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Investigation of a passively Q-switched Raman laser at 1176?nm with Nd3+:YAG/Cr4+:YAG/YAG composite crystal and a coupled cavity
摘要： To reduce the thermal lens effect and increase the efficiency, a composite crystal of Nd3+:YAG/Cr4+:YAG/YAG and a coupled cavity structure were employed in our passively Q-switched YVO4-based Raman laser system. Both the simulation and the experiment results showed that the undoped YAG crystal bonded in the end-face of Cr4+:YAG crystal can speed up the heat transfer of Cr4+:YAG crystal and reduce the temperature difference between its side surfaces and the center significantly, and the coupled cavity structure can improve the laser performance, especially at high pump power. The maximum output power of Raman laser of 0.92 W at 1176 nm was obtained with an optical-to-optical efficiency of 11.51%. The corresponding repetition rate and the pulse width is 53.5 kHz and 3.22 ns, respectively.
关键词： Composite crystal,Passively Q-switched,Temperature field,Coupled cavity,Raman,Finite element method
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Low-Jitter, Narrow-Bandwidth, Single Longitudinal Mode Passively Q-Switched Nd:YAG Ring Laser Oscillator with External Feedback
摘要： Fourier-limited, also called single-frequency or single-longitudinal-mode (SLM) nanoseconds lasers at 1 μm are key elements for several applications, such as optical communications, data storage and high-resolution spectroscopy. Some special application such as high spectral resolution LIDAR [1], require very high spectral purity (tens of MHz bandwidth), resulting in long pulse durations in the range of several tens of ns. Microchip lasers with large free spectral range (FSR) comparable to the active medium gain bandwidth (about 160 GHz for Nd:YAG) allow easy SLM selection, but with much shorter pulses. Recently, we demonstrated a Cr:YAG Passively Q-Switched (PQS) Nd:YVO4 ring laser oscillator delivering 50-ns, 80-μJ SLM pulses at 0.1-10 kHz repetition rate employing a specifically designed intracavity etalon to enhance SLM operation [2]. For SLM PQS operations, Nd:YAG offers some advantages if compared to Nd:YVO4. Namely, the higher saturation fluence relaxes the fulfilment of the second PQS threshold condition, the ~2 times longer fluorescence lifetime enhances energy storage and the narrower gain bandwidth favours SLM operation.
关键词： Nd:YAG,single-longitudinal-mode,passively Q-switched,external feedback,ring laser
更新于2025-09-12 10:27:22
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High-repetition-rate passively Q-switched Nd:GdTaO4 1066?nm laser under 879?nm pumping
摘要： We report an 879 nm laser diode directly pumped passively Q-switched Nd:GdTaO4 laser at 1066 nm. The continuous-wave output power at 1066 nm reaches 5.6 W under an incident pump power of 12.8 W, corresponding to an optical-to-optical efficiency of 43.8% and a slope efficiency of 48.0%. By using Cr4+:YAG as the saturable absorber, passively Q-switched laser operation is conducted, yielding a highest pulse repetition frequency of 185 kHz and a maximum average power of 3.6 W. The shortest pulse width of 15.2 ns is achieved with a peak power of 2.34 kW at 33.7 kHz. The beam quality factors at the maximum average output power is Mx2 = 1.5, My2 = 2.2 by using knife-edge method. The thermal focal length and internal loss for Nd:GdTaO4 crystal is also investigated.
关键词： LD pumped,Passively Q-switched,Nd:GdTaO4
更新于2025-09-12 10:27:22
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Passively Q-switched laser using PtSe2 as saturable absorber at 1.3 μm
摘要： We report a passively Q-switched Nd:YVO4 laser at 1341.5 nm by using few-layer Platinum diselenide (PtSe2) as the saturable absorber (SA). The nonlinear saturable absorption properties of the PtSe2 at 1.3 μm were measured, showing a modulation depth of 7% and a saturation intensity of 25 GW/cm2, respectively. The maximum Q-switched pulse average power was 209 mW under the absorbed pump power of 3.62 W. The shortest pulse duration and the highest pulse repetition rate was 775 ns and 103.5 kHz, respectively. The instability (output powers, rms) of the Q-switched pulse was measured to be about 0.63% for one hour. The results indicated that the PtSe2 have a good performance as a potential SA in the 1.3 μm spectral range.
关键词： PtSe2,passively Q-switched,diode-pumped laser,1.3 μm
更新于2025-09-11 14:15:04