Abstract: An evanescent wave sensor and method for use in analyzing one or more media, the sensor including a waveguide having first and second wave propagating surfaces. The waveguide propagates an input signal along the waveguide between the first and second surfaces. The first surface receives a first radiation signal which indicates the presence of a first analyte, and the second surface receives a second radiation signal representing one or both of a second analyte and a reference. The first and second surfaces can both be contacted with a single medium, or with two separate media, and one or more output signals can be detected.

Abstract: An optically active device comprising an optical fiber, a light source and a coupler is disclosed. The optical fiber has a core made of a silicate glass containing Rb and/or Cs oxide. The core is doped with Nd.sup.3+ as an active ion and transmits light at 1.3 .mu.m band. The light source generates excitation light at 0.8 .mu.m. The coupler directs the excitation light from the light source into the core of the optical fiber. A signal light or a spontaneous light at 1.3 .mu.m band which is transmitted in the core stimulates Nd.sup.3+ to emit light at 1.3 .mu.m band. As a result an optical function such as optical amplification can be effected at 1.3 .mu.m band.

Abstract: Previous efforts to measure polarization dependent loss of optical components have been limited in uncertainty to more than 0.01 dB. This is because the power meter used in a test set contains polarization dependent loss which adversely affects the final readings. It is here disclosed that an unpumped erbium doped fiber can convert a received polarized signal into unpolarized amplified spontaneous emission of a longer wavelength if the fiber is of sufficient length to absorb the received signal. By locating the inventive unpumped erbium doped fiber upstream of the power meter of a test set, the polarized signal to the power meter is coverted to an unpolarized signal and, therefore, the polarization dependent loss of the power meter can not influence the measurement obtained.

Abstract: A light waveguide lead has at least one light waveguide accommodated within a protective sheath and this light waveguide is embedded in a pasty filling compound characterized by small balls being added to the compound, which balls are composed of a different material than the filling compound material. The diameter of the small balls and the number are selected so that the light waveguide has a displaceability within the filling compound that is adequate to allow stranding in other processes to the light waveguide lead.

Abstract: A fully integrated electro-optic page-scanner comprises an optically-transparent waveguide made from an electro-optic polymer formed as a Langmuir-Blodgett film, and a linear array of electrically-addressable, spaced, parallel electrodes for selectively altering the refractive index across pixel-sized portions of the polymeric waveguide. Parallel addressing of the electrodes in accordance with the intensity pattern of a line of pixels to be recorded acts to modulate the phase front of an optical wave propagating within the waveguide in accordance with such line intensity pattern. Schlieren optics, also integrated with the page-scanner, convert the phase-front-modulated wave to an intensity-modulated pixel pattern which can be imaged onto a moving photosensitive recording element to record a two-dimensional (page) of image information. By using an electro-optic polymer formed as a Langmuir-Blodgett film as the waveguide, certain disadvantages of prior art scanning devices are eliminated.

Abstract: Deuterated organic salts useful in nonlinear optical applications are disclosed herein. More particularly, optoelectronic devices and systems are prepared from said deuterated organic salts and the preferred salt is perdeuterated 4'-dimethylamino-4-methylstilbazolium p-toluenesulfonate.

Abstract: A lossless optical component includes an input and at least one output. The optical component includes an operational portion and an amplifier portion upstream of the operational portion. The amplifier portion includes an optical amplifier for amplifying optical signals received by the input. The optical amplifier is provided with input optical waveguide via which the optical amplifier is optically pumpable by a remote pump laser. The output of the optical amplifier is proportional to the loss of the operating portion of the optical component.

Abstract: An optical waveguide is created using the process of ion beam deposition resulting in a waveguide with low propagation loss, mode discrimination, and gain characteristics. The waveguide is made up of a multilayer stack which is deposited upon a thermally stable substrate, wherein the multilayer stack comprises alternating layers of a first material and a second material. The layers of second material are doped with a rare earth material. By pumping the waveguide with a pump light source, interaction between the pump light and the rare earth material within the waveguide causes amplification or gain of a first optical signal. Ion beam deposition is used to fabricate the waveguide, therefore production of a high quality rare earth doped waveguide is possible. Furthermore, the waveguide is made using batch processing thus reducing costs.

Abstract: An optical, waveguide, quasi-phase-matching frequency converter has integral means to vary the efficiency of the quasi-phase-matching frequency conversion process resulting in intensity modulation of the device output; said frequency converter has integral means to optimize the quasi-phase-matching frequency conversion process resulting in optimum device output; and said frequency converter has integral input signal polarization mode conversion means in optional combination with the conversion optimization means for modulating the optimized device output. Methods for modulating and optimizing the quasi-phase-matching frequency converted signal by electro-optically controlling the dispersion of the frequency converting medium are also disclosed.

Abstract: The invention relates to optically transmissive, silica-containing compositions which exhibit a small change of refractive index with respect to temperature changes (dn.sub.g /dT). The compositions are derived from silica sols dispersed in liquid organic polymers. The invention relates to optical systems comprising a plurality of elements that are optically interconnected by means of the inventive composition. An especially preferred embodiment of the invention is the use of the composition within a connector to simultaneously align and join optical fibers.

Abstract: Optical fibers and glass composition comprising a mixture of barium oxide, gallium oxide, germanium oxide, and a modifying agent selected from lanthium oxide, indium oxide, and mixtures thereof; molar ratio of barium oxide to gallium oxide is from about 4:1 to about 1:1, preferably 2:1 to 1, and especially about 1:1; amount of germanium oxide is at least 40 mole percent, preferably 60 to 95 mole percent, and especially 65 to 90 mole percent; about 0.1 to about 5 mole percent, preferably 0.5 to 4, of gallium oxide is replaced with the modifying agent. The optical fibers made from the glass composition defined herein, with or without the modifying agent, have light transmission wavelength band of about 0.3 to 4 microns; lower optical loss than silica-based optical fibers, the minimum optical loss of the novel fibers having the potential of 0.05 dB/km at 2 microns.

Abstract: An optical waveguide is formed by depositing multiple layers of thin films using the process of ion beam sputter deposition. The waveguide is made up of alternating layers of a first material and a second material wherein the two materials have differing indices of refraction and low optical loss. These materials are deposited upon a thermally stable substrate creating a multilayer stack which functions as a waveguide. The multilayer waveguide has ultra low propagation losses and good mode discrimination, thus being very efficient for use in single mode applications. The waveguide is easily adaptable to batch processing which reduces costs and increases the performance of the waveguide.

Abstract: Optical sensors for physical parameters use a parameter-dependent relative distribution of the intensity of interrogating light of wavelengths .lambda..sub.1 between two light-guiding regions of a light-guiding probe. The relative distribution can be determined by a plurality of means including the spatial separation of the lights carried by the two light-guiding regions, and/or the conversion of one of the lights into light of wavelengths .lambda..sub.2 different and easily separable from light of wavelength .lambda..sub.1. The sensors can be adapted to measure diverse physical parameters, including but not limited to temperature, and to measure infrared radiation by measuring its heating effect on the sensing probes.

Abstract: A substantially dry method for making an optical waveguide device with at least one buried channel waveguide in a laminated and hardened matrix. The method begins with exposing to light a region of a substantially dry photohardenable film adhered to a support. Then a first substantially dry photohardenable layer which is adhered to a support is laminated to one side of the film. Then the support is removed from the film. Then a second substantially dry photohardenable layer which is adhered to a support is laminated to the other side of the film. Then the layers and film are hardened.

Abstract: The use of a multi-functional, chromophore containing, polymerizable compound for producing an optical element having non-linear optical properties (an NLO element) wherein the multi-functional chromophore is a compound capable of being polymerized into a cross-linked network and of being poled under the influence of an electric field whilst being polymerized into the cross-linked network, the compound having the generalized formula(D) (C) (A) (F)D, C, A and F representing covalently linked moieties where C represents at least one conjugated system of .pi.-bonds,A and D represent at least one respectively .pi.-electron acceptor and .pi.-electron donor groups linked at opposite ends of the conjugated system, and are preferably conjugated with the conjugated system of .pi.-bonds (C) and where more than one moiety A, C or D is present they may be the same or different,F represents at least two polymerizable functional groups, which may be the same or different, attached to the .pi.

Abstract: A cable of this invention includes a core comprising a plurality of coated optical fibers and a filling composition of matter which is disposed about the fibers. Typically, the fibers and the filling material are diposed within a tubular member which is disposed within a sheath system. The sheath system include longitudinally extending strength members and a plastic jacket. The filling composition which fills interstices in the core is one which includes an oil constituent which is a relatively high molecular weight aliphatic hydrocarbon. The aliphatic hydrocarbon is a synthetic oil such as polyalphaolefin or mineral oil. A relatively large percent by weight of an antioxidant system is used to prevent thermal oxidative degradation of the filling material as well as of materials in contact with the filling material. Advantageously, for stabilization and metal deactivation, the composition includes zinc dialkyldithiophosphate or diaryldithiophosphate.

Abstract: Manufactured is a non-linear optically active (NLO) device, an optical waveguiding structure being formed which comprises at least a layer of an NLO polymer containing hyperpolarizable groups, and the NLO polymer being exposed, with heating, to an electric field for poling of the hyperpolarizable groups, the heating being by contacting the NLO polymer with a thermal energy generating live electric conductor (a resistor wire). Preferably, the live electric conductor also functions as electrode when generating the electric field with which the hyperpolarizable groups are poled. The invention further relates to a device comprising an optical waveguiding structure and electrodes for electro-optically affecting light coupled into the waveguide. The live electric conductor used in the manufacture also functions as an electro-optical effect generating electrode.

Abstract: An optical electronic component, in which strip waveguides of limited depth and lateral width are formed in undoped dielectric substrate, e.g. an undoped crystal, by implantation of rare-earth ions or ions of transition metals, preferably laser-active ions with energies of 50 keV to 10 MeV.

Abstract: An improved optical fiber for transmitting mid-infrared wavelength laser light in surgical instruments, includes, a heavy-metal oxide component, preferably GeO.sub.2 doped with heavier cations and anions, is capable of delivering of at least three watts of laser power continuously for more than ten minutes, without failure. This glass fiber has an .alpha.(dB/m) at 2.94.mu.m of 10, preferably less, and can transmit at least 27% of the IR through a thickness of one foot.

Abstract: Homopolymers and copolymers with an acrylic backbone chain having pendant side-chains containing a nitrone functional group undergo change in refractive index upon exposure to actinic radiation. Waveguides are "written" in films containing such polymers by exposing predetermined areas to sufficient actinic radiation to change the refractive index.

Abstract: We have discovered that silica-based optical fibers that are doped with Ge, Al and a rare earth (e.g., Er) can be very susceptible to hydrogen-induced attenuation change. For instance, such fiber can exhibit loss increase rates that are, at 20.degree. C., 10.sup.6 times larger than those of a standard single mode fiber. We also believe that transition metal-doped silica-based fibers can exhibit large hydrogen-induced attenuation change. In many circumstances (e.g., amplifier fiber, attenuator fiber) significant attenuation change of optical fiber is undesirable. We disclose that such change can be substantially eliminated by provision of hydrogen gettering material and/or a "hermetic" fiber coating. It is currently preferred to provide silica cladding material that is a hydrogen getter, and also provide a "hermetic" fiber coating. Containment of the fiber, together with a quantity of a gettering material (e.g., ErFe.sub.2) in an essentially hermetic enclosure is also disclosed.

Abstract: A molded optical waveguide having electrical conductors molded therein for contacting an optical device mounted at one end of the waveguide and providing external electrical access to the optical device at exposed sides of the waveguide. The waveguide and assembled optical device is mounted on a printed circuit board or the like and contacted by lead wires.

Abstract: A process for producing an optical fiber having enhanced radiation resitance is provided, the process including maintaining an optical fiber within a hydrogen-containing atmosphere for sufficient time to yield a hydrogen-permeated optical fiber having an elevated internal hydrogen concentration, and irradiating the hydrogen-permeated optical fiber at a time while the optical fiber has an elevated internal hydrogen concentration with a source of ionizing radiation. The radiation source is typically a cobalt-60 source and the fiber is pre-irradiated with a dose level up to about 1000 kilorads of radiation.

Abstract: A color-coded hermetically coated optical waveguide, consisting of glass optical fiber incorporating a light-absorbing hermetic coating but exhibiting improved color stability and differentiability, is produced by interposing a pigmented white opaque polymer coating exteriorly of the hermetic coating and interiorly of the color coding ink, the pigmented coating operating both to mask the hermetic coating and to accentuate the brightness of the ink color.

Abstract: A waveguide is formed by performing epitaxial growth of .beta.-BaB.sub.2 O.sub.4 on top of .alpha.-Ba.sub.1-x Sr.sub.x B.sub.2 O.sub.4 (where 0.04.ltoreq.x.ltoreq.0.10). A nonlinear optical waveguide device using .beta.-BaB.sub.2 O.sub.4 can output a highly converted laser beam.

Abstract: Optical waveguide amplifiers and lasers having a novel fluorescent dopant distribution are disclosed. Exemplarily, in a Si-based optical fiber the fluorescent dopant (e.g., Er) has an annular distribution, with the concentration maximum not at the center of the core but typically between the center and the core/cladding interface. The novel waveguides can be relatively insensitive to variations in cut-off wavelength and/or modal distribution of pump power.

Abstract: The present invention relates to new palladium-containing polymer compositions which are characterized by a very finely disperse distribution of metallic palladium, and to the process for their preparation. Palladium-containing polymer compositions containing polymers with unsaturated groups are used inter alia as hydrogen absorbent compositions in the production of fibre optic cables for the purpose of protecting the optical fibres against hydrogen. As is well known, the diffusion of hydrogen into optical fibres has an adverse effect on the damping properties of the optical fibres.

Abstract: Nonlinear-optic (NLO) compositions containing functionalized merocyanine dyes, such that the molecules, comprising the NLO-active compositions have a functional group at each end of the molecule and each functional group differing in reactivity, thus permitting stepwise reaction of each functional group, and NLO-active molecules prepared from hemioxonol dyes derviatived with (meth)acrylate or (meth)acrylamide groups, and their uses in devices such as second harmonic generators or polymer integrated optics.

Abstract: There is described a semiconductor microcrystallite doped glass that exhibits SHG, and a method of preparing, or encoding, a semiconductor microcrystallite doped glass by the simultaneous injection of fundamental and second harmonic fields, such as 1.06 .mu.m and 532 nm. More specifically, the disclosure pertains to a structure that exhibits SHG, the structure being comprised of, by example, borosilicate glass that contains CdS.sub.x Se.sub.1-x microcrystallites. Also disclosed are embodiments of devices having an optical waveguide structure formed within a glass substrate that contains semiconductor microcrystallites. The optical waveguide structure guides and contains injected radiation and also converts a portion thereof to the second harmonic. Also disclosed are optoelectronic devices that include frequency doublers, self-doubling lasant material, bichromatic optical switches, and a volume holographic medium, all of which include a glass host having semiconductor microcrystallites embedded within.

Abstract: An overclad fiber optic coupler of the type wherein a plurality of optical optical fibers, each having a core and a cladding, are fused together along a portion of the lengths thereof to form a coupling region. Surrounding the coupling region is a matrix glass body of refractive index n3 which is lower than the fiber cladding refractive index n.sub.2. The body has an inner region adjacent the optical fibers, an outer region having a radius greater than that of the inner region, and a transition region between the inner and outer regions. The softening point temperature of the inner region is greater than that of the outer region. The coupler exhibits both low polarization dependent loss and low excess loss.

Abstract: An optical article is disclosed comprised of a support including a portion adjacent one major surface which is transparent to the electromagnetic radiation sought to be propagated, an organic layer unit capable of converting a portion of polarized electromagnetic radiation of a selected wavelength to its second harmonic wavelength, means for optically coupling into said organic layer unit polarized electromagnetic radiation of a selected wavelength in its zero order transverse magnetic mode, and means for receiving from the layer unit a portion of the electromagnetic radiation in the form of a first order transverse magnetic mode. The organic layer unit has a thickness which is at least 70 percent cf the wavelength of the zero order transverse magnetic mode and differs by less than 100 .ANG. from the thickness required for identical propagation constants of the zero and first order transverse magnetic modes.

Abstract: An optical amplifier using either rare-earth doped optical fiber, which can amplify an optical signal when a pumping light is injected, or a laser diode amplifier, which can amplify an optical signal by injection of an electric current. The amplifiers being of simple construction and having a gain which can be maintained constant through feedback control based on the detection of spontaneous emission from the sides of either the rare-earth doped optical fiber or the laser diode. The control being performed without the need for detection of input or output optical signal of the optical amplifier.

Abstract: This invention comprises the use of diacetylene-containing polymers, e.g., olyamides containing reactive diacetylene groups that change their absorption in the visible spectrum with the application of strain as a strain sensing device in various organic matrix composites such as an epoxy laminated composite. The built in sensors in accordance with this invention will not affect the mechanical performance of the composite and will indicate strain without the need for extensive electronic equipment to measure the light pulse amplitude or phase before and after strain.

Abstract: An optical waveguide fiber with a core region 1 and a cladding region 2, wherein the cladding region 2 includes an outer cladding region 3 is disclosed wherein the outer cladding region 3 is a very thin (less than 1 .mu.m in thickness) layer of TiO.sub.2 -SiO.sub.2 glass which results in a substantial reduction in the number of fiber breaks resulting from the fiber drawing process and having a predetermined TiO.sub.2 concentration less than or equal to about 10 wt. %. A method for making the fiber is also disclosed.

Abstract: A large second-order nonlinearity (.chi..sup.(2) .about.1 pm/V.about.0.2 .chi..sup.(2).sub.22 of LiNbO.sub.3) is induced in the near surface (.about.4 .mu.m) region of commercial fused silica optical flats by a temperature (250.degree.-325.degree. C.) and electric field (E.about.5.times.10.sup.4 V/cm) poling process. Once formed, the nonlinearity is roughly 10.sup.3 -10.sup.4 larger than that found in fiber second-harmonic experiments and is very stable at room temperature and laboratory ambient. The nonlinearity can be cycled by repeated depoling (temperature only) and repoling (temperature and electric field) processes.

Abstract: Applicants have discovered that the conversion efficiency of doped glass optical second harmonic generators can be enhanced when the frequency .omega. of the fundamental beam or the frequency 2.omega. of the harmonic beam is chosen near the resonance frequency of an optical transition in the dopant. This resonant enhancement is demonstrated for Tm doped aluminosilicate glass fibers where tuning of the fundamental writing beam to a resonance frequency enhances the second harmonic output by a factor of 10.sup.3.

Abstract: A method for the manufacture of an improved sensor element for determining the amount of oxygen in a sample, comprises the steps of: (a) mixing a fluorescent reagent with a silicone oil which has a molecular weight of 6,700 to 80,000 and most preferably in the range of between 15,000 and 30,000; (b) heating the mixture at a temperature in the range of between 150.degree. to 350.degree. C. and (c) adding an optical insulating material forming an optical insulating layer onto the fluorescent reagent. Optionally, a crosslinking agent is incorporated. In order to increase the efficiency of fluorescence, an additionally layer of light scattering material is inserted between the fluorescent reagent layer and that of the insulator.

Abstract: Unexpectedly large normalized refractive index changes (.DELTA.>10.sup.-5, but possibly even larger than 10.sup.-3) can be obtained in SiO.sub.2 -based optical waveguides (fiber or planar waveguides) by a treatment that comprises exposing at least a portion of the waveguide at a temperature of at most 250.degree. C. to H.sub.2 (partial pressure greater than 1 atmosphere), and irradiating at least a part of the exposed portion with actinic (typically UV) radiation.

Abstract: The present invention provides a method of annealing optical glass layers, said method comprising the step of heating glass layers having an area greater than 0.01 cm.sup.2 to a temperature of between about 350 deg. C. and 1000 deg. C. in less than 10 minutes. The upper limit of the glass area that can be treated is limited only by the size of the quartz chamber. Current state-of-the-art chambers can accomodate glass areas of about 0.01 cm.sup.2 to about 324 cm.sup.2. According to another aspect of the invention, there is also provided an optical waveguide glass layer, treated according to the method of this invention, disposed on an integrated optical device.

Abstract: A hermetically coated optical fiber comprising a core made of glass, a cladding made of quartz glass surrounding the core the outermost layer of which glass contains fluorine, and a carbon layer surrounding the fluorine-containing glass layer, which optical fiber has good initial strength and fatigue characteristics.

Abstract: A method for preparing a material so as to exhibit second harmonic generation for optical radiation that passes through the material. The method includes a first step of providing a bulk glass comprised of substitutionally doped silica and a charge transfer dopant. The bulk glass is prepared for frequency doubling in accordance with a method that includes a step of irradiating the bulk glass with optical radiation having a first wavelength and a second wavelength, the bulk glass being irradiated for a period of time sufficient to obtain a desired amount of conversion efficiency of the first wavelength into the second wavelength. The silica is substitutionally doped with an element selected from the group consisting of Ge and Al, and the charge transfer dopant is selected from the group consisting of Ce.sup.3+, Nd.sup.3+, and Eu.sup.2+. In another embodiment of the invention the silica is substitutionally doped with Ge and the charge transfer dopant is comprised of naturally existing Ge defects.

Abstract: The present invention provides a resin molded body for optical parts, and comprises a solid solution of a polycarbonate and a polyester carbonate.In the resin molded body of the present invention, when the amount incorporated of the polyester carbonate is increased, the light transmission loss is increased, but the distortion temperature is considerably raised and a high heat resistance is obtained.

Abstract: Er and Ti are co-diffused under controlled conditions into a single crystal of LiNbO.sub.3. The co-diffusion is used to produce a light amplifier in LiNbO.sub.3 that is suitable for use in integrated optic devices.

Abstract: Comb-shaped polymers, comprised of hydrophilic backbones and dye-containi hydrophobic side chains are fabricated into multilayered, polarized, noncentrosymmetric, thin films by means of Langmuir-Blodgett processing techniques. These films exhibit harmonic, generated by shining a laser through the film, increases quadratically with the number of layers of polymeric dye in the film.

Abstract: In one embodiment this invention provides a frequency doubling optical waveguide consisting of a substrate-supported polymeric thin film waveguiding layer, in combination with one or more polymeric cladding layers. The waveguiding layer comprises moieties which exhibit nonlinear optical properties as well as anomalous dispersion of refractive index such that, under wave propagating conditions, the effective dispersion .DELTA.N of the waveguiding layer is zero, and the fundamental and second harmonic waves are phase matched over the length of the waveguide.

Abstract: This invention pertains to integration of nonlinear parametric waveguide spectrometer with polyimide waveguide focusing mirror. The waveguide spectrometer uses nonlinear counter-propagating .chi..sup.2 interaction to simulate the action of a grating and produce the required chromatic dispersion. To map the near-field to far-field and separate different wavelength components, an organic-dielectric (e.g. a polyimide/SiO.sub.2) guide and a 45.degree. RIE etched mirror were fabricated to simulate a concave focusing integrated mirror. The measured spot size at the focal plane of the mirror was about 0.7 .mu.m corresponding to about 1.6 Angstroms spectral resolution in agreement with the theoretical prediction. The device has good spectral resolution; however, the conversion efficiency is smaller than the theoretical prediction. Even with the low signal power level, the integrated deviced may be of use in applications that can take advantage of the visible output and do not require high power conversion efficiency.

Abstract: An optical fiber which is enclosed within a polymeric jacket. At least a portion of the jacket material comprises a particulate material which is at least partially soluble in water, such that a solution can be formed which has reduced reactivity toward the optical fiber, relative to pure water. An amount of such material is incorporated in the jacket, sufficient to delay the expected onset of accelerated fiber fatigue in a standard fatigue test by at least a factor of 2 relative to an otherwise similar fiber enclosed within a jacket which is free of the particulate material.

Abstract: A method and apparatus for producing a polymer-clad silica (PCS) optical fiber comprising a core of a transparent inorganic glass and a cladding of a transparent organic polymer characterized in that the amount of volatile components in its cladding is not more than 1 wt %, which method and apparatus comprise forming the core fiber, forming the cladding around the core fiber, and treating the cladding with a far infrared heater.

Abstract: In the optical fiber, the concentration of fluorine doped in the core portion is made nonuniform in the radial direction to be greater at the center portion of the core portion and less at the outer circumferential portion of the core portion. As a result, the distribution of the refractive index of the core portion and the cladding portion before the process of transparent glassification becomes a profile which is high at the outer circumferential portion of the core portion and which is low at the center portion. The reduction of the refractive index at the outer circumferential portion of the core portion due to the dispersion of the GeO.sub.2 etc., the oxide included in the core portion, in the cladding portion in the transparent glassification processed is and as a result, the profile of the refractive index of the core portion becomes one which sticks out in a step form with respect to the cladding portion.

Abstract: A technique for the preparation of an oriented thin film polydiacetylene suitable for use in channel waveguides involves depositing an alignment polymer upon a substrate, rubbing the surface thereof to effect orientation, depositing the polydiacetylene thereon and heating to a temperature just below the melting point thereof.