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# 电子工程代写|光子简介代写Introduction to Photonics代考|EE134 LASER SAFETY OVERVIEW

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## 电子工程代写|光子简介代写Introduction to Photonics代考|LASER SAFETY OVERVIEW

The availability of a large variety of affordable lasers has made the laser a common tool in industry, medicine, research, and education. You will no doubt use lasers or see laser demonstrations if you are enrolled in an optics or photonics course. Whether you are working with lasers in a school laboratory, using lasers on the job, or watching a laser show, you should be aware of how lasers differ from other light sources and how these differences translate into rules for the safe use of lasers.

The safe handling and use of lasers depends on many factors: the wavelength (or color) of the light, the power (or power density, called irradiance), the viewing conditions, and whether the laser is continuously on (called continuous wave, or $\mathrm{cw})$ or pulsed. We will discuss the basic concepts of laser safety in this chapter and, throughout, one important idea prevails: Treat every laser with respect and care.

Many state, federal, and international laser safety standards exist, but the one most often quoted in the United States is the American National Standards Institute’s (ANSI) Z136 series of laser safety standards. ANSI is a nonprofit organization that oversees the development, distribution, and use of all types of standards and also accredits the procedures used by the organizations that develop standards. The parent document on laser safety standards, ANSI Z136.1, provides complete information on laser classifications, hazards, and controls, and is de-signed to be a reference for users of all types of lasers. Other documents in the series are numbered sequentially (Z136.2 through Z136.9) and cover specific uses of lasers in areas such as health care, education, telecommunications, and outdoor light shows. The documents are available from the Laser Institute of America at its website www.laserinstitute.org.

The International Electrotechnical Commission (IEC) has also created a series of laser safety regulations covering all aspects of laser use and laser product labeling. Like the ANSI standards used in the United States, these international regulations are constantly being updated to reflect current research on laser hazards and new types of lasers. ANSI and IEC work together in an effort to harmonize regulations worldwide, a necessity in a global economy.

U.S. manufacturers of lasers and laser systems must comply with regulations of the Center for Devices and Radiological Health (CDRH) of the Food and Drug Administration (FDA). Among the product safety standards is a requirement that each laser must bear a label indicating the laser hazard classification and information on the beam power and wavelength. Since 2007, the CDRH has allowed American laser manufacturers to conform to the IEC regulations, which reduces the burden of having to show compliance with two different sets of rules. The revised classifications use Arabic numerals 1-4 to refer to laser class, and the letters $\mathrm{M}$ and $\mathrm{R}$ for subclasses, as noted below. You may still see older lasers with the previous system that used Roman numerals I-IV and subclasses designated by the letter A.

## 电子工程代写|光子简介代写Introduction to Photonics代考|CHARACTERISTICS OF LASER LIGHT

The video instructor in the introductory paragraph was correct that a laser produces light. (We are including ultraviolet, visible, and infrared radiation in this broad definition of light.) However, laser light has some very unique characteristics that distinguish it from ordinary light sources. After all, you might be burned by touching a 60-watt lightbulb, but a 60-watt laser can slice through several millimeters of wood. The light from most lasers is usually described as:
monochromatic Lasers emit a single wavelength (color) or narrow band of wavelengths.
coherent The light produced by a laser consists of waves that are “in step.”
(Coherence will be further explored in Chapter 6.)
highly directional Most laser beams do not spread much as they propagate.
We say they are “collimated” and, as a result, beam energy is concentrated in a small area.
In Chapter 9 , we will further explore the properties of laser light.

## 电子工程代写|光子简介代写Introduction to Photonics代考|LASER SAFETY OVERVIEW

. LASER SAFETY OVERVIEW

## 电子工程代写|光子简介代写光子学介绍代考|激光的特性

(相干性将在第6章中进一步探讨)高方向性大多数激光束在传播时不会传播很多。我们说它们是“准直的”，因此，束能量集中在一个小区域。在第九章中，我们将进一步探讨激光的性质

## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。