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LPC
Laser Power Controller激光功率控制器
激光功率控制器(LPC)提供全自动的激光束功率调节和控制功能。它几乎可以使用在任何的连续波或模锁定激光上，也可选购使用在脉冲激光上。激光功率控制器可透过RS-232或GPIB接口进行数字化控制，也可透过模拟式输入插孔进行控制。面板上的微处理器使用四位数字呈现实际的输出光束功率。
GENERAL 概述
l Operates with collimated, polarized laser sources, either with CW or mode-locked (pulsed lasers optional)
l Consists of an optics module and rack-mountable electronics module, connected by a 3.5-meter cable
l May be controlled from the front panel, or via an RS-232 computer interface using ascii commands (GPIB interface optional)
l 可搭配多种准直、偏振激光光源使用，包括连续波或模锁定激光（可选购使用在脉冲激光上）
l 由一个光学模块及可机架安装之电子控制模块所组成，两者之间由一3.5米长之电缆连接
l 可从前方面板进行控制，或透过RS-232计算机接口使用美国国家信息交换代码下达指令（可选购GPIB接口）
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l Wavelength ranges from 425 to 1700nm |
l 波长范围从425至1700nm |
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l Adjustment of laser beam power over 40:1 range |
l 激光束功率可调整范围超过40比1 |
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l Laser beam power stabilized to 0.03% |
l 可稳定激光束功率至0.03% |
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l Transmittance of 85% |
l 穿透率可达85% |
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l Reduction of laser noise from DC to 5 kHz |
l 可将激光噪声从DC减少至5 kHz |
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LPC’s precise control of laser power provide valuable applications in numerous applications. |
激光功率控制器可精确地控制激光功率，这对许多的应用都具有相当高的价值。 |
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l Achieve precise exposure control and densitometry |
l 达成精确的曝光控制和光密度量测 |
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l Improve transmission and scattering measurements |
l 增进穿透率和散射的量测 |
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l Remove baseline drift and 1/f noise from the spectra |
l 从光谱中移除基准线漂移和1/f噪声 |
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l Regulate beam power when scanning Ti: Sapphire laser |
l 当扫描钛：蓝宝石激光时，可调整光束功率 |
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l CCD/Display characterizations |
l CCD／显示器特性鉴定 |
Figure 1. Control of 5mW He-Ne laser.
图一、对五毫瓦氦－氖激光之调控。
LPC is a patented intensity control system that fits and connects externally to most of the laser beam, including He-Ne, Ar++, Kr++, He-Cd, Nd: YAG, Ti:Sapphire, and others. It also employs a high-speed liquid crystal part as well as a thermally-controlled monitor photodiode to regulate the beam intensity at a user- select ed level (see Fig.2). LPC will operate by modulating the laser beam, without connecting itself to the laser system.
激光功率控制器是一套具有专利的强度控制系统，以外接的方式适用于大多数的激光束中，包括氦－氖、氩、氪、氦－镉、钕：钇铝石榴石、钛：蓝宝石激光等。这套控制器使用一个高速液晶组件及温度控制监测光二极管，按操作者选定的等级去调整激光束的强度。控制器的运作是调制激光束，而不需连接至激光系统。
Among LPC’s features are its compact size and large aperture, making it easier to align. Its liquid crystal modulator allows it to be used with IR lasers, and offers high power handling. A modulation input permits analog select ion of desired output power, while a reference output provides a signal proportional to the monitor photodiode reading.
激光功率控制器的特点尚有它的紧致尺寸及大孔径，使得它非常容易进行调准直。它的液晶调制器可使用在红外线激光上，并提供高功率激光的操纵功能。一个调制输入使操作者可对所需的输出功率进行模拟选择，而参考输出可提供正比于监测光二极管读值的讯号。
Figure 2. LPC System Operational Schema. Photodiode output is compared with the user- select ed level, be it digitally set; its amplified difference signal will adjust the modulator to maintain the desired output of the beam power.
图二、激光功率控制器系统操作图解。光二极管的输出与操作者以数字设定的功率等级进行比较；差别讯号经放大后可调整调制器，以维持所需之输出光束功率。