Design and modeling of a passively Q-switched diode-pumped Thulium laser at 2.3 μm

OPTICS COMMUNICATIONS

卷:500

Article

Kifle, Esrom¹  Loiko, Pavel¹  Guillemot, Lauren¹  Doualan, Jean-Louis¹  Starecki, Florent¹  Braud, Alain¹  Hideur, Ammar²  Camy, Patrice¹ 

[1] Univ Caen, Ctr Rech Sur Ions Mat & Photon CIMAP, UMR CEA CNRS ENSICAEN 6252, 6 Blvd Marechal Juin, F-14050 Caen 4, France

[2] Univ Rouen, Normandie Univ, CORM UMR6614, CNRS,INSA, Ave Univ,BP 12, F-76801 St Etienne Du Rouvray, France

关键词: Diode-pumped laser;    Thulium ions;    Passive Q-switching;    Mid-infrared;    Laser transition;   

DOI  :  10.1016/j.optcom.2021.127219

来源: Elsevier

【 摘 要 】

We report on a diode-pumped Tm:LiYF4 laser operating on the H-3(4) -> H-3(5) transition (at similar to 2.3 mu m) passively Q-switched by a Cr2+:ZnSe saturable absorber. This laser delivers a maximum average output power of 130 mW at 2304.6 nm with a nearly diffraction limited beam, a linear polarization (pi) and no colasing at similar to 1.9 mu m. The corresponding pulse characteristics (duration/energy) are 1.24 mu s/3.6 mu J at a repetition rate of 36 kHz. By power scaling under quasi-CW pumping, even shorter pulse durations of 870 ns and higher pulse energies of 6.1 mu J are achieved. The performance of the laser is simulated using a model of a quasi-four-level gain medium and a slow saturable absorber showing a good agreement with the experiment. The effect of the thermal lens of the saturable absorber on the pulse characteristics is discussed.

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