2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application

Abstract : We report on the development and the demonstration of a two-wavelength single-frequency laser oscillator based on Ho:YLF crystal. This laser is especially suitable for application as a transmitter in differential absorption lidar (DIAL)/integrated path differential absorption (IPDA) measurements of atmospheric carbon dioxide (CO2) using the R30 CO2 absorption line at 2,050.967 nm. The oscillator consists in a fiber-coupled and free-space solid-state hybrid system and can be used in high-energy middle-rate or moderate-energy high-rate configurations. The latter produced On and Off sequentially single-frequency laser pulses with 13 mJ of energy at a repetition rate of 2 kHz and pulse duration of 42 ns. The pulse energy and frequency stabilities are specially documented in free-running, single-frequency and two-frequency seeding single-mode operations. Standard deviation is 7.7 % for pulse energy and 2 MHz for frequency stability for the two-wavelength seeding operation. Allan variance plot shows that frequency fluctuations are reduced below 70 kHz for 10 s of averaging which is suitable for accurate CO2 DIAL or IPDA measurements. © 2014 The Author(s).
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Submitted on : Tuesday, October 28, 2014 - 4:54:44 PM
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F. Gibert, D. Edouart, C. Cénac, F. Le Mounier. 2-µm high-power multiple-frequency single-mode Q-switched Ho:YLF laser for DIAL application. Applied Physics B - Laser and Optics, Springer Verlag, 2014, 116 (4), pp.967-976. ⟨10.1007/s00340-014-5784-3⟩. ⟨hal-01074222⟩

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