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Measurement of frequency modulation amplitude of lasers to 1 part in 103

P Balling

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We describe a simple method for measuring the amplitude of a laser's frequency modulation by counting the beat-frequency signal against an unmodulated reference laser. This method is useful in the case of the third-harmonic detection technique with 633 nm He-Ne/I2 lasers. The estimated uncertainty of less than 1 part in 103 is much better (by at least a factor of 50) than that obtained using a radio-frequency (rf) spectral analyser.


PACS

42.60.Fc Modulation, tuning, and mode locking

42.55.Lt Gas lasers including excimer and metal-vapor lasers

06.20.Dk Measurement and error theory

Subjects

Instrumentation and measurement

Optics, quantum optics and lasers

Dates

Issue 4 (August 2001)



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