KAERl/CM-121/94 RN8 1S^ 91 o|*| 7|# Development of High-Power Laser Technology 3#^ -yj^EM|0|Xig A@7|# Fabrication of a Dye Cell of the High Power Dye Laser and Development of the Measurement Technology of the Fluid Velocities in a Dye Cell ? 7l # # # 4 ^ a AUG 0 6 1390 os Tl master ^ x> ^ ItSrpUTHJN If US DHOHIEM IS WHUMBB niffisi m mmm
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KAERl/CM-121/94RN8
1S^ 91 o|*| 7|#
Development of High-Power Laser Technology
3#^ -yj^EM|0|Xig
A@7|#
Fabrication of a Dye Cell of the High Power Dye
Laser and Development of the Measurement
Technology of the Fluid Velocities in a Dye Cell
? 7l #
# # 4 ^ a
AUG 0 6 1390
os Tl
master
^ x> ^
ItSrpUTHJN If US DHOHIEM IS WHUMBBniffisi m mmm
KAERl/CM-121/94
B||0|X1 7|# 7H#
Development of High-Power Laser Technology
*11^21 7H#
Fabrication of a Dye Cell of the High Power Dye
Laser and Development of the Measurement
Technology of the Fluid Velocities in a Dye Cell
"S 9- #
# # 4 # m
% ^ € 4 ^ ^ ^
DISCLAIMER
Portions of this document may be illegible in electronic image products. Images are produced from the best available original document.
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SUMMARY
I. Project Title
Fabrication of a Dye Cell of the High Power Dye Laser and
Development of the Measurement Technology of the Fluid
Velocities in a Dye Cell
n. Objectives and Importance of the Project
The project objectives are to develope the laser Doppler
velocimeter(LDV) with a directional coupler for the measurement of
fluid velocities in a dye cell and to design a dye cell of the high
power dye laser by using the computer simulation code for the
simulation of the 2 dimension steady-state flow. Since the output
power of the high power dye laser with the pule repetition rate of 10
kHz and the average power of more than 10 W is sensitively affected
by the shape of a dye cell, it is necessary to investicate precisely the
effects of the fluctuation of steady-state fluid and/or the the turbulent
flow. The LDV system is a very useful to analyze the fluid
mechanism in a dye cell. Therefore, it is important to develope the
small size LDV with a single mode optical fiber and a directional
coupler, etc. And a high power dye cell is designed by using the
flow simulation code and the small size Fiber-Optic LDV. Since the
—6—
design technology of a dye cell and the LDV technology are basic
technologies in the field of the high power dye laser, it is urgent to
develope these technologies.
HI. Scope and Contents of the Projects
- The computer simulation code for the simulation of the
steady-state flow in a dye cell is developed by using the finite
element method.
- The situaion of the fluid flow is measured by the diode laser
LDV sysytem and compared with results of the computer
simulation.
- The small size Fiber-Optic LDV with a dirctional coupler is
designed and fabricated for the real time measurement of fluid
velocities in a dye cell.
IV. Results and Proposal for Applications
- The computer simulation code for the simulation of the
steady-state flow in a dye cell was developed and the small
size Fiber-Optic LDV with a dirctional coupler was designed
and fabricated for the real time measurement of fluid velocities
- The design technology of a dye cell is secured by using the
-7-
computer simulation code and Fiber-Optic LDV system
fabricated.
The measurement technology of the fluid velocity using the
noncontact LDV method is developed.
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[1] P. P. Sorokin, J. R Lankard, IBM J. Res. Develop. 10, 162 (1966).[2] F. P. Schafer, Dye Lasers (Topics in Applied Physics VoL 1) (Springer-Verlag,
Berlin, 1977) Chapter 1.[3] F. J. Duarte, HighrPower Dye Laser (Springer Series in Optical Sciences Vol.
65) (Springer-Verlag, Berlin, 1991).[4] T. S. Durrani and C. A. Created, Laser Syatems in Flow Measurement (Plenum
Press, New York, 1977).[5] P. V. Farrell, Opics and Lasers in Engineering 17, 187 (1992).[6] Y. Yeh and H. Z. Cummins, AppL Phys. Lett 4, 176 (1964).[7] 2:% 43%, €#4", 3341, -8-S-I-b] 2, 34 (1989).[8] L. E. Drain, The Laser Doppler Techniques (John Wiley & Sons, Chichester,
1980).[9] B. M. Watrasiewicz and M. J. Rudd, Laser Doppler Measurements (Butterworths
Co., London, 1976).[10] °]7]% "333, 4-B-l-el l, 108 (1988).[11] 3341, 37^43 28A, 23 (1991).[12] E. Moreels, C. de Greet, and R. Finsy, AppL Opt 23, 3010 (1984).[13] 337], frg-jf- ### ^#7/# (^3442 34441
feS-, 44:, 1993).
-96-
Fabrication of the fiber-optic laser Doppler velocimeter of
the forward scattering type using a directional fiber coupler
Jong Soo Kim, Gwon Lim, Choi Wan Hae, Young Hwa Jin, Jae Heung Jo, Soo Chang
Department of Physics, Hannam University, Taejon 300-791, Korea
Sung Ho Kim, Do-Kyeong Ko, Jongmin Lee Atomic Spectroscopy Dept Korea Atomic Energy Research Institute,
Taejon 305-600, Korea
We have designed and fabricated the fiber-optic laser Doppler velocimeter of forward scattering type using a directional fiber coupler in order to measure the liquid velocity in a quartz dye cell of a high power dye laser. The interference fringes with a fringe space of 2.70 m was formed in a dye cell by using a He-Ne laser with the power of 20 mW and a directional fiber coupler with the single mode optical fibers of X = 632.8 nm. From the forward scattering signals, the Doppler frequency of 111 kHz was measured and the liquid velocity of 30.0 cm/s was calculated.
-97-
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-98-
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Chiba, Japan July 10-14, 1995
SPONSORED BYjapIKn SOCIETY OF APPUED PHYSICS
JN^ffUTE Of ELECTRONICS, INFORMATION AND
COMMUNICATION ENGINEERS IEEE/LASERS AND ELECTRO-OPTICS SOCIETY OSAOPTOELECTRONIC INDUSTRY AND TECHNOLOGY DEVELOPMENT ASSOCIATION
— 105-
Post
ers
294 / CLBO/PAOFtC RIM / POSTER SESSION
is removed.1 THs bistable behavior in polarization is based on intracavity anisotropies ofloas and phase. Wc observed the dependence of the polarization switching on the angle of 6 ■ O', 45* and 90* between one of the User polarization and the linear-polarized injection light.
In our experiment, the injected light from a master User (Uniphase 1007S/X) which operated on a single-mode ©solution is swept its frequency by the cavity length variation on a temperature control. A sUve User (USHIO UNL-20SRS) operated on a single-mode with one of two orthogonal natural axes. The Injected poUrization angles 6 for the sUve User are set by the adjastment of an isoUtor. The two orthogonal polarizations were separated by a polarizing beam-splitter arid detected by photo diodes set on the
two natural axes of a sUve User. Their data were sampled by a personal computer through a digital multimeter and CP-16, figure 1 shows polarization switching waveforms when the master laser is swept to lower and higher frequencies for 8 m 0* (p polarization). The first plot is the monitored beat signal between the master and the slave User and the beat frequency shows 0 Hz at a poUrization switching point. The second and third plots show the intensities of p and s components of the poUrization. The bistable polarization state of the switching is found as shown in Table 1. The same state is also found in the ;ases of 6 = 45* and 90* except for * mark in Table 1.
The polarization switching may depend on the cavity anisotropic loss of p and s polarized modes and the splitting frequency between p and s poUrixed resonant frequencies, fp and fs. We assume that the slave User with fp > fs operates on p polarized mode at first for 8 = 0*. When the injected light of p polarization is swept to higher frequency, the s polar-
sampling numberP79 fig. 1. Polarization switching waveforms in the single-mode sUve User when the master laser is swept to lower and higher frequencies for p polarization. The first plot is the beat signal between the master and sUve lasers and the beat frequency shows 0 Hz at a polarization switching point. The second and third plots show the intensities of p and $ components of polarizations.
P79 Table 1. Observed polarization bistability in the sUve laser by injecting a tunable frequency signal from the master laser.
ized mode can not build up at fs because the p polarized mode exists at fp. If the sUve laser operates on s polarized mode at first its mode changes to p poUrixed mode at fp by spatial hole burning effect. When the injected light is swept to lower frequency, the intensity of p poUrized mode at fp decreases by gain saturation effect and s poUrized mode can build up again at fs by spatial hole burning effect. We can take the similar consideration in the cases of 8 = 45* and 90*.
1. S. T. Hendow, R. W. Dunn. W. WChow, J. C. Small. Optics Lett 7.356 (1982)
P80
A new type of optical band-pass filter using total internal reflections
Der-Oxin Su <t a!The architecture of this new type of optical band-pass filter is shown in Fig 1 It consists of a pair of transmission-type volume gratings' G„ C} with identical structures in the upper part and a pair of reflection-type volume gratings G&, C, with identical structure in the lower part. The K-vector diagram1 of each volume grating is shown in circle near that grating. The output of the upper part is the input of the lower part, and the performance of the lower part is opposite to that of the upper part. For convenience, the performances of these two parts are
P80 fig. 1. The architecture of this new type of optical band-pass filter.
written together with a slash. The input wave is normally incident on G,/C. and it can be diffracted by G,/G, into the substrate. The diffracted angle U proportional/mverieJy proportional to wavelength in a transmission-type/ze. flection-type volume grating, respectively. The diffracted angle correspondirwto the central wavelength Xc is designed so that it is equal to the critical angle. Then the component with wavelength larger/smaller than Xc is partly reflected and attenuates obviously as the wave is guided through the substrate. Because the structure of G,/G, is the same as that Gi/C*. the diffracted wave of C,/G« will be parallel to the input wave, that is, the output wave passes normally through the substrate. Hence, the upper/lower acts as a low/high pass filter. Consequently. it can act as a band-pass filter and its bandwidth is determined by the number of total internal reflection and dispersive properties of the volume gratings.1 Y. T. Huang, D. C. Su. Y. K. Tsai,
"Wavelength-division-multiplexing and -demultiplexing by using a substrate-mode grating pair." Opt. Lett. 15.1629-1631 (1992).
2 H. Kogelnik. "Coupled wave theory for thick hologram gratings," Bell Syst Tech J. 48,2909-2947 (1969).
Laser Metrology and Environmental Optics P81-P83
781
Fiber-optic laser Doppler velockneter using a directional fiber coupler
Jae Heung Jo. Jong Son Kim. Wan Hae Choi. Soo Chang, Department ef Physics. Hannam Lfnnwify, Taejon 300-791. Korea Laser Doppler vetocimeter (LDV) that is proposed firstly by Y. Yeh and H. Z. Cumminsts* is a well established technique in many fields such as fluid mechanics and thermal engineering.1 It provides remote, absolute and non-invasive measurement of the velocity distribution within a probe volume, with high spatial resolution. However, there are still some problems in the LDV system, its large body, large probe, and high pnee. In order to solve these problems, the versatility of the technique has been extended by the avail!ty of optical fibers and related components.1 fiber LDV system have been also developed to enhance the potential of the conventional fixed-type LDV.* In this paper, we have proposed the possibility of the small, tight and remote fiber-optic LDV system with a variable directional fiber coupler (DC) in order to measure the velocity of fluids in a quartz dye cell of the dye laser on working and to produce a sufficiently small
instrument.figure 1 is the schematic diagram of
the fiber-optic LDV system of forward scattering type with a DC. Since the visible light is useful foe the arrangement of the optical system and to seek for the position of a probe volume, we use the red He-Ne laser with 20 mW as the source
—106~
riOICA / i.Uw>ro«.<Ki
Ml fig. 1. The schematic diagram of the fiber-optic User Doppler vdotimeter system of forward scattering type with a variable directional fiber coupler (DC), where LI and L2 are lenses, PD the photo-detector; BPF the electronic band pass filter, AMP the 60 dB amplifier OSC the digital oscilloscope.
(wfpplflr'
P81 Fig. 2. The Doppler signal detected by the photchdetector (PD) without pedestal noises. The fluids velocity of 30 cm/s by using the Doppler frequency of 111 kHz and the fringe space of 27 is obtained.
beam. The DC is made of two single mode fibers of He-Ne laser with 3 m long and can be controlled the coupling efficiency by handling distances between two fibers. The laser beam is divided by two beams with same intensity by DC with Intensity ratio of 50:50. These two beams are colliminated and focused at the probe volume in a dye cell by microscope objective lenses and focusing lens L,. The scattering signals is collected at a detector by the collecting lens L2. The signal detected by the photo-diode is served in the digital oscilloscope through the electric band pass filter (BPF) and the amplifier (AMP), figure 2 shows a Doppler signal detected by the photo- detector (PD) without pedestal noises. From fig. 2, we obtain the fluids velocity of 30 cm/s by using the Doppler frequency of 111 kHz and the fringe space of 2.7 |tm. Next, we will try to get the backward scattering signals by using the improved probes that will be made of two transmitting single mode optical fibers and a receiving multi-mode optical 1 2 3 4
1. Y. Yeh, H. Z. Cummins, Appl. Phys. Lett. 4, 176 (1964).
2. L. E. Drain, The Laser Techniques (John Wiley & Sons, Chichester, 1980).
3. D. A. Jackson, J. D. C Jones, OpL Laser Tech. 18.299 (1986).
4. Y. Ikeda, T. Nakajima, S. Hosokawa, JL Matsumoto, Meas. Set. TechnoL L 260(1990).
M2
User long-path absorption experiments udng the Hctroreflector fa Space (R1S)
Nobuo Sugimoto, Atsushl Mhuto, Ichiro Mitsui, Yasuhiro Sasano, Toehikazu Itabe,® Tetsuo Aoti,* Masao Takabc,* Norihba Hirotnoto,* Hlroo Kummori* National Institute jor E/roimanentat Studio, 16-2 Onoftwa, Tbdbdw, Jhendb* 305 Jxpew
Experiments on the earth-satelBte-earth laser long-path absorption measurements of atmospheric trace species are planned with the Retrorefledoc In Space (RIS) for the Advanced Earth Observing Satellite (ADEOS). The ADEOS is a Japanese sun- synchronous polar-orbit satellite which is scheduled for launch in February 1996. The RIS is a single-element hollow cube- comer retroreflector with an effective diameter of 0.5 m.u
In the RIS experiments, a laser beam is transmitted from a ground station, reflected by RIS, and received at the ground station. The absorption spectrum of the atmosphere is measured in the round-trip optical path. The column contents and the vertical profiles of atmospheric trace species are derived from the measured spectra.
figure 1 shows a schematic diagram of the ground system for the experiment The system consists of an optical satellite
M2 Fig. 1. Ground system for the RIS experiment
P82 Fig. 2. Simulated return signal (photonnumber per shot) in the ozone measurement
Niwnbw Density el Oten* (aH)
M2 Fig. 3. Ozone profile retrieved from the simulated signal.
tracking system and a laser transmitter/ receiver system for spectroscopic measurements. We use a tracking system with a 1-5-m diameter telescope at the Communications Research Laboratory We developed an active satellite tracking method which utilizes the image of RIS lit by a second-harmonics Nd:YAG laser. The active method will be used at the same time with the programmed tracking to achieve the accuracy required by the RIS experiments.
For the spectroscopic measurements, we use two single-longitudinal-mode TEA-CO, lasers which have capability of switching laser lines rapidly* One of the lasers is tuned to the laser lines close to the absorption lines of the target molecule, and the other is used for measuring the reference signals. We measure high- resolution absorption spectra of the atmosphere by using the Doppler-shift of the return beam caused by the satellite movement.
figure 2 shows an example of the simulated return signals which is calculated with the actual system parameters and the reflection characteristics of the RIS. In this measurement, the line of a CO, laser is switched every one second to measure the two absorption lines of ozone seen in the figure. Vertical profile of ozone will be obtained from the spectra by means of inversion method using the pressure dependence of absorption line shape, figure 3 shows the ozone profile retrieved from the simulated signals. We plan to measure vertical profiles of ozone and methane, and column contents of CO%. HNOv CFC12. CO. NA etc. with the TEA C02 lasers ('*C,40* °C*tM and their second and third harmonics. ^Communications Research Laboratory. 4-2-1 Nukui-tita. Koganei. Tokyo 184 Japan1. N. Sugimoto, A. Minato, Y. Sasano.
CLECT91. Baltimore, p. 450 (1991).2. A. Minato, N. Sugimoto. Y. Sasano.
Appl. Opt. 31, 6016 (1992).3. R. J. Nordstrom. L. J. Berg, A. F.
DeSimone. N. Sugimoto, Rev. Sri.Instr. 64,1663 (1993).
/
-107-
torch 22, 1995Jae Beung Jo toman University Department of Ryslcs Ojung-dcng 133, Taedck-gi Tfcejcn, 300-791 Rm
Dear Er. Jo:
I an pleased to infona you that your paper stcfaaissicn for the EACXP2C RIH ccmmmas Of USERS AMD ECS3QO-OFZZC3 1995 (CLED/Padflc Rin«9S), July 10 - 14, 1995, in Qllba, Japan at the Kakuhari Masse Convention Center has been accepted as a poster presentation and is scheduled as follows:
PAPER MCMBER: ESI
IMBt TITI2: Fiber-optic laser Dcpplervelocimeter using a directicnal fiber coupler'
SESSION: Paster SessionDUE: Thursday, July 13, 1995 TIKE: 13:30 - 15:30
Thursday, July 13, 1995 13:30 - 15:30
Each author is provided a bulletin board that is 4 feet high by 8 feet vide cn which to display your paper. You my set-up your posterboard cn July 13, 1995 between 13:00 - 13:30 ane remove your paper between 15:30 - 16:00. Authors will remain in the vicinity of the bulletin board for the duration of the session to answer the questions of the attendees. Poster papers will not be supplied will any audiovisual equipment. If you have any questions please contact me at (908)562.3896 by phene? (908) 562.8434 by fax? or [email protected] by email.
Please sign and return the enclosed tvw copyright fom to Mete vega at the JEEB/izas Executive Office by June 9, 1995.
Please note that all speakers and session chairs rust pay the conference registration fee in order to support the Conference, Cccplete registration and other information will be included in the Advance Program. He greatly appreciate your interest in the Conference and we look forward to seeing you in Chiba, Japan.
Regards,
tolissa K, EstrinZZZE/I2DS Meetings Manager, CXByPacific Rin'95
Tetfvtia* Program Information: Q£Q/F*dfic 81m *95 • EEE/tEOS • 445 Hoe lane • PO Bee 1331 • fbcacewey • KJ • 068SH33I • USA TtiL I 908 5*2 3893 • Fa* I *08 $62 S4M
CartbC Mormadon: QEOvradSc 8Sm *95 • Oim\ • Sumfcomo fodoon Te»«ho it tea. S< Te»o 7-deme • KoroBi. Tei)e 13$ Japan • T<L *61 3 5432 7721 • 35612772$In tiw US. and Europe CLEO/Fadfc JBm VS • OS\ Coherence Sevfce Dcparoncm • 20! OManadxflett VWcnue. NW • W*h»roeon. DC20036-1623 • USA• Tet I 202416 *950 " F« 1 2024166140
-108-
fie Pacific Rim Conference on Lasers and Electro-Optics
.,-Makuhari Messe Convention Center : Chiba, Japan
July 10-14, 1995
Co-Located with lnterOpto'95
peaImproved Performance of Vertical-Cavity Modulator through the use of Diffused Quantum Watt*, EH. U, W.OH. Choy. 77m
Unlvarsfycf Hong Kong. Hong Kong The transmission and fcs SekHnduced-change spectra of a verticaFcarity Fabry-Perot AViGa^jAVGaAs rfiffused-quantum- wel modutslor are analyzed and results Indicate improved modulation performance and capa- b*y to wide bandwidth applications.
PTOImpurity Induced Disordering Produced Lateral Optical Confinement In AIGaAsASaAs Quantum WeO Waveguide*, EK. U. C.*8. Cheung. W.-K. Tsui. 77m University of Hong Kong, Hsng Kong Atwod*nensionalA)6aAs/6aAs quantum wefl waveguide with lateral optical confinement can be produced using Impurity Induced disordering. The tingle and mufti mode gukfing requirements are analyzed In terms of mask width, hyeta thidmess. and wavelengths.
P71A Simple and Efficient Scaler Finite Element Approach to Nonlinear Optical Channel Waveguides, A. Nlryama. M. Koshba. Hokkaido University. Sapporo. Japan A unified scalar finite element approach is developed to both TE*fte and TMfiko nonlinear waves in three-rSmeosional optical waveguides. Propagation characteristics of nonlinear efiptical core fibers and graded-index nonlinear channel waveguides are investigated in
detal f
P72Propagation of Incident Gausalsn-Beam Down Adjoining Nonlinear Planar Waveguide, J.-S. Jeong. SK Song. S.D. Jung. E.-H. Lee. Electronics and Telecommunications Research Institute. Taejon, KonaIn adjoining nonfinear planar waveguide, we present numerical restits that a sectary wave can be generated from high-power Gaussian beam excitation after propagation of few hun-
OPT1CAL SWITCHING. COMPUTING AND INFORMATION PROCESSING
P73Optical Adaptive Processing for an Intensity Invariant Pattern Recognition, K. Matsuoka, M. Taniguchi. Y. Mckuno, Osaka National Research Institute, Osaka. Japan We propose optical adaptive dberimhation to a pattern recognition by using a two-correlator system, which achieves an intensity Invariant recognition by adaptive thresholding. Computer simulation results show the performance of optical adaptive discrimination.
P74Use of Limited Distortion Invariant Correlation Fitter* for Recognition of Road Signs/ 14. Taniguchi. K- Matsuoka. Osaka
National Research Institute, Osaka, Japan We propose multiple-object correlation fitters with fimtted distortion invariance to the recognition of road signs. To detect the distorted signs, the techniques of Mefin harmonics decomposition and synthetic discriminant function are applied.
P75Unified Fitter Modulation Synthetic Discriminant Function, RJC Wang, IX Watson, C.R. Chafwin, University of Glasgow, Glasgow, UKVia the fitter modulation operator N, the modified fitter synthetic discrimination totetion permits advantageous preprocessing of hdMdual training-set Images that are used to construct the filer synthetic dscriminant function which eppfies a modulation operator M.
P76A Compact Implementation of Optical Omega Network, K.W. Wong, T. Ngal, LM.
Cheng. City University ot Hong Hong. Kowloon Tong. Hong Kong A technique to the compact implementation of optical Omega network k proposed. By using this technique, the whole Omega network b realized by a single set of optics in a time-multiplexed recursive manner.
P77Application of Reflective Block Optics to a Discrete Correlator, D. Miyazaki. K. Matsushita. Osaka Ctty University. Osaka. JapanReflective block optics (REBOP) k a packaging technique for rigid and reliable optical computing system. We present experiments on a preliminary system based on REBOP. In addition, we propose use of a sek-atgning
technique for REBOP.
P78Reduced Alignment Accuracy Requirement for Free-Space Optical Interconnection Using Focused Gaussian Beams, K SasaH. K. Shinozakf. T. Kamfoh. OH Electric Industry Company Limited. Tokyo. Japan Numerical simulation reveals that the alignment accuracy requirement for free-*pace optical interconnection k severer for lateral misalignment than longitudinal one. It k also shown that lateral misafignment requirement b greatly reduced by using focused Gaussian beams.
P79Optical Polarization Switching and Bistability by Injected Light In a 633nmHe- Ne Laser, T. OWa. S. Ohno, Y. Atoro, T.
kfinose, Doehbha Univetsfy, Kyoto. Japan Optical polarization switching and bbtahety in
a single-mode 633 nm He-Ne laser are observed by Injected fight with the polarization axes of 0*. 45* and 80*.
PSOA New Type of Optical Band-Pass Fitter Using Total Internal Reflection*, D.-C. Su,
J.-T. Chang. W.-R. Un. Y.-T. Huang. National Chlao Tung University, HstnChu, Taiwan. R.O.O.Anew type of optical bandpass fitter which consists a pair of transmission-type volume gratings and a pair of reflection-type volume gratings k proposed and a sample k fabricated to testing Us quafity.
LASER METROLOGY AND ENVIRONMENTAL OPTICS
P81Fiber-Optic Laser Doppler Velocimeter using a Directional Fiber Coupler, J.H. Jo. JS. ton. WJL Choi, S. Chang. Hannam University, Taejon. Korea We have designed and fabricated the fiberoptic laser Doppler vetodmeter using a directional tber coupler in order to measure the velocity of fluids in a quartz dye cel of the dye laser.
P82Laser-Long-Path Absorption Experiments Using the Retroreflector (n Space (RIS). N. Sugimoto. A. Mmto, 1. Matsui. Y. Sasano. National Institute for Environmental Studies. Ibaraki, Japan. T. Itabe. T. Add. M. Takabe. N. Hiromoto. H. Kunimori, Communications Research Laboratory. Tokyo. Japan Plan for earth-sateCte-earth laser long-path absorption experiment using the Retroreflector in Space b presented. Vertical profiles of ozone and methane, and column contents of CFC12. HNO> etc. win be measured with sin- gte4ongrtudmal-mode TEA CO] lasers.
P83High-Accuracy Dimension Measurements of Complex Optical Parts using Femtosecond Optical Pulses, K. Minoshrma. H. Matsumoto. National Research Laboratory of Metrology. Ibaraki. Japan Dimensions of complex optical parts are accurately measured by using femtosecond optical pulses. The overlapping optical pubes from the parts can be separated by mating nonlinear second- harmonic correlation with reference pubes with variable delays.
-110-
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1) J. L. Santos, T. P. Newson, and D. A. Jackson, Opt.Lett. 15, 573 (1990).
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1) Thang T. Nguyen and Le N. Binh, Appl.Phys.Lett. 45, 1163 (1984).
2) Manfred Stieglmeier and Cameron Tropea, Appl.Opt., 4096 (1992).
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BIBLIOGRAPHIC INFORMATION SHEETPerforming Org.
Report No.Sponsoring Org.
Report No.Standard Report NO. INIS Subject
CodeKAERI/CM-121/94
Title / Subtitle Fabrication of a Dye Cell of the High Power Dye Laser and Development of the Measuerment Technology of the Fluid Velocities
in a Dye Cell
Project Manager and Dept. Jae Heung Jo, Dept, of Physics, Hannam University
Researcher and Dept. Soo Chang, Kwon Lim, Jee Teak Kim, Wan Hae Choi (Dept, of Physics, Hannam University)
Pub.Place Taejon Pub. Org. KAERI Pub.Date Aug.18,1995
Page 111 P. III. and Tab. Yes(0), No( ) 3. 7] cm.
Note
Classified 0pen(0),0utside( ),_Class Report Type
Sponsoring Org. Hannam University Contract No. 94C-28
Abstract (About 300 Words)
o The computer simulation code for the simulation of the steady-state flow in
a dye cell is developed by using the finite element method.
o The situaion of the fluid flow is measured by the diode laser LDV
sysytem and compared with results of the computer simulation.
o The small size Fiber-Optic LDV with a dirctional coupler is designed and
fabricated for the real time measurement of fluid velocities in a dye cell.
Subject Keywords (About 10 Words)
Directinal Coupler, Scattering,Laser Doppler Velocimeter, Dye Cell,
Interferometry, Fiber-Optic LDV
*** serial no., ## research year
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