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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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Published on: December 18, 2015

A sensitive and high dynamic range cw laser power meter.

S Krishnan¹, K S Bindra, S M Oak

¹Laser Physics Applications Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India. skrish@rrcat.gov.in

The Review of Scientific Instruments

|January 7, 2009

Summary

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We developed a cost-effective, highly sensitive laser power meter using a photodiode. This device accurately measures laser power from 1 pW to a wide dynamic range, ideal for various applications.

Area of Science:

Optoelectronics and Instrumentation
Laser Technology and Measurement

Background:

Accurate measurement of continuous wave (cw) laser power is crucial for scientific research and industrial applications.
Existing laser power meters often face limitations in sensitivity, dynamic range, or cost-effectiveness.

Purpose of the Study:

To design and develop a cost-effective, highly sensitive continuous wave (cw) laser power meter.
To achieve a large dynamic range for versatile laser power measurements.

Main Methods:

The power meter is based on a photodiode sensor integrated with a current-to-voltage converter, offset balancing circuit, microcontroller, and analog-to-digital converter.
Key components include reed relays and an alphanumeric liquid crystal display for readout.
An analog background balancing circuit and autoranging capabilities were implemented to enhance performance.

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Main Results:

The developed laser power meter demonstrates high sensitivity, capable of recording absolute laser power levels as low as 1 picowatt (pW).
A large dynamic range of 8x10^10 was measured using a continuous wave (cw) laser at a 532 nm wavelength.
The combination of analog background balancing and autoranging contributes to the meter's high sensitivity and broad dynamic range.

Conclusions:

The designed photodiode-based laser power meter offers a cost-effective solution with exceptional sensitivity and a wide dynamic range.
This instrument is suitable for precise measurement of continuous wave (cw) laser power across various levels, from picowatts upwards.
The implemented analog background balancing and autoranging techniques are effective in achieving superior performance metrics for laser power measurement devices.