Idler Conversion Efficiency Research Articles

Generation of tunable mid-IR (5.5–9.3 μm) from a 2-μm pumped ZnGeP2 optical parametric oscillator

A tunable mid-infrared optical parametric oscillator (OPO) has been demonstrated using a single ZnGeP2 (ZGP) crystal. A KTP OPO was pumped by an Nd:YAG laser to generate 2.02 μm-signal wave at the output, which is used for pumping a singly resonant angle-tuned ZGP OPO to generate mid-IR tunable from 5.5 to 9.3 μm. Maximum pump to idler (2–8 μm) conversion efficiency obtained, was ∼8.25%, which corresponds to ∼32% quantum efficiency.

CW fibre optical parametric amplifier with net gainand wavelength conversion efficiency > 1

The authors have measured a signal gain of 5 dB and idler conversion efficiency of 4 dB in a CW fibre optical parametric amplifier. The broadening of the idler spectrum resulting from pump dithering used to suppress SBS is observed, and a means to eliminate it is proposed.

Visible BaB2O4 optical parametric oscillator pumped at 355 nm by a single-axial-mode pulsed source

A visible BaB2O4 optical parametric oscillator (OPO) pumped by a single-axial-mode 355-nm source has been demonstrated. An average output power of 140 mW with a signal wave conversion efficiency of 13% and an idler conversion efficiency of 11% for a total conversion efficiency of 24% has been achieved. The oscillator has continuously tuned from 412 nm to 2.55 μm limited by the infrared transmission range of the crystal. Through injection seeding we obtained single-axial-mode OPO operation with a corresponding OPO linewidth of less than 3 GHz.