to photorefractive crystals research but is
not restricted to photorefractives. We intend to
develop practical methods for quantitative measurement of vibration in surfaces.
The methods being currently explored for this purpose are real-time dynamic
holografic interferometry
using photorefractive crystals as recording media, and laser Doppler vibrometry. Both techniques are already operational: the
latter is suitable for accurate and rapid
information about single points on the surface, whereas the former
provides with immediate 2D information about vibration as well as
deformation. Research is continuously being carried out to improve the performance of these techniques. An
intensive course on Optical Techniques for the Measurement of Vibrations and
Deformations, directed to high level technicians in the industry, was carried out on March/98 in cooperation with collegues from the Faculty of Mechanical
Engineering/UNICAMP. The course may became a periodic
event.
Research on Three-Dimensional Imaging:
Cinematography: projection of images
with continuous horizontal parallax under white light, coming from objects or
from holograms being enlarged to a diffractive screen of 0,75m x 1,2m surface.
Analytical calculations and vexperiments demonstrating
the capability of doing microcomputer generated figures with continuous horizont parallax by means of diffraction coding and
decoding of white light. A vector system is being performed by means of
galvanometric deflectors, a raster system by means of a lyquid crystal TV projector.
SERVICES AND SUPPORT TO
INDUSTRY
Members of the laboratory are able to
give technical and scientific support in many fields of
Optics. These activities are administrated by the FUNCAMP, a nonprofitable public organization of the
EQUIPMENT AND SUPPORT FOR RESEARCH
The laboratory occupies approximately 400 square meters in a single building, divided into administrative, services (computing, mechanics, eletronics, optics), special areas for chemical work, clean room for microelectronics handling with humidity and temperature control, staff and students desk area and six independent research laboratory rooms, all equiped with good quality optical benches, central air conditionning, cooling water suply for Ar+ lasers and 220V (triphasic), 110V and stabilized 110 V power supplies, and a local computer network interconnecting our computers to the University network. The laboratory has some laser sources of different kind (Ar+, Nd:YAG, He-Ne) and different power (0.5mW to 5W multiline), as well as incoherent light sources includind 75 W and 1000 W Hg and Xe high pressure lamp sources. The laboratory has mechanical supports and electronic equipment includind amplifiers, light detectors, PZT-systems, microcomputers, high voltage sources, etc. The laboratory is enjoying from all services available from the INSTITUTO DE FÍSICA and from the University itself:, including Libraries, glassware, mechanics and electronic officces, central computer and SUN workstations, etc.
The laboratory is part of the BRAZILIAN COMISSION FOR OPTICS
since the foundation of the latter in 1984.
PRONEX: "Photosensitive Materials"
F428:Notas de aulahttp://www.ifi.unicamp.br/~frejlich/optica.pdf
NOTAS DE AULA: OPTICA
F-428: EXAME FINAL
sera no dia 12/7/2006 em sala e horário habituais
Comments and suggestions?frejlich@ifi.unicamp.br
hits since January
2003