We have investigated the multi-spectral line output characteristics of a CO2 pulsed laser at multi-atmospheric pressure. The pulse waveforms, wavelengths, and energies of the output spectral lines and the small-signal gains of the full spectrum were measured at 3, 4, and 6 atm. To explain the experimental results and predict the output at higher pressure, a modified six-temperature multi-frequency dynamic model of the regular and sequence band lines was developed. The output spectrum varying from the 10P to 9R band with the increase of pressure was studied theoretically and experimentally. In addition, the gains of the 9R(16), 9P(16), 10R(16), and 10P(16) lines at 3 to 14 atm were simulated and measured, providing insights into variation regulation of the four band gains as pressure increases.
We demonstrated a periodically poled magnesium-oxide-doped lithium niobate (MgO:PPLN) optical parametric oscillator (OPO) pumped by a Nd-doped MOPA laser (1.064 μm) with a high peak power, tunable repetition rate, short pulse width. The OPO was designed as an extral cavity singly resonant OPO. By adopting optical pulse selection technology, the repetition rate could be adjusted in the range of 30-50 kHz without affecting the beam quality of the laser. The wavelength of output signal light was 1.57 μm when the polarization period and operating temperature of the MgO:PPLN were 30.5 μm, and 95 °C, respectively. In the range of 30-50 kHz, the pulse width of the laser was less than 4.9 ns and the average power was greater than 8.43 W. A maximum peak power of 63.9 kW was obtained at a repetition rate of 30 kHz, with a corresponding pulse width of 4.4 ns.
We present a cavity compensation technique based on a tunable long-wave infrared zinc germanium phosphide ZnGeP2 (ZGP) optical parametric oscillator (OPO). The slope efficiency increased from 3.6% to 7.0% at 9.15 μm after using the cavity compensation technique in the tuning range of 8.02 to 9.15 μm. We used a Q-switched 2.1 μm Ho:YAG laser pump source with a pulse repetition frequency of 10 kHz. Under the incident pump power of 23.03 W, the maximum average idler output power of 2.16 W at 8.02 μm was achieved with a pulse width of 21.5 ns and spectral bandwidth of 29.5 nm; the slope efficiency was 16.5%. To the best of our knowledge, this is the first application of the cavity compensation technique in tunable long-wave infrared ZGP OPO.
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