We investigated room-temperature pulsed lasing in heavily doped Fe:ZnSe single crystals. The active elements were pumped by a Q-switched Cr ³⁺ :Yb ³⁺ :Ho ³⁺ :YSGG laser operating at 2.87 μm. Our results show that the generation of short laser pulses has a deep high-frequency modulation associated with relaxation dynamics in Fe:ZnSe. The lasing regime obtained in this study provides a straightforward way to generate mid-IR single nanosecond pulses at moderate pump energies. Moreover, we found a relation between the lasing pulse duration and the concentration of Fe ²⁺ doping ions, and we experimentally demonstrated pulse shortening in heavily doped active crystals. Single-pulse lasing with an FWHM pulse duration of ∼2.8 ns was achieved in ZnSe crystals doped with 2.3 · 10 ¹⁹ cm ^-3 Fe ²⁺ ions. The demonstrated single-pulse lasing regime is applicable for seeding high-power mid-IR laser systems.

A single-wavelength compact diode-pumped solid-state laser based on a single-mode waveguide with a diameter of 20 µ m and graphene saturable absorber is presented in this work. The total reflection coefficient of the intracavity interferometer has a significant effect on the level of intracavity losses. By accurate controlling the intracavity losses a stable continuous wave passive mode-locking at wavelength of 1064 nm with a pulse repetition rate of 9.5 GHz was obtained.

A compact waveguide Tm:YAP laser with a pulse repetition rate of 8 GHz is developed. A controllable change in the intracavity loss provides contin

A hybrid laser source with a profiled laser pulse shape is presented. It is designed with a fiber pulse shaping system and a two-stage solid-state amplifier based on two gain modules with pulsed transverse diode pumping. The ability to control the pulse shape of the hybrid laser source pulse is demonstrated, and rectangular and stepped pulse shapes with a radiation wavelength of 1064.15 nm, duration of 20 ns, repetition rate of 2 Hz, and output energy of 1 J are obtained. The resulting shapes are achieved by controlling the temporal shape of the pulses of the master oscillator to compensate for the effect of gain saturation in solid-state amplifiers. The dynamics of the pulse shape evolution as a function of the electrical pump energy in the gain modules is traced.

A passive mode locking Nd:YAG waveguide laser with a gigahertz pulse repetition rate is presented. Single-layer graphene is used as the saturable absorber. A tubular waveguide in the active medium...