SU1644063A1

SU1644063A1 - Focusing lens

Info

Publication number: SU1644063A1
Application number: SU884625324A
Authority: SU
Inventors: Михаил Валентинович Пятахин; Альберт Федорович Сучков
Original assignee: Физический институт им.П.Н.Лебедева
Priority date: 1988-12-26
Filing date: 1988-12-26
Publication date: 1991-04-23

Abstract

Изобретение относитс к оптике и может быть использовано в мощных лазерных установках дл светосильной концентрации излучени на различные объекты, а также дл создани оптических ретрансл торов, пространственных фильтров и т. д Цель , ч изобретени - упрощение конструкции при сокращении эффективности концентрации мощного лазерного излучени . Фокусирующа линза выполнена в виде светопреломл ющего тела 1, ограниченного двум осесимметричными поверхност ми, одна из которых - 2 имеет ступенчатый неасферический рельеф, а друга - 3 выполнена неасферической . Приведен закон, а соответствии с которым выполнен ступенчатый рельеф, обеспечивающий высокую эффективность концентрации мощного лазерного излучени при относительно простой конструкции линзы . Возможно выполнение линзы с поверхно- ст ми ступенчато-сферической и сферической, ступенчато-сферической и плоской , а также ступенчато-плоской и сферической . 3 з.п. ф-лы, 5 ил. СОThe invention relates to optics and can be used in high-power laser systems for brightly concentrating radiation to various objects, as well as for creating optical repeaters, spatial filters, etc. The purpose of the invention is to simplify the design while reducing the concentration efficiency of high-power laser radiation. The focusing lens is made in the form of a light refracting body 1, bounded by two axisymmetric surfaces, one of which, 2, has a stepped non-spherical relief, and the other, 3, is made non-spherical. A law is given, and according to which a step-like relief is made, which ensures a high efficiency of the concentration of high-power laser radiation with a relatively simple lens design. It is possible to make lenses with stepped spherical and spherical surfaces, stepped spherical and flat surfaces, as well as stepped flat and spherical surfaces. 3 hp f-ly, 5 ill. WITH

Description

- JOO -80 -SO -W -20- JOO -80 -SO -W -20

Фиг. 5FIG. five

20 40 г. нкм20 40 nkm

Claims

Claim

1. A focusing lens bounded by two axisymmetric surfaces, one of which has a stepped relief, and the second is non-aspherical, characterized in that. in order to simplify the design while maintaining the effectiveness of the concentration of high-power laser radiation. stepped relief is made non-aspherical in accordance with the law

Λ f _int [ ^ψ (οΟ)) - ^ ^ίηΐ [ ^φ (Ρ (Ρπ)) ^{/ Λ} ] m 1 ^{1 2 3 4} λ / t

1121 where h is the height of the steps, counted to the side opposite to the surface of the lens without relief;

η is the refractive index of the lens material;

λ is the wavelength of the focused radiation;

m> 1 is a positive integer;

Int is the integer part;

Ф (/ Х / Эп)) ~ function of spherical aberrations for a lens with zero step height in a plane perpendicular to the optical axis and tangent to the output surface of the lens;

P (D1) is the distance to the optical axis in this plane;

/ EP is the distance corresponding to p (pn) to the optical axis on the surface with a stepped relief.

2. Lens pop. 1. characterized in that one of the surfaces of the lens is made stepwise spherical, and the other spherical.

3. Lens pop. 1. characterized in that one of the surfaces of the lens is made stepwise spherical, and the other is flat.

4. Lens pop. 1, characterized in that one of the surfaces of the lens is made stepwise flat, and the other is spherical.

Fig. C