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CONSTRUCTION AND PRELIMINARY STUDY OF TUNABLE DYE LASER. (U)NOV 18 Y CHU~~ C SHIH. H YEN

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FOREIGN TECHNOLOGY DIVISION

9:z UCONSTRUCTION AND PRELIMINARY STUDY OF TUNABLE DYE LASER

By

Chu Yl—min , Shlh Chien—ping and Yen Hsiao—pai

D D G ~~~3 APR 1979 iiU~~~~LbU 1J 1!3 ,

• Approved for public -release;distribution unlimited.

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FTD—ID(RS)T—2059—78 29 November 1978MICROFICHE NR: ~2~j J- ~~ COf(0O’-/CONSTRUCTION AND PRELIMINARY STUDY OF TUNABLEDYE LASER

By: Chu Yl-min , Shih Chien—ping and Yen Hsiao-pai

English pages: 5 ’Source: Acta Scientiarum Naturalium Universitatis

Sunyatseni, Nr . 3, 1976 , pp. ~6_l38

Country of Origin: ChinaTranslated by: LINGUISTIC SYSTEMS, INC.

F33657—78—D—0618H. P. Lee

Requester : FTD/TQTDApproved for public release; distribution unlimited.

THIS TRANSLATION IS A RENDITION OF THE ORIGI.HAL FOREIGN TEXT WITHOUT ANY ANAL YTICA L OREDITORIAL COMMENT. STATEMENTS OR THEORIES PREPARED BYADVOCATED OR IMPLIED A RE THOSE OF THE SOURCEAN000 NOT NECESSARILY REFLECT THE POSITION TRANSLAT ION DIVISIONOR OPINION OP THE FOREIGN TECHNOLOGY DI. FOREIGN TECHNOLOGY DIVISIONVISION. WP.AFB. OHIO.

FTD —ID(RS)T—2059—78 Date 29 Nov 1978

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Construction and Prel1~t1n~7 Study of Tunable Dye Laser

ByChu !i—min ~~ih Chien—ping and Yen Hsiao-pai

Optics Specialty, I~ partment of Physics

1. Introduction

Generally t~e oscillatory wave length of a laser is not variable , so

its application is greatly limited. But a tunable dy laser can continuously

vary its oscillatory wave length in a great range in the vicinity of an

area where it is visible, and it has been , therefore, at~plied to the following Lk-~~

areas.

(i) Isotope Separation. Using the difference of wave length of sharp

absorption spectra arnong isotones , the wave length of a laser can be adjusted

in tune with absorption spectrum of only one isotope . Then it can be

selectively stimulated and made separate from other isotopes. This method

can be used to separate U235, and, according to some statistics, it can save

cost by 90%, compared with the traditional vapor diffusion method.

(2) Pollution—finding Radar . To the incident light of different wave

length, dl t’ferent materials show strong action of diffusion or ab.orption . So

a laser , of which the wave length can be adjusted, can be used to find the

S composition and density of the atmospherically polluted materials,

(3) *gricultural Seeding and Medical ApplicatIon. The chromosome in

a cell i~ very sensitive to some wave length of the outside light. Under Sthe action of a light with such a wave length, genetic variation will oco~w

obviously, For instance, in an experiment of laser seeding, the Department

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of Biology of thia University uses tunable dye laser with a range of S

5600! — 620O~ emitting light to shine on the rice seeds. The variation S

rate is higher than the &~‘cO2,He — Ne laser.

(4) Spectroscopy. The light emitted from a tunable dye laser is always

of unicol~~~ and directionality. It is strong and can freely select its wave

length. So it is an ideal light source for spectral analysis. When it is

used in atomic absorption spectrum, fluorescence spectrum or Raman spectrum,

it can help to promote the sensitivity of the analysis and have a measurement

with high accuracy in a shoi~ period of time.

Using four di~’ferer.t kinds of dyes, we obtained laser emission, of which

S the wave length can be freely selected in a range of 53OO~ — ‘7OO0~ , and

found the relationship between the denisty of dyes and the adju stable ranges.

2. Basic Principles and the Structure of Laser

Diagram 1 is a typical diagram of the molecular energy level of organic

dyes. What the laser used is corresponding fluorescence S~ ~ So which is

allowed to leap forward. Because the width of fluorescence spectrum can

S reach several hundred angstrom, the oscillatory wave length can be freely

selected in a certain range. S

The Instrument used to select oscillatory wave length can be a grating,

prism, calibrator and the like. We chose to use a reflecting grating of S1200 tiao/mm. * We put the adjustable grating at a position that can make

* t~~i is a Chinese transliteration which literally means a stri~~~u a u.

2

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only the radiation which selects wave length radiate along the direction

of the laser axis and oscillation can occur on the selected wave length. S

The life—span of Si state is rather short. If the number of particles

between S1 and S~, can be reversed, there must be sufficient stimulation. In

order to save the laser lost caused by triplicity light absorption, we chose

to use pulse N2 laser as stimulation source,which can be accelerated quickly. S

The structure of tunable dye laser can be seen in Diagram 2.

N2 laser s laser wave length is 33’71t; pulse power is 1 megawatt; pulse

width is 10 nanosecond; and repetition rate is 50 times/minute.

Quartz dye box: Length is 2 centimeter; thickness is 0 ,5 centimeter;

and heigth Is 2.5 centimeter.

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Diagram 1 Diagram of molecular Diagram 2 Tunable dyeenergy level of dyes laser

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3. Three and Mjuetable Ranges

&ccording to the order of sodium fluoreacein, rhodmine 60, rhodasnine B

3

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5 5 5 5 5 ____

S and methyl phenol purple, laser emission of any wave length in the range

of 5350X~t 7000k can be obtained, The solvent of the dyes is alcohol and

the concrete data can be seen in Ttble 1.

Table I.Density Adjustable Turning ang le

Dyes ~mole/liter~ range (~) of gratingSodium fluorescein

- 2~~ x 10 5350 5~5Q l°44’Rhodamine 6G 1.2 x 103 5’~’50 6200 1050 .?

Rho&aniine B 2,0 x 10—i ~950 6350 1°26’Methyl phenol pur~p~1e 4.2 x 10— -’ 6450 7000 ___________

Measuring error is ± 201.

4. Impact of rare Density on Adjustable Range

The oscillatory wave len~’th of dye laser will vary according to the

length of dye box, dye density, temperature and the lost in resonant cavity.

If the dye box, resonant cavity and temperature are f ixed, when dye density

is changing, such phenomena can be diseov~réd as the density is ~increasing, and

the maximum oscillatory wave length moves toward the longer wvie: when density

is reduced, it moves toward the shorter wave. And there is a density, which

can make the adjustable range the largest.

The result of’ experiment of the relationship between the density of

S rhodaznine 60 and sodium fluorescein arid the adjustable ranges can be seen

S in Table 2 a.d Diagram 3.

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Tab1e~~~ __________ ______- S_________ _____________

Adjuetabis ~~ Adjustableran gss (1)

~~~~~~~~~~~~~~~~ ranges (1)$. & *IG ’ $OOO 5$~O ~~~~ •45S 5 .

~ 1.I)C *U~~ U7O —ö410

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•.0X 1O~~ 0L0U~’~.10 o 2~9X1O 575’)~..~~tO 3 S

•1~.‘~X 10 ’ 6OUO’—~6SU 1.4X ~ 0 - 5650— 63bJ

0~,5X 10 ’ b85O~~~8Ii0

7 .6X 10 ’ No oscillat~ion~ _________ __________

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Diagram 3 ~~pez~.mp~t curves ofdensity and adjustableranges. S

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