Measurement and characterization of the frequency noise of a laser-diode-pumped single-frequency Tm-Ho:YAG laser |
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| Authors: | Laporta P. Bava E. Svelto C. Sapia A. Cosentino A. |
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| Affiliation: | (1) INFM, Dipartimento di Fisica del Politecnico di Milano and CNR-CEQSE, Piazza Leonardo da Vinci 32, 20133 Milano, Italy;(2) INFM, Dipartimento di Elettronica e Informazione del Politecnico di Milano and CNR-CSTS, Piazza Leonardo da Vinci 32, 20133 Milano, pItaly;(3) Fondazione Ugo Bordoni – ISCTI, Via Baldassarre Castiglione 59, 00142 Roma, Italy;(4) Alenia Difesa, Via dei Castelli Romani 4, 00140 Pomezia, Italy |
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| Abstract: | The frequency noise characteristics of a single-frequency 2.1- m Tm-Ho:YAG laser have been thoroughly investigated. From the measurement of the frequency noise spectral density, performed by means of an interferometric technique, a short-term laser linewidth of 550 kHz over 1-ms time interval has been obtained. The frequency stability, defined as the two sample standard deviation of the frequency fluctuations with dead time T, has been also evaluated, obtaining values ranging from  250 kHz to 2.5 MHz for T values between 1 and 100 ms over an observation time of 100 ns. It has been shown through a numerical analysis that a significant improvement is achievable, attaining a frequency stability of 25 kHz for T up to 100 ms, by using the Pound–Drever locking technique in connection with a roto-vibrational line of the HBr molecule. |
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| Keywords: | coherent laser radar frequency noise frequency stabilization lidar Tm-Ho:YAG laser |
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