Matsushita Electric Industrial Co., Ltd.

Masafumi Watari

Masaru Ikedo

Osamu Yamamoto

Hiroshi Tsutsui

Takuhiro Ono

Takeo Miyata

Yoshitake Yasuno

Takashi Iwabuchi

Yoshiaki Hayashi

Tadaoki Yamashita

A method of operating a laser is disclosed which includes irradiating an optical component in an atmosphere of dry air or dry inert gas with a laser beam, wherein the optical component is provided with an antireflection film having at least a layer of calcogenide glass and a layer of potassium chloride or lead fluoride.

Antireflection film

An antireflection film composed of a layer of arsenic triselenide having an optical thickness in the range between 2.518 and 2.783 .mu.m, a layer of potassium chloride having an optical thickness in the range between 1.151 and 1.272 .mu.m and a layer of arsenic triselenide having an optical thickness in the range between 0.577 and 0.749 .mu.m which are successively formed on a member of infrared radiation transmitting material formed of a mixture of thalium iodide and thalium bromide. The member provided with the three-layer antireflection film is used in an atmosphere of protective gas, such as dry air or dry N.sub.2 gas.

An optical fiber which is able to transmit high power infrared energy, and is flexible and long in life is described. The fiber consists essentially of a mixed crystal of 40 to 45 wt % of thallium bromide and the balance of thallium iodide, each having a purity not less than 99.9%. The fiber is free of any particles having a size not smaller than 1 .mu.m.

Optical fiber for infrared transmission consisting essentially of high

An image display device comprises first and second polarizers having their planes of polarizations oriented at right angles to each other and an electrooptic plate of ferroelectric ceramic material interposed between the first and second polarizers. A matrix electrode arrangement is secured to one surface of the ceramic plate to cause crystallographic structural changes to occur under the influence of a locally generated electric field, so that light passing through the first polarizer is refracted by an amount proportional to the magnitude of the electric field and emerges from the second polarizer with an intensity proportional to the electric field. The electrode arrangement includes a plurality of row electrodes and a plurality of column electrodes to define a plurality of elemental picture areas. In each elemental area the electrode arrangement includes a diode, first parallel finger electrodes connected to a row electrode via the diode and second parallel finger electrodes connected to a column electrode and staggered relative to the first finger electrodes.

Image display device utilizing birefringence properties of ferroelectric

A method of thermoluminescent dosimetry employing infrared radiation heating of a dosimeter. An incandescent lamp is used for the source of infrared radiation. The dosimeter is provided with a infrared radiation absorbing layer connected thermally to a thermoluminescent material layer. The infrared radiation absorbing layer is irradiated with infrared radiation, so that thermoluminescent material is not directly irradiated. The lamp is initially powered whereby the dosimeter is heated by infrared radiation of such high intensity as to tend to cause a heat equilibrium in the dosimeter above the temperature where thermal radiation is generated from the dosimeter. Then the power supplied to the lamp is cut or decreased, so that the dosimeter is heated by the afterglow of the lamp. Therefore the rate of temperature rise of the dosimeter becomes quite slow in the latter half of heating process, whereby the temperature of dosimeter easily falls into the required range.

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Kadoma, Japan

Masafumi Watari