In this paper, we have reviewed laser technology and its applications in different areas. Overview of different kinds of lasers used for number of applications in real world have been presented. Moreover, this review paper covers technology advancement from the last decades along with providing a detailed transition from simple lasers to nano-sized lasers, also known as spasers, which are based on plasmonic nanoparticles. The main focus of this review study is to provide deep insights of nanolasers, structures, materials, techniques and provides a bright path for future researchers to study the contribution of different workgroups with the ease of using this single platform. We have also provided the details of different materials used and analyzed by different researchers and upto what extent they were stood successful in designing efficient spaser design that led toward optimal features.

在本文中，我们回顾了激光技术及其在不同领域中的应用。已经提出了在现实世界中用于多种应用的不同种类的激光器的概述。此外，这篇综述文章涵盖了近几十年来的技术进步，并提供了从等离子纳米粒子从简单激光器到纳米级激光器（也称为spaser）的详细过渡。这篇综述研究的主要重点是提供对纳米激光，结构，材料，技术的深刻见解，并为未来的研究人员轻松使用该单一平台研究不同工作组的贡献提供一条光明的道路。