Intensity Distribution Investigation And Beam Shaping About The Laser Diode Array

Semiconductor lasers, also known as laser diode (LD), is a class of laser which used semiconductor material as its working medium. Semiconductor lasers, with the properties of monochromaticity, high intensity, small in size, fast response, high efficiency as well as can be directly modulated, have been already playing an important part in optical fiber communication, optical sensors, optical information storage, laser printing, integrated optics and other fields.In order to make semiconductor lasers achieve higher power, laser diode array (LDA) has been designed. Laser diode array is widely used, it can be used as laser pump source, carrying out laser welding, and can also be used for ophthalmologic operation, infrared lighting.However, the output beam of the laser diode array (LDA) presents serious oblate elliptical (such as:1μm×10mm), it can not be directly applied, so to improve the quality of the beam is especially important. The technology of improving the quality of the semiconductor laser beam can be divided into two categories. Due to their relative cheapness, small bulk, light weight, long service time, high transferring efficiency and so on, high power laser diode array (LDA) are wide commercial available. Such as they are becoming increasingly attractive as pump sources for high power solid-state lasers.Unfortunately, because of the highly elliptical output beam (such as:1μm×10mm), they cannot readily be focused into small, circular spots, which are suitable for efficient pump sources of solid-state lasers, LDA's applications have been limited. To date, many of the pump schemes which have been employed with diode arrays have either produced a large focused beam, or have employed relatively complex designs.To overcome the shortage, above all, it is especial important to make certain the nature distribution of the laser beam emitting from high power laser diode array (LDA),then, on the basis of it,a high-efficient and relative-simple laser beam shaper should be provided. So this paper include following two points:one is to construct a new theoretical model about intensity distribution of LDA beam and it's validity has been attested by test, Meanwhile the first-hand data of LDA beam character have been attained; the other is to provide a shaping scheme which consist of a collimating module and a compression module,we have practice it from fabricate,fixing to experimentation.We use the light intensity distribution test system, large amounts of data can be recorded and available to the LDA's three-dimensional beam profile distribution (include:two-dimension and one-dimension if necessarily).The data for the next beam shaping to provide a basis for the premise.Our beam-shaping system which consist of two parts. The first part is orthogonal hyperbolic cylinder-cylinder micro-lens, its role is to reduce the fast axis and slow axis divergence angle; second part of the ellipse-plane lens and plane-cylinder lens, whose objective is to beam compressed, it will slow axis of the beam compressed to within lmm.