A comparison between the use of the fringe-side and the frequency-modulation methods to frequency stabilize diode-pumped Tm-Ho:YAG lasers against linear absorption lines of CO<sub>2</sub> near 2.1μm is reported. Frequency stability was evaluated by monitoring of the beat signal between two independently stabilized Tm-Ho:YAG systems. Frequency instability levels of ~20 and ~400 kHz for 1-s integration time were achieved by the frequency-modulation and fringe-side methods, respectively.
© 2003 Optical Society of America
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3580) Lasers and laser optics : Lasers, solid-state
(280.1910) Remote sensing and sensors : DIAL, differential absorption lidar
(300.6380) Spectroscopy : Spectroscopy, modulation
Gianluca Galzerano, Marcello Marano, Stefano Taccheo, and Paolo Laporta, "2.1 - μm lasers frequency stabilized against CO2 lines: comparison between fringe-side and frequency-modulation locking methods," Opt. Lett. 28, 248-250 (2003)