Synchronously Intracavity-Pumped Picosecond Optical Parametric Oscillators for Sensors.

The research and development of laser systems for intracavity phase interferometry is described. These systems are based on an intracavity synchronously pumped optical parametric oscillator (OPO), enabling the generation of two trains of picosecond pulses inside a single cavity. In such a configuration, it is possible to measure the beat note frequency between two pulses and to very precisely determine the phase difference between them.

Multiwavelength, picosecond, synchronously pumped, Pb(MoO)(WO) Raman laser oscillating at 12 wavelengths in a range of 1128-1360 nm.

In this Letter, a mixed ()() as a new, to the best of our knowledge, active medium with optimized content for a synchronously pumped multiwavelength Raman laser with a combined frequency shift is presented. The unique structure of this crystal resulted in oscillations at 12 closely spaced output wavelengths in a spectral range from 1128 to 1360 nm. The strongest pulse shortening in comparison with nominally pure scheelite-like crystals has been achieved.

Highly efficient, high-energy, picosecond, synchronously pumped Raman laser at 1171 and 1217 nm based on PbMoO crystals with single and combined Raman shifts.

For the first time to our knowledge, the operation of a synchronously pumped ultrafast Raman laser that uses a PbMoO crystal as the active medium has been demonstrated. We achieved efficient Raman conversion in PbMoO from pumping 1063 nm into 1171 and 1217 nm, respectively, at single and combined frequency shifts on stretching and bending Raman modes. The output pulse energy (up to 160 nJ) and peak power (up to 11 kW) of the output picosecond radiation is the highest among all-solid-state synchronously pumped Raman lasers published to date.

Nanosecond parametric Raman anti-Stokes SrWO laser at 507 nm with collinear phase matching.

Collinear phase matching of the Stokes ↔ anti-Stokes interaction for Raman-active crystals with different birefringence was studied theoretically as well as experimentally. It was shown that collinear phase matching of the Stokes ↔ anti-Stokes interaction in low-birefringent crystals can be insensitive to angular mismatch if a phase matching angle is higher than 60. We have developed and experimentally realized an extracavity parametric Raman anti-Stokes laser based on a low-birefringent SrWO.

Long-pulse 4.4-4.6 μm laser oscillations of Fe ions in a ZnMnSe (x = 0.3) crystal pumped by a 1940 nm Tm fiber laser through Cr → Fe energy transfer.

Millisecond-pulse laser operation of Fe ions at 78 K is demonstrated in the ZnMnSe:Fe,Cr (x=0.3) crystal under a Tm fiber 1940 nm laser pumping through a Cr→Fe energy transfer process for the first time, to the best of our knowledge. The laser slope efficiency was 1% with respect to absorbed pumping energy at 1940 nm.