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Energetic picosecond 10.2-µm pulses generated in a BGGSe crystal for nonlinear seeding of terawatt-class CO2 amplifiers
We demonstrate what we believe to be a new approach to energetic picosecond 10.2-μm pulse generation based on nonlinear mixing of subnanosecond single-frequency 1338-nm pulses and broadband 1540-nm chirped pulses in a BGGSe crystal followed by a grating compressor for the purpose of seeding high-power CO2 amplifiers. The energy of the 10.2-μm pulses exceeding 60 μJ with 3.4%-rms fluctuation can be routinely obtained. Single-shot pulse duration measurement, performed by Kerr polarization rotat...
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Highly efficient octave-spanning long-wavelength infrared generation with a 74% quantum efficiency in a χ(2) waveguide
In a ZnGeP2-based waveguide platform, an octavespanning spectrum covering 5–11 μm is generated through optical parametric generation (OPG). A quantum conversion efficiency of 74% as a new record in LWIR single-pass parametric processes is achieved. The threshold energy is measured as ~616 pJ, reduced by more than 1-order of magnitude as compared to those of MIR OPGs in bulk media. Our prototype micro-waveguide platform could be extended to other χ(2) birefringence crystals and trigger new fro...
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An exceed 60% efficiency Nd:YAG transparent ceramic laser with low attenuation loss effect
Here, attenuation loss effect and laser performance enhancement of Nd:YAG transparent ceramics were investigated. Using a 0.6 at.% Nd:YAG ceramic rod with 3 mm diameter and 65 mm length, the scattering coefficient and absorption coefficient at 1064 nm were measured to be 0.0001 cm-1 and 0.0017 cm-1 , respectively. For the 808 nm side-pumped laser experiment, an average output power of 44.9 W was achieved with an optical-to-optical conversion efficiency of 26.4%, which was nearly same with th...
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High Pulse Energy, Narrow Linewidth 6.45 µm from an Optical Parametric Oscillator in BaGa4Se7 Crystal
This paper presents a high pulse energy, narrow linewidth, mid-infrared (MIR) laserat 6.45 µm, based on a BaGa4Se7 (BGSe) crystal optical parametric oscillator (OPO) pumped by1.064 µm laser. The maximum pulse energy at 6.45 µm was up to 1.23 mJ, with a pulse width of 24.3 ns and repetition rate of 10 Hz, corresponding to an optical–optical conversion effificiency of 2.1%, from pump light 1.064 µm to idler light 6.45 µm. The idler light linewidth was about 6.8 nm.Meanwhile, we accurately calcu...
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43 W, 7 ns constant pulse duration, high-repetition-rate langasite cavity-dumped Ho:YAG laser and its appilcation in mid-infrared ZGP OPOs
In this paper, we demonstrate a langasite (LGS) electro-optic Ho:YAG cavity-dumped laser that suppresses the gain dependence of pulse duration in Q-switched lasers. A constant pulse duration of 7.2 ns was achieved at a repetition rate of 100 kHz. Benefiting from the LGS crystal has no significant reverse piezoelectric ring effect and thermally induced depolarization, a stable pulse train was achieved at an output power of 43 W. For the first time, the application of cavity-dumped laser in mi...
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