CS270306B1 - Method of stabilizing the laser dye shutter - Google Patents

Abstract

The solution relates to the field of production of the basis of laser construction and solves the problem of long-term stability of the dye shutter. The essence of the solution lies in the fact that a given amount of carbonate or alkali hydroxide is placed in a closed reactor, in which there is a dye shutter. This carbonate or hydroxide binds to itself gases of an acidic nature, which are released from the used structural organic materials containing halogen or kyelfk. The method obtains keyed lasers with a high storage and functional life without special requirements for insulating, structural and coating organic materials.

Description

The object of the invention is to stabilize the dye closure of the laser on the basis of protection against the harmful action of decomposition products of organic substances containing halogen or oxygen.

Due to their principled Simplicity, solid-state lasers switched with a dye closure represent a widely used source of short pulses of coherent light radiation, they are widely used not only in laser rangefinders, but also in many other applications requiring light pulses of units up to tens of ns. In the case of a laser equipped with said shutter, it represents a functional mass-produced device and not a laboratory set-up. All optical dQy of the laser generator is protected from dust, moisture and other adverse environmental influences by placing it in an enclosed space. In practice, organic substances containing hall elements or oxygen are also placed in such an enclosed space, such as cable insulation, sealants or materials used for surface treatment. These substances release small amounts of flue gases at higher temperatures, either spontaneously, which is typical of halogen-containing organic polymers, or by the action of traces of free halogens or photolytically formed peroxide-bonded substances, which is observable in oxygen-containing organic materials. Primary substances for starting the last, i.e. photolytically induced decomposition They are either plasticizers contained in plastics or steps of oxygen and water. In any case, the gaseous products of spontaneous or photolytically induced decomposition decompose the closure dye very effectively, even when dissolved in a polymer such as acetylcellulose, thereby changing the functional parameters of the entire laser.

The method of stabilizing the laser dye closure according to the invention eliminates these drawbacks by placing carbonate and alkali hydroxide in an enclosed space at the same time. The contact area of the enclosed space of which is at least 0.5% of the square root of the volume of this space.

Gaseous products which have an acidic reaction are absorbed by carbonate or alkali hydroxide, which is converted into bicarbonate and alkali halide. The method according to the invention makes it possible to construct keyed lasers with a high storage and functional service life without special demands on insulating, structural and coating organic materials.

Example 1 t

The dye cap was tested in the form of an optically high-quality 2 cm cellulose triacetate vial stained with bis (4-dimethylaminodiothlobenzyl) nlk1 dye at a concentration such that the optical transmittance at 1 w64 nm was 32%. This fdlte was placed in a solid-state laser optical resonator with a 5 mm diameter NdiYAG laser bar. The laser resonator consisted of two 99.8% and 27.5% reflecting mirrors 30 cm apart. The laser then, with a suitable pumping, generated pulses with a half-width of 12 na and an energy of 29 mJ. The plate was then cut into two parts and each part was placed in an ampoule 2 cm in diameter and 16 cm high. The first ampoule contained 1.8 g of Teflon. The second ampoule contained about 1 g of potassium hydroxide, which was separated from the rest of the space by a layer of fine glass shards, and 2.1 g of Teflon. The ampoules were stored for 72 days at 90 ° C. After this time, the concentration of the dd in the first ampoule decreased the dye concentration to such an extent that the optical transmittance at a wavelength of 1064 nm was 50%. If this part of the film was used as a passive modulator of the described laser, pulses with a maximum energy of 13 mJ were achieved. In contrast, no demonstrable changes were found in both the optical transmittance and the laser generation parameters of the fdlle in the second ampoule.

Example 2: '

A dye cap in the form of an optically high-quality cellulose triacetate film partially softened with o-nitrophenyl-n-octyl ether plasticizer, stained with bis (4-diethylaminodithiobenzyl) dye, was tested at a concentration such that the optical transmittance at 1064 nm was 40%. As a passive modulator of the quality of resonators of a solid-state laser with a NdtYAG crystal with a diameter of 4 mm, whose optical resonator was formed by mirrors with a reflectivity of 30%

CS 2? O3o6 B1 and 99.9% vaporized on a common substrate and a corner reflector. The total length of the resonator was 5o cm. This laser generated a pulse with a half-width of 16 ns and an energy of lo mJ with suitable pumping. Then Mile was cut into two parts and each part was placed in an ampoule 2 cm in diameter and 16 cm high. The first ampoule contained 2.2 g of PVC insulating tubes. The second ampoule contained about 1 g of potassium carbonate, separated from the rest of the space by a layer of fine glass shards and 2.5 g of PVC insulating tubes. The ampoules were filled with nitrogen and sealed. The ampoules were stored for 72 days at 90 ° C. After this time, the dye concentration of the phial in the first ampoule decreased to such an extent that the optical transmittance at a wavelength of 1064 nm was 54%. When this fdile was used as a passive modulator of the quality of the resonator of the described laser, a pulse with an energy of 6 IU was obtained. In contrast, no demonstrable changes were found in the fdile stored in the second ampoule.

Claims (1)

OBJECT OF THE INVENTION Method for stabilizing a laser dye barrier based on protection against the harmful effects of acidic gases released from organic materials containing halogen or oxygen placed in the same space as this seal, characterized in that an alkali carbonate or hydroxide is placed in this space, the contact surface of which and closed space is at least 0.5% of the square root of the volume of this space and which binds these gases to each other, thus preventing them from acting on the dye seal.