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DDC: 620 × Subject: Pumping (laser) ×

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    Optimization of the energy deposition in glasses with temporally-shaped femtosecond laser pulses
    (Amsterdam [u.a.] : Elsevier, 2011) Mauclair, C.; Mishchik, K.; Mermillod-Blondin, A.; Rosenfeld, A.; Hertel, I.V.; Audouard, E.; Stoian, R.
    Bulk machining of glasses with femtosecond laser pulses enables the fabrication of embedded optical functions. Due to the nonlinear character of the laser-matter interaction, structural modifications can occur within the focal region. To reach a full control of the process, ways of controlling the deposition of the laser energy inside the material have to be unveiled. From static and time-resolved pictures of bulk-excitation of a-SiO2 and borosilicate glass, we show that particular laser temporal shapes such as picosecond sequences can better confine the energy deposition than the femtosecond sequence by reducing the propagation artifacts.
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    Tm3+-doped calcium lithium tantalum gallium garnet (Tm:CLTGG): novel laser crystal
    (Washington, DC : OSA, 2021) Alles, Adrian; Pan, Zhongben; Loiko, Pavel; Serres, Josep Maria; Slimi, Sami; Yingming, Shawuti; Tang, Kaiyang; Wang, Yicheng; Zhao, Yongguang; Dunina, Elena; Kornienko, Alexey; Camy, Patrice; Chen, Weidong; Wang, Li; Griebner, Uwe; Petrov, Valentin; Solé, Rosa Maria; Aguiló, Magdalena; Díaz, Francesc; Mateos, Xavier
    We report on the development of a novel laser crystal with broadband emission properties at ∼2 µm – a Tm3+,Li+-codoped calcium tantalum gallium garnet (Tm:CLTGG). The crystal is grown by the Czochralski method. Its structure (cubic, sp. gr. 𝐼𝑎3¯𝑑, a = 12.5158(0) Å) is refined by the Rietveld method. Tm:CLTGG exhibits a relatively high thermal conductivity of 4.33 Wm-1K-1. Raman spectroscopy confirms a weak concentration of vacancies due to the charge compensation provided by Li+ codoping. The transition probabilities of Tm3+ ions are determined using the modified Judd-Ofelt theory yielding the intensity parameters Ω2 = 5.185, Ω4 = 0.650, Ω6 = 1.068 [10−20 cm2] and α = 0.171 [10−4 cm]. The crystal-field splitting of the Tm3+ multiplets is revealed at 10 K. The first diode-pumped Tm:CLTGG laser generates 1.08 W at ∼2 µm with a slope efficiency of 23.8%. The Tm3+ ions in CLTGG exhibit significant inhomogeneous spectral broadening due to the structure disorder (a random distribution of Ta5+ and Ga3+ cations over octahedral and tetrahedral lattice sites) leading to smooth and broad gain profiles (bandwidth: 130 nm) extending well above 2 µm and rendering Tm:CLTGG suitable for femtosecond pulse generation.