Simulation and experimental results of a high-gain two-stage and double-pass off-axis Nd:YVO picosecond laser amplifier.

A high-gain two-stage double-pass off-axis : picosecond laser amplifier has been developed. The comprehensive influence of crystal doping concentration and pump beam quality on the small-signal gain of the : amplifier is theoretically analyzed with a model developed by considering energy transfer upconversion and pump light absorption saturation effect. The thermal effect of : crystal with different doping concentrations, undoped end cap lengths, and pump beam quality is investigated as well.

Few-layer GaSe nanosheet-based broadband saturable absorber for passively Q-switched solid-state bulk lasers.

In this paper, few-layer two-dimensional (2D) GaSe nanosheets were fabricated and utilized as broadband saturable absorbers (SAs) for passively -switched (PQS) solid-state bulk lasers operating at 1.06 and 1.99 µm.

Scan efficiency of structured illumination in iterative single pixel imaging.

Single-pixel imaging (SPI) is an innovative technique that images an object from non-pixelated detection. To do so, SPI has to conduct structured illumination that functions as a way to scan the object. The illumination basis and corresponding scanned intensities are then used for correlation measurement to reconstruct an image.

Passively Q-switched mid-infrared laser pulse generation with gold nanospheres as a saturable absorber.

High-quality gold (Au) nanospheres (Au-NPs) with a diameter of 52 nm were prepared by the seeded growth method. The mid-infrared (MIR) nonlinear saturable absorption properties were measured by a balanced twin-detector measurement technique. With the as-prepared Au-NPs saturable absorber (SA), an efficient passively Q-switched laser was realized at 2.