LD pumped Yb:LuAG mode-locked laser with 763ps duration

State State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, PO BOX 800-211,Shanghai 201800, China.
Optics Express (Impact Factor: 3.49). 07/2009; 17(14). DOI: 10.1364/OE.17.011537


Diode-pumped Yb:LuAG laser has been passively mode locked with a SESAM for the first time to the authors' knowledge. The pulses as short as 7.63ps were generated, without negative dispersion elements. The output power achieved 610mW at pump of 11.2W with repetition rate of 86MHz. The continuous-wave operation and wavelength tuning pumped at 940nm were also examined, and its tuning can cover the range of 1033nm-1079nm.

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Available from: Jinping He, Feb 27, 2015
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    • "The first laser demonstration of Yb:LuAG single crystal was reported in 1976 [32]. Recently, a Yb:LuAG single crystal disk laser oscillation with a 5 kW output power and a mode-locked laser oscillation with 7.63 ps pulse duration [33] were reported. Moreover the transparent polycrystalline Yb:LuAG ceramics have been successfully developed as a novel laser gain medium [34e41]. "
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    ABSTRACT: We reported on the fabrication and properties of 2.5 at.% Yb:LuAG ceramics prepared by a solid-state reactive sintering method using commercial available powders as starting materials. The Yb:LuAG ceramics sintered at 1850 oC for 50 h have a dense and homogeneous structure with the average grain size of about 60 μm. The transmittances of the Yb:LuAG ceramics with the 3 mm thickness are 82.6% at 400 nm and 84.0% at 1100 nm. The maximum luminescence peak is located at about 1029 nm and the fluorescence lifetime is 1.3 ms. It is demonstrated that the Yb:LuAG ceramics have excellent mechanical properties, furthermore the thermal expansivity and thermal conductivity are even better than those of Yb:YAG ceramics. Continuous-wave (CW) laser operation is obtained with the maximum output power of 2.1 W and a slope efficiency of 41.7% for non-coated Yb:LuAG ceramics with the output coupler of T=10%.
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    • "The Yb-doped garnet crystals generally possess high thermal conductivity, excellent physical and chemical property, and mature fabrication process, which is a good candidate for high-average-power picosecond lasers. Among Yb 3+ -doped garnet crystals, Yb:YAG and Yb:LuAG have been widely investigated in mode-locked lasers [15], [16], [19]. While as their mixed crystal, Yb:Lu 1.5 Y 1.5 Al 5 O 12 (Yb:LuYAG) has never been investigated in mode-locking operation. "
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    ABSTRACT: We report on a diode-pumped passively mode-locked Yb:Lu$_{1.5}$Y$_{1.5}$Al$_5$O$_{12}$ (Yb:LuYAG) laser for the first time to our knowledge. With the mixed crystal of Yb:LuYAG as gain medium, the mode-locked laser generated 2.2 W of average output power with a repetition rate of 83.9 MHz and pulse duration of 2.2 ps at the wavelength of 1030 nm. In order to obtain higher output power, the output from the mode-locked oscillator was further amplified to 8.5 W by two-stage single-pass amplifiers. The high-power picosecond laser is very useful for applications such as pumping of mid-infrared optical parametric oscillators, material micro-processing, and UV light generation, etc.
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    • "Efficient passively Q-switched Yb:LuAG microchip lasers have been demonstrated[6]. Continuous-wave tunable laser operating from 1033 – 1079 nm and passively mode-locked laser operation with pulse width of 7.63 ps have been reported in laser-diode pump Yb:LuAG lasers[7]. However, even with optimum output coupling of 15% transmission, slope efficiency of only 42.7% was achieved with respect to the absorbed pump power for continuouswave operation. "
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    ABSTRACT: Efficient continuous-wave laser operation based on Yb:LuAG crystals has been obtained at 1030 and 1047 nm. Stable, subnanosceond passively Q-switched Yb:LuAG/Cr4+:YAG microchip lasers were demonstrated with slope efficiencies of 40%.
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