Simple laser pulse energy monitor

We report a sensitive and high dynamic range photodiode-based laser energy meter. The essential blocks of the energy meter are the photodetector circuit, the signal conditioning circuit and the capacitor discharge circuit. The output signal of the energy meter is read on an oscilloscope. The effective dynamic range of the energy meter measured at a laser wavelength of 532 nm is 6 × 106 and the minimum detectable energy is about 2 pJ. The large dynamic range is obtained by incorporating different energy sensing capacitors and the amplification of the input signal. The minimum detectable energy and the effective dynamic range of the energy meter are better than that of the energy meters reported in the literature.

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“…Various energy meters are reported in [1][2][3][4][5][6][7][8][9][10]. Most of these reports are quite old.…”

Section: Introductionmentioning

confidence: 99%

A sensitive and high dynamic range laser energy meter

Krishnan

Bindra

2011

Meas. Sci. Technol.

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“…Smirl et al [5] presented an energy monitor for simple laser pulses including an integrating detector circuit, an amplifier and a peak detector and hold circuit. Kuroda [6] demonstrated a peak and hold circuit which consists of two basic units: peak and hold, and sample and hold circuits.…”

Section: Introductionmentioning

confidence: 99%

Compact Energy Measuring System for Short Pulse Lasers

Barna

Földeş

Gingl

et al. 2013

Metrology and Measurement Systems

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In experiments with short-pulse lasers the measurement control of the energy of the laser pulse is of crucial importance. Generally it is difficult to measure the amplitude of the pulses of short-pulse lasers using electronic devices, their response time being longer than the duration of the laser pulses. The electric response of the detector is still too fast to be directly digitized therefore a peak-hold unit can be used to allow data processing for the computer. In this paper we present a device which measures the energy of UV short (fs) pulses shot-byshot, digitizes and sends the data to the PC across an USB interface. The circuit is based on an analog peak detect and hold unit and the use of fiber optical coupling between the PC and the device provides a significant improvement to eliminate potential ground loops and to reduce conductive and radiated noise as well. The full development is open source and has been made available to download from our web page (http://www.noise.inf.u-szeged.hu/Instruments/PeakHold/).

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