Compact, high power FIR NH3 laser pumped in a three mirror CO2 laser cavity

NH3 laser THz emission under optical pumping by “long” (∼100 µs) CO2 laser pulses

“…Several research groups studied in detail NH 3 lasing with a wavelength of ∼152 μm for the CO 2 laser pump line 10P(32) and ∼90 μm for the 9R( 16) pump line [9][10][11][12] . Such an interest in these wavelengths of the THz NH 3 laser is apparently associated, firstly, with the high efficiency of emission conversion (1.6% for ∼152 μm [10] and 1.7% for ∼90 μm [9] ), and, secondly, with the prospect of using such THz emission for plasma diagnostics in electrodynamic accelerators and tokamaks with a strong magnetic field [13] . Therefore, for these wavelengths, in contrast to others, the shape of a THz laser pulse was studied in comparison with a pump pulse.…”

“…In Ref. [10], the shape of a single-line pulse with a wavelength of ∼152 μm was the same as for a CO 2 laser pulse of ∼300 ns duration. At the same time, a lasing pulse with a wavelength of ∼90 μm started only after the first, most powerful peak of the pump pulse and replicated the shape of a low-energy "tail" of a CO 2 laser pulse [12] .…”

“…However, it should be noted that up to now the cascade mechanism of THz NH 3 laser operation optically pumped by a CO 2 laser has not been studied in detail. THz NH 3 laser pulse temporal shapes were mainly detected under experimental conditions, when lasing took place at a single wavelength [9][10][11][12] , or the pulse shape was only studied for a single one out of a set of wavelengths [14,15] .…”

An efficient optically pumped terahertz laser without metal-mesh mirrors

“…Optically pumped terahertz lasers (OPTLs) are widely used THz radiation sources because of their high power, high efficiency and wide spectral range [8][9][10][11] . These OPTLs are usually pumped by CO 2 lasers.…”