DE2025246A1 - - Google Patents

Description

WBSiDBHN BIiBGTHIO COMPANY INC Pinnow 4 / 6-42 / 50 NBW YORE, N, Y. 10007 "USA Image display arrangement

The invention relates to projection picture display devices and principally to those using black · » Create white images using incoherent light.

The interest in laser image reproduction systems is based on the possibility of τon screens of practically unlimited size to be able to have · Many of the elements necessary for such systems are currently available «Even intensive lasers that at a range of frequencies within the visible Ropes of the spectrum work, as well as modulation and scanning methods of sufficient capacity, are for the available for most projection use cases.

The most common way of generating images by direct reflection of visible laser imaging has two main components · First, the images are monochromatic at a certain, well-defined wavelength, so that images are generated with the help of an argon ion laser, for example , blue * sohwarz sindf and secondly the Heflexion generates a coherent Läer-AusÄangsstrahls a "blotchy ή · image due to a periodic terstärkung of the scattered beam. See "Bell System leohnioal Journal ·, page 1479» September 1967 ·

000849/1372

As far as known, nooh is no with a laßer working image reproduction system has been demonstrated or provided, the Sehwars-Weiö «image provides which are free of spots.

A Laeer image display system provides a black and white image with minimal blotchiness. The system according to the invention is based on the use of a phosphorescent screen made of garnet activated with the aid of a laser, which functions in the visible range at a slightly shorter wavelength than the main immission of the screen. In a Ausführrangeform a cerium-containing Xttriumaluminiumgranat used · The characteristic ßelhatioh dea of this phoaphorisierenden Sub β tans tmifeierten Lioht®s w xa AEVA ^ & h eia © dosed reflection of a rope d © s Läer-olmjiission & liehtes set to dad for the luge quite a blank Impression is created.

From a compositional point of view, one embodiment of the invention provides a screen which is coated with G * t dotieaytea.Yttriumalumiaiumgraaat (YJM3) and is excited by an irgon ion laser ending at 4 * 880 units. The luminous phosphor activated with 0 emits in a three-dimensional wavelength range which is centered at about 5 · 5 Angstroms.

Variations include other examples an oadmium ion laser, itr emits at 4 · 416 Angetra »,

009849/1372

likewise variations in the composition of the phosphorescent substance · All these compositions are with Ger activated and use a host lattice of the garnet structure (i.e. the structure of Υ-Α1 ~ 0ΐ2) γ since this is the only one a suitable combination * for generating an emission emission is more suitable Color and brightness is · However, the absorption peak of the phosphorescent Bubstani can be shifted, in order to have a closer · adaptation to the specially used inspiring source su have} and su can serve this purpose. Aluminum partially diarose gallium er se te t to be a Shift in absorption to achieve shorter wavelengths, or the yttrium can be partially or completely Gadolinium orsetst be to achieve a shift in absorption su longer wavelengths su * Da a shift in absorption is generally a corresponding one Shift in the fismlesion in the same direction a remote setting (e.g. sum Obtaining a white image) can still be made by reflecting part of the laser beam · Others Variants will be explained later «

In another embodiment of the invention, a variety of phoeophoric compositions are used, i.e. are at least partially organic. The present System according to the invention is based on the use of laser energy at one or more wavelengths of which at least one in the visible or ultraviolet range

0098 49/137

a slightly shorter wavelength than that of the main part the phosphorescent radiation of the used light phosphor is located.

Because of the large number of organic luminous phosphors that sioh for the present purpose © igmen are only a few Limitations on the nature of the exciting laser given. Suitable lasers include the argon ion laser emitting at 4880 Angstroms and that at 4,416 Angstroms emitting qadmium ioneh laser. Bar wavelength range suitable excitation light sources for usable monochromatic image reproductions is between about 2,500 and about 5 * 500 angstroms.

Special wavelengths within this latitude are masked out according to the properties of the phosphor. Suitable Leuehtphosphore are below in individually described. Generally speaking, suitable materials are organic fibers or pigments of which numerous are commercially available and widely used.

In the present description, the term 'coloring' substance "or" organic coloring substance "used g hler * It goes without saying that this expression includes the photolu "in" reduced organic dyes and pigments. Pigments are particularly »useful and can by dissolving a · Dyestuff in an organic kimeth resin solution; which is then subsequently condensed «In is it is known that the luminescence level decreases in certain cases

OD'dÖAÖ / 1372

can be magnified when the dye is absorbed on a colloid that takes the form of oil fastrn or from high molecular weight polymer particles.

They doped with cerium in the image display device YAGr as luminous phosphor are the absorptions in the Leuoht «· phosphors in general broadband, and the! missions « tip is comparatively insensitive to a shift in the exciting wavelength · This phenomenon is very brewable because the laser sources have to be exchanged made possible without pronounced changes occurring in the appearing mission color.

You aforementioned embodiment of the invention is based on the use of such organic substances. Monochromatic image reproductions result from the use of clay screens with homogeneous fluorescent phosphorus present either as self-supporting links or as loadings and they can consist of one or more colored «« · substances in any combination to be sawn in order to to get the desired balance «In a similar way can change the. (MrHl of the reflected laser radiation are duroh well-dosed * linbaw "inert" ingredients in the Leuehtphosphor. For example, a film agent such as talc provides an increase in the iss ratio of reflected to converted energy.

009849/1372

BATH ORIGINAL '

jt.

The invention is marked in the requests and in the drawing explained in detailf show it

fig. 1 is a diagram showing the dependency the percentage intensity of the emission spectrum and the associated excitation » spectrum of the wavelength in micrometers for unmodified cerium doped YAG,

fig. 2 is a diagram showing the dependency the relative smiasion intensity τοη the Wavelength in Angstroms for exemplary arbsuhstanzen, excited at 4,880 Angstroms,

lig · 3 is a chromatic diagram showing the coordinates shows various particularly useful luminous phosphor * emissions, and

4 an oblique view of an invention System.

Yes rig. 1 shows the data for aas laispionsspektru »and the hereby in ltsiehuag« Anrefungsspektru »for cerium dopeda TAQ _t Daa Baissionsspsktriut is shown by the dashed curve and has a broad spectrum of interest here at a wavelength of about 0.55 micrometers. The associated excitation spectrum, which is represented by the drawn curve, is a measure of the emission intensity as it occurs for various excitation freciUQnzen. The most pronounced

009849/1372

- 7-2025240

The excitation peak falls with an excitation wavelength of about 0.46 microns together. The emission wavelengths for two main laser lines are also shown. The first is at 0.488 microns and stirs from an argon ion laser. The second runs at 0.4416 microns and is powered by a cadmium icnene laser here. The laser lines are shown as solid vertical lines.

In Pig. 2 shows the emission spectra for two organic luminophore and their 50150 mixture. The color substance types are 4-aaino _} 1,8-bapthal-p-xenylimide (peak at 5,300 angstroms, curve A) and rhodanine (peak at 6,050 angstroms, curve B). Both fluoresce at an old high efficiency (greater than 50Jt) at 4,880 Angstrom excitation. The dashed curve is the course of the emission intensity for a granular 50i5O mixture of these two luminous phosphors Addition of reflective substance to increase the fraction of the reflected 4 * 880 Angstrom laser radiation, for example if this argon ion laser radiation is used. The overall effect is therefore that of obtaining a whiter

appearing color fig. 3 shows the internationally used CIB Chromasie diagram (see Applied Opticsι A Guide to Modem Optical Systea Design, J. Wiley & Sons 1968, Chapter 1 of

009849/1372

L. Levi), which can be used as a yardstick for assessing the color quality of an image display system.In this diagram, the saturated (monochromatic) colors are arranged on the circumference of the horseshoe-shaped curve, while colors with decreasing saturation approach the point of light Ϊ, the white colors eats as this corresponds to the average daylight illumination. Every actual color - regardless of its spectral composition - can be represented by a single point within this diagram. A straight line that connects any two points (primary colors) represents the geometric location of the possible colors, as can be obtained by mixing these two primary colors in different proportions. In a similar way, the overall possible colors, which are obtainable overall through the combination of more than two primary colors in a respectively changing composition, lie within the polygons defined by the connecting lines between adjacent primary color points. As an example, a triangle is drawn in dashed lines in FIG. 2, which includes the color scale of a shadow mask color LOCATION. Vergleiohozwecken to the main lines of a cadmium and a A _r gonlasers at 4,416 Angetrüm, located Angotröa 4.880 and 5.145 Angetröai that Emiseionelinie of cerium dotierterr YAG and three organic dyes (öboiioo on the Baoio of 4-amino, 1,0 ' Hapthel "p * <zenylimid) and luminous phosphors (34ßi>, 5493 and 3404" the pigments on KhodamiiibasiB wind) Dar Pfeil at 3485 An £ ßstro »~ FarVütoffti» i £! 0ion aeitfi- ümi Iiiniluss an ex * addition of Phlhaloci ani n-löner, who ($ o lüHßiire \ fellenlnngR

BAQORiQlNAU

~ ⁹ "20252A6

yellow and red emission TeLl _f selectively absorbed a lebhafteroa griin to generate, Bs is appreciated daß.die combination of Liohb of each of the blue laser and the LichtquelLon Emiösion of the at 3.483 Angstroms "and 3,405 angstroms phosphorescent light-emitting phosphors to a Color scale similar to that of a color cathode Brahlröhro for »

A black and white gift can be achieved by scanning the exposure to the viewing screen a mono-ohromabic laser beam, with the biohield with a suitable ton Hiöchimg of Leuchtphoöphoren and direct scattering materials such as powdered magnesium " oxide or talc is coated. For example, a Combination of the scattered Liohb of a blue argon ion · Laaero beam (4 »880 Angstrom) and one from blue to red umgesebi ', th light one of the Rhodaain ^ dye ^ luminescent phosphore can produce a white appearance that the straight line showing these two primary colors on 4ea Chromasie diagram connects, “or closer to the white point C passes by.

A combination of more than two primary colors can also be used can be used to generate white · For example a light path of a CD heating laser that has a correctly set Mixture of magnesium oxide and dye "Iieuoht" phosphors (3,484 Angstroms and 3 x 485 Angstroms) aaän required be to get white. Alternatively, the magnesium *

00 ** 49/1313 :: '

oxide can be replaced by pyrelene-containing Mator Lallen or by mnberials containing 7-diethylamino, 4-methylcoumarin (blue-to-blue or ultraviolet-to-blue converting light phosphors), to completely eliminate a blemish.

Regardless of how many phosphors are used, It is evident from the Cliromasie Diagranim that a necessary condition for obtaining an actually whitish-colored It looks like that the illuminating laser beam has a wavelength of approximately 4,950 angstroms or less. Otherwise it is impossible to get the chisel point C inside of a polygon whose primary colors are the source and is any combination of longer wavelengths that can be achieved by winding down the frequency » Oily, the argon ion liner fulfills this need- » agile condition. Pig. 4 shows a simple one in oblique form System according to the invention. Sas..Excitation light comes from one Laaer 10 generated, for example, an argon! Onen ^ laser or can be a cadmium ion laser. The light beam 11 emerging from the bar first enters a modulator 12, which is connected to it a modulation signal by means not shown is supplied for amplitude modulation of the beam. The modulation can, for example, be based on electro-optical *! acuBtο-optical or magnet © optical path *

A description of suitable acousto-optic devices can be found in Beal System leelmical Journal _9, Volume 46, page 367 - February 1967. A consideration of suitable electro-optical devices can be found in Journal ef Applied Physios, Volume 38, pages 1611-1617. March 1967 »U9o49 / 1372

In either case, the modulation can be accomplished by changing the total amount of light of a particular one Polarization sense, which is transmitted by an analyzer located in the modulator, or alternatively through Controlling the amount of light that is deflected acousto-optically »

After exiting the modulator 12, the beam, now designated 13, enters a deflection unit 14, which the appropriate horizontal and vertical deflection

for example to act on the screen in zones 15 (. The deflection unit 14 can advantageously be on acoustooptißchor Banis illuminate, see for example Proceedings of the IEEE, Volume 57, page 160, February 1969 · The deflection unit 14 can also perform the modulation function take over, so that the need for a separate modulator 1? not applicable «Use previous distraction systems mechanical * motor-driven in some cases Scanning units.

The essence of the invention is based mainly on the nature of the luminous phosphor Schlras 15, like this la overall system built-in eats. Laaer picture reproduction systems of the general Correspond to nature! Fig. 3 "are described in" 1 in greater detail in the existing scientific literature. See, for example, IEEIi Spectrum, Deceaiber 1948, Soiten 49 ff.

The chettdscha nature of this SiclrtHohirBS is in the following- * which is explained in detail,

'0.09049 / 137?

One embodiment of the system according to the invention is based on a phosphor screen containing trivalent cerium in a suitable host lattice. The emission of Ce ^ is generally in the near ultraviolet can be shifted into the visible. As can be seen from FIG. 1, the emission for YAGrCe ^{3+ is} quite broadband, with a peak at about 0.55 micrometers (yellowish white). The absorption peak in this grating is centered at about 0.46 micrometers and this absorption spectrum is suitable for use in conjunction with both the argon laser stimulated at 0.4084 micrometers and the cadmium laser stimulated at 0.4416 micrometers. As explained below, there is no particular advantage if the absorption is shifted so that it coincides exactly with the Lauerem! Oßlon *

While in the present "Absorpltonnspoktimm" reference has been made, only the absorbed energy, which is converted into a visible radiation emission as described, is of importance for the purposes of the invention Hand eiπae excitation spectra are represented, and it is theee «spectrum that the Piß. 1 reproduces.

IJais Atiregiu ^ rr-pclttmuB in the 0er endowed garnet can be used to

f »n ο.ί-r. (■■ rwßlmie.n Liv: wt7fn; n vfepßehebeai ws 0 0 9 0 i, 0/1 3 1 '> ■

BATH ORIGINAL

but also for adaptation to other laser sources. For this purpose, the basic composition Y ₅ Al ₅ O ₁ «χ by partial or complete substitution with gallium for aluminum and / or with gadolinium for yttrium. The former has the effect of shifting the excitation peak to shorter wavelengths, while the latter has the opposite effect · The peak of the excitation spectrum can be varied in this way within the range of about 0.33 micrometers to about 0.48 micrometers; however, useful excitation can also be accomplished over the broader range of about 0.30 to 0.53 micrometers.

A shift in the excitation spectrum creates an accompanying shift in the emission spectrum, where the Area of the emission peaks between about 0.51 micrometers and 0.61 micrometers. For the preferred embodiment designed to be white or nearly white To generate an image, the emission peak should not be at wavelengths less than about 0.52 micrometers. (This corresponds to an excitation peak of about 0.43 microns, which occurs with a YAG composition, which is modified by a substitution of 45 atomic percent gallium for aluminum ·) From the same point of view From this preferred embodiment, the phosphor should not be modified in such a way that a Excitation peak at wavelengths greater than about 0.58 Micrometer occurs (or more precisely that the excitation should not exceed this limit), since itself an ineffective one Conversion to some additional light with longer wave

009 849/137 2

length and therefore gives the reflected emission a yellow tinge. YAG, in which 70 atomic percent Yttrium are replaced by gadolinium, corresponds to this condition, and therefore this represents the maximum uncompensated partial substitution with gadolinium for is the preferred embodiment.

Luminescent phosphorus compositions which are suitable for the invention Purposes are based on the cerium activation suitable cerium range is from about 0.001 to about

™ 0.15 atoms per formula unit of the Grantos, based on the stoichlometry Y ₅ AIcO ₁₂ . (De ^ ⁺ takes the place of yttrium and therefore reduces the required amount of yttrium by the same amount) The lower limit of the cerium content represents the minimum concentration which still led to an easily recognizable re-emission image, while the maximum approximately coincides with the sweetness border in the garnet. A preferred cerium range is between 0.005 and 0.10. The lower ßrens® is based on the minimal

φ concentration required for a re-emission image is that can still be seen in normal brightness, and the upper limit results from the fact that one further increase only lead to slightly better results » The upper preferred limit is therefore based mainly on economic considerations.

In view of these considerations, the Office of the Assembly this phosphor can be written as follows:

009843/1372

lie therein

χ between 0.001 and 0.15, or in the preferred range,

between 0.005 and 0.10
y between 0 and 2.999 and
ζ between 0 and 3.0.

Certain other substitutions are possible «For example Lutecium or lanthanum can be substituted for yttrium, and indium or scandium can partially replace aluminum. However, there are suitable excitation and emission spectra in the Ublichoron and more economical YAG or substituted YAG system can be obtained is not to be expected that further modifications may be of commercial importance will. .

A further AusffUirungsform the invention is based on a Leuchtplionphor Schirot, the at least one fluorescent organic dye or a. JTluorescent organic pigment content. Sample materials and the colors in which they fluoresce, aind pyrelin (blue); Fluorescein (yellow b (ji i \ n)} Eosin (gelOf IUiodamin-B (red); Rhodamine-6G (gel) t / icridln (blue) f Acriflavin (yellow-green) j Napthaliurot (red) j / uromin-O (ßelligrtin ); 4-Amino. 1,8-Hapthal-p-xenylimi.d (yellow-green) and .7-Dlailty3aml.no, A-Kcthylcoumarin (blue). Other dyes are xanthene, azine, (lxarin _{ thipzin, acridine,

00984a / 1372

Flavin, napthalimide and coumarin and their derivatives. The absorption and emission data of selected dyes are given in Table 1. Such data can be used to optimize the screen composition for a given laser source

to be used.

Table I.

Absorption and fluorescence bands of dyes in aqueous or alcoholic solution (approximate band limits in angstroms; band tips in parenthesis)

links

I xanthenes: Fluoran

1. Absorbance band

UV Fluorescence tape color

Fluorescein 4400-5200

(Dihydroxyfluorane) (4940

Eosin 4500-5600 (tetrabromofluorescein) (5170J

Erythrosine 4600-5560

(Tetraiodo- (5165) fluorescein)

Rose bengal

(Tetraiodotetra-

chlorofluorescein)

Rhodamine B extra Rhodamine 6 G Acridine red Pyronine B

IZ. Acridines: Acridine

Acridine yellow Euchrysin

(5438)

4800-6000 (5500)

4800-5900 (5260)

4550-6000 5400-5900

3000-4500

ÜV-5200 UV-5400

009849/1372 2900-4600 (3200)

5100-5900 (5180)

5200-6000 (5400)

5180-5880 (5375)

5500-6700 (6000)

5500-7000 (6050)

5360-6020 (5550)

5600-6800 5600-6500

4000-4800

4750-6400

5050-6700 (585o)

violet strong

yellow-green very strong

yellow strong

yellow weak

orange

very weak

red strong

yellow strong

orange medium

orange

middle

blue-violet medium

green·

greenish yellow green medium

2 O 2 5 2 A 6

links 1. absorption
tape fluorescence
Ribbon color green
weak Rheonin A UV-5100 4700-6500 yellow-green
strong Acriflavine
(Trypaflavin) UV-5000 4850-6600 III. Azines .: Red
strong Magdala Red 4000-6000
(5240) 5500-7000
(6000) yellow Red Saffranine (5390) IV. Thiazines: orange
middle Thionine 4800-6300
(5800) Red Methylene blue 5500-7000

middle

A napthalimide dye, 4-amino, 1,8-hapthal-pxenylimide (yellow-green), and two rhodamine dyes (orange and red) are exemplary. For an excitation of 4,880 angstroms, their emission spectra have peaks at 5,300 angstroms (yellow-green), 6,050 angstroms (orange-red) and 6,200 angstroms (red). It has been found that the lifetimes in the excited state of these dyes are all considerably less than a microsecond and that their absorption cross-sections are so large that the entire laser beam is absorbed within a thin file approximately 0.1 mm thick. Their absorption bands are quite wide and encompass practically the whole violet and blue area and also part of the green area · It has been estimated that the quantum efficiencies are above 50 % · Therefore these materials are well suited for laser imaging systems.

009849/1372

The colors of these fluorescent dyes can be modified somewhat by using the one used to form the pigment Carrier type is varied, and to a lesser extent by varying the type of binder, in which the pigment is incorporated. It is also possible to change the colors by combining the fluorescent dyes to modify with such non-fluorescent dyes which selectively absorb part of the emission spectrum. For example, the emission spectrum of the napthalimide dye (type 3485) shown in Fig. 2 has one Peak at 5,300 angstroms in the green area · Normally this fluorescence appears yellow-greenish, because of the broad flank of the emission spectrum, which extends into the yellow and red range »However, this Flank can be significantly reduced by adding a non-fluorescent In greens like phthalocyanine in "the yellow and" plumb absorbed. Here..must the decrease in the brightness in the fluorescence and dfrren limitation caused by it weighed up on a starred spectral hit will·

In contrast to the numerous yellow and red emitting Dyes are less common with bUuiemittierend® dyes. However, studies on pyrelin in dilute alcoholic solutions show that building fluorescence in a Excitation by short-wave blue light, for example the 4 · 579 AngstrÖm emission line of an argon laser or the 4,416 angstrom line of emission of a cadmium laser, while green fluorescence occurs when with

009849/1372

longer-wave blue light is excited, for example with the 4,880 Angstrom emission line of an argon laser. Also, coumarin pigments are used when stimulated long-wave UV light fluoresce blue, commercially available.

In individual cases it may be desirable, even colored ones or to produce non-white images, but the more significant aspect of the invention is in the production of white or nearly white images.

With the unmodified YAG: Ce system, when using from an argon or cadmlum laser to sum up white images, if the secondary yellowish emission is caused by a certain reflection of the shorter-wave laser emission radiation is compensated. Under these circumstances it is desirable to design the layer thicknesses and compositions so that or to provide a certain reflection so that total absorption does not occur. The one with one Argon or cadmium laser working system, white images can be obtained by composing the screen is set to a yellow color, so that the additional reflected blue light leads to a white image

However, a suitable selection among the luminous phosphors can also be made in such a way that there is no compensation Required is · This can be accomplished, for example are made by mixing blue-, yellow- and red-emitting luminous phosphors, which are present in köaiger form. Gallium,

Aluminum can be partially in the range of 20 to 60 %

009849/1372

20252A6

per formula unit to be substituted in the YAG: Ce system · Under such circumstances, the fluorescent layer is designed in such a way that that it leads to little or no reflection at all · This can be achieved by one for practically complete absorption and for minimal Reflection ensures.

In a set-up test arrangement, images that appear white were obtained using the composition Y «qgC ^e o 01 ^ 5 * 12 '^ ⁸ "" ¹ ^ e found that approximately 50% of the energy of a one watt 0.488 micrometer argon emptier beam was found in a Layer thickness of about 0.4 mm was absorbed. The image could be further intensified by providing a mirror backing, whereby a total absorption (within the excitation band) of about 75 # of the laser energy was achieved «The remaining 25% of the laser energy were sufficient to compensate for the yellow tint of the re-emission.

Obviously, the final design of a fluorescent screen depends on the power, the laser wavelength, the Absorption of the luminous phosphor and the emission wavelength. The reflection of unreacted laser light can are reinforced by using thin layers, by reflective backings (although this also leads to a additional secondary emission during the crossing on the way back) and by incorporating "inert" reflective materials such as talc ·

009849/1372

Claims (1)

'20252Λ6 Claims 1. Image display device with a laser operating at a Stimulated wavelength emitted in the visible spectrum, a first device for amplitude modulation of the laser output beam, a second device for Deflection of the beam and a screen, characterized in that the screen is a layer of a Has phosphorescence composition. 12.) Arrangement according to claim 1, characterized in that the phosphorescent composition consists mainly of a material represented by the formula. ^Y 3-xy ^Ce x ^Gd y ^A1 5-z ^Ga z ^o i2 is shown in which χ is between 0.001 and 0.15, y is between 0 and 2.999 and ζ is between 0 and 3.0 3 · Arrangement according to claim 2, characterized in that the laser emits stimulated at a wavelength between 0.1 and 0.53 micrometers and that the phosphorescent composition has an Enisaionespitze at about 0.55 micrometers 4 · Arrangement according to part 3, characterized in that the phosphorescent composition and the Schlra structure like that - elected that part of the emitted light is not implemented in such a way that the combination of the reflected Lmierlichtee and the re-emitted from the screen 009849/1372 appears almost white » 5 · Arrangement according to claim 3, characterized in that the phosphorescent composition consists essentially of consists· 6. Arrangement according to claim 1, characterized in that the phosphorescent composition mainly consists of at least one organic coloring substance. 7. Arrangement according to claim 6, characterized in that the laser _{emits stimulated at a wavelength between O 9} 3 and 0.53 micrometers and that the phosphorescent composition gives the visual impression of a practically white fluorescence. 8. Arrangement according to claim 7 »characterized in that the phosphorescent composition and the screen structure are chosen so that part of the emitted laser light® » is not implemented in such a way that the combination of the reflected. Laser light and the reacted The fluorescent light on the screen appears almost white. 9. Arrangement according to claim I _9, characterized in that the phosphorescent composition contains at least one fluorescent organic component, which consists of the compounds on coumarin, xanthene, acridines »rhodamine, Naphthalimide, azine or thiazine bases are selected. 009849/1372 10. Arrangement according to claim 9, characterized in that the component is selected from pyrelen, 7-diethylamino-4-methylcoumarin, rhodimine B, rhodamine 6G, acridine, 4-amino-1,8-xaphthal-p-xenylimide 11 · Arrangement according to claim 7 »characterized in that a electro-optical modulator and an acousto-optical deflection unit are provided as the first or second device 009849/1372 Blank page