High-power high-beam-quality sealed-off master oscillator – power amplifier system oscillating in the middle infrared spectral range on strontium atomic transitions

Abstract

High-beam-quality sealed-off master oscillator – power amplifier system is developed and studied based on an atomic strontium vapor laser and delivering high-power laser radiation in the middle infrared spectral range. A diffraction self-filtering of the laser radiation is used to reduce the laser beam divergence to the ultimate diffraction limit. A new optical design is utilized for the master oscillator to visualize the optical path through the entire optical scheme. A large-bore sealed-off laser tube is developed and studied with a stable cavity and is applied as a power amplifier as well. Precise microprocessing of optical grade fused quartz is also performed.

New diffraction-limited laser systems with variable output parameters operating in visible spectral range on copper atomic transitions for advanced material micromachining

“…Applying the experimental method described in detail in [10] and the data given in [11] and [12], M 2 is obtained for several laser beam diameters D defined by the PAs aperture and various focal distances f. Table 4 summarizes the results obtained, where d th = f.θ00 is the diameter of a TEM00 Gaussian beam. Average value of M 2 is M 2 av = M 2 1av + M 2 2av = 1.100.…”

“…The Cu pieces are placed between the Al2O3 ceramic inserts. The construction of the CuBr vapor laser tubes, MO and PA pulsed power supplies and their synchronization were described in details in [10]. The average laser power is measured through a calorimetric power-energy meter (Scientech Inc. Vector S310).…”

“…In this paper, beam quality of the laser radiation delivered by a small-bore Cu vapor master oscillator (MO1) operating with a flat-flat stable cavity and a negative branch unstable resonator is compared with the laser radiation of the CuBr vapor MO (MO2), which is similar to the one described in [10]. Two Power Amplifiers (PAs) with CuBr lasant and a considerably increased discharge zone are also studied in two different optical schemes.…”