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LPC
Laser Power Controller激光功率控制器
激光功率控制器(LPC)提供全自動的激光束功率調節(jié)和控制功能。它幾乎可以使用在任何的連續(xù)波或模鎖定激光上，也可選購使用在脈沖激光上。激光功率控制器可透過RS-232或GPIB接口進行數(shù)字化控制，也可透過模擬式輸入插孔進行控制。面板上的微處理器使用四位數(shù)字呈現(xiàn)實際的輸出光束功率。
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 可搭配多種準直、偏振激光光源使用，包括連續(xù)波或模鎖定激光（可選購使用在脈沖激光上）
l 由一個光學模塊及可機架安裝之電子控制模塊所組成，兩者之間由一3.5米長之電纜連接
l 可從前方面板進行控制，或透過RS-232計算機接口使用美國國家信息交換代碼下達指令（可選購GPIB接口）
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l Wavelength ranges from 425 to 1700nm |
l 波長范圍從425至1700nm |
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l Adjustment of laser beam power over 40:1 range |
l 激光束功率可調整范圍超過40比1 |
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l Laser beam power stabilized to 0.03% |
l 可穩(wěn)定激光束功率至0.03% |
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l Transmittance of 85% |
l 穿透率可達85% |
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l Reduction of laser noise from DC to 5 kHz |
l 可將激光噪聲從DC減少至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確地控制激光功率，這對許多的應用都具有相當高的價值。 |
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l Achieve precise exposure control and densitometry |
l 達成精確的曝光控制和光密度量測 |
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l Improve transmission and scattering measurements |
l 增進穿透率和散射的量測 |
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l Remove baseline drift and 1/f noise from the spectra |
l 從光譜中移除基準線漂移和1/f噪聲 |
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l Regulate beam power when scanning Ti: Sapphire laser |
l 當掃描鈦：藍寶石激光時，可調整光束功率 |
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l CCD/Display characterizations |
l CCD／顯示器特性鑒定 |
Figure 1. Control of 5mW He-Ne laser.
圖一、對五毫瓦氦－氖激光之調控。
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專利的強度控制系統(tǒng)，以外接的方式適用于大多數(shù)的激光束中，包括氦－氖、氬、氪、氦－鎘、釹：釔鋁石榴石、鈦：藍寶石激光等。這套控制器使用一個高速液晶組件及溫度控制監(jiān)測光二極管，按操作者選定的等級去調整激光束的強度?？刂破鞯倪\作是調制激光束，而不需連接至激光系統(tǒng)。
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點尚有它的緊致尺寸及大孔徑，使得它非常容易進行調準直。它的液晶調制器可使用在紅外線激光上，并提供高功率激光的操縱功能。一個調制輸入使操作者可對所需的輸出功率進行模擬選擇，而參考輸出可提供正比于監(jiān)測光二極管讀值的訊號。
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.
圖二、激光功率控制器系統(tǒng)操作圖解。光二極管的輸出與操作者以數(shù)字設定的功率等級進行比較；差別訊號經(jīng)放大后可調整調制器，以維持所需之輸出光束功率。