Abstract
A high-energy, ns, narrow-linewidth optical parametric oscillator and amplifier system based on large-aperture periodically poled Rb:KTP is presented. The 2 µm seed source is a singly resonant OPO locked with a transversely chirped volume Bragg grating, allowing a wavelength tuning of ~ 21 nm and output linewidth of 0.56 nm. A maximum output energy of 52 mJ and conversion efficiency of 36% was obtained from the amplifier for a pump energy of 140 mJ. The high-energy and the robust and narrow dual-wavelength spectra obtained make this system an ideal pump source for difference frequency generation-based THz generation schemes.
Highlights
Development of high-energy, narrowband coherent midinfrared sources has rapidly increased over the past few decades
The volume Bragg grating (VBG) optical parametric oscillators (OPO) was driven below saturation where the generated output was spectrally narrow and free from unwanted back-conversion processes
A broad parametric gain bandwidth experienced by type-0 OPO with VBG spectral narrowing can lead to generation of equi-spaced frequency sidebands owing to cascaded four-wave mixing [25]
Summary
Development of high-energy, narrowband coherent midinfrared sources has rapidly increased over the past few decades. A pump depletion of 21.6% was measured for the OPO at maximum pump energy, which corresponds well with the calculated overall conversion efficiency. The large-aperture PPRKTP crystals would allow further energy scaling of the OPO output if a higher-energy overall pump budget would be available.
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