We obtain an analytical expression for the pulse repetition period jitter of a diode-pumped solidstate laser with passive Q-switching of the resonator. The possibilities of reducing the jitter of the pulse repetition period of generation are studied.

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We study the pulse interval jitter of a passively and actively acousto-optically Q-switched solidstate laser. Diffraction and birefringent acousto-optical cells are considered as active Q-switches. Analytical expressions for the pulse interval jitter of a solid-state laser are obtained. The possibilities of jitter reduction are examined.

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By doping the core of a triplex quartz optical fibre with P 0 GeO and B 0 it is possible to reduce its 9 6 1 2 5" 2" 2 3' temperature sensitivity (TS) from 7. .10 -6 K -1. The same decrease in TS can be obtained by doping the third layer with TiO 2. The doping level in both cases shouM be 30-40 mole %. The TS of an optical fibre greater than 80 I.tm in diameter is almost not a function of random changes in the diameter. For a liquidcrystalline polymer cladding above a fixed value, the TS of the fibre is weakly dependent on the change in the thickness.Increasing the quality and efficiency of use of chemical fibres and thread is to some degree dependent on the methods of process control in their manufacture and use. Multilayer optical fibres which are compatible in technology and design with the fibres investigated are used as control sensors in many cases.As a function of the problem to be solved, the parameters of a multilayer optical fibre should be specially optimized. The temperature sensitivity of the fibre, determined by coefficient K, is of primordial interest. In particular, the structure (material and geometry of the layers) of the fibre should be selected so that small variations in the structure arising during its manufacture would not cause large changes in K t.The optical fibre in design is a q-layer (q = 2, 3, 4 .... ; the first layer corresponds to the core, the second to the cladding, the third to the technical cladding, etc.) structure, whose layers have different thermal, elastic, and optical properties [ 1, 2]. The temperature sensitivity of such a fibre is a function of a multitude of parameters, which causes great difficulties in determining the structure of special fibres with assigned technical characteristics.The effect of doping the core, third layer, and the liquid-crystalline polymer cladding on the temperature sensitivity of triplex quartz optical fibres with different geometry and structure is examined here.The change in K t can be caused by both a change in the parameters of the fibre material --Young's modulus (Era), Poisson's ratio (Vm), coefficient of thermal expansion (CTE --Xm), and a change in the geometry of the layers --area of the cross section (S), radius (rm) of the layers of the fibre (m = 1, 2, 3 ..... q corresponds to the layer number). Relatively slight doping of molten quartz with P205 , GeO2, B203, and TiO 2 significantly changes primarily its CTE, and with a concentration of oxide of less than 30%, the CTE of molten quartz increases linearly with an increase in the concentration of P205, GeO2, and B203 and decreases linearly with an increase in the concentration of TiO 2. The CTE (X) of molten quartz as a function of the concentration of oxide (Y, mole %) can be written as follows:where K= 0.13 (mole %)-1 for P205 , 0.07 (mole %)-1 for GeO 2 and B203, and ~.1 (mole %)-1 for TiO 2.For a low concentration of oxide, the temperature sensitivity of a quartz optical fibre as a function of doping is thus reduced to the dependence ofK t on CTE.We will first investigate the t...