Optimized diode-pumped passive Q-switched ytterbium–erbium glass laser

LD-pumped erbium and neodymium lasers with high energy and output beam quality

“…Based on the data obtained during theoretical and experimental investigations [2][3][4][5][6][7] of the ytterbium-erbium glass AE and InGaAs/AlGaAs LDA properties the series of 1.54 μm eye-safe portable laser sources (see Fig.1) with the output energy for the range of (3 -12) mJ. They emit the light pulses with the duration of 20-25 ns or less (pulse repetition rate up to 5 Hz).…”

“…Small values of M 2 are achieved due to the introducing into the laser resonator the AE element with the rectangular cross-section and the ends cut at the Brewster angle. The beam cross-section distortions arisen in such resonator were corrected by application of the prism-type telescope element [4]. The measurement of the M 2 parameter was carried out with the help of the CCD camera as well as the "knife"-type installation.…”

“…We have undertaken several attempts directed to the realization of similar approaches for the LD-pumped ytterbiumerbium glass and Nd:YAG lasers [1][2][3][4][5][6]. For example, the critical relation between the near field fill factor of the laser diode arrays (LDAs) intended for pumping the Yb,Er-glass laser (the lasing wavelength of 1.54 μm) and the laser threshold pump power was reviled theoretically and experimentally [3].…”

“…As a result, a condition for the optimal adoption of the InGaAs/AlGaAs laser diode array heterostructure parameters to the LDA-transversally pumped Yb,Er-glass laser has been proposed. The developed simulation model (in particular, it includes the AE unpumped areas) allows to describe correctly the operation of the LD-pumped Q-switched Yb,Er-glass laser with the output pulse energy up to 16.5 mJ [4]. Efforts aimed to the selection of the most suitable front mirror reflection coefficient value for the powerful InGaAs/AlGaAs LDAs have been undertaken also.…”

Er 3+ ,Yb 3+ :glass-Co 2+ :MgAl 2 O 4 diffusion bonded passively Q-switched laser

“…σ gs /γσ , δ = σ es /σ gs , and L = 2α sc (l + l s ), with T 0 being the small signal transmission of Co:spinel, L the internal loss per round trip, σ gs the Co 2+ ground state absorption crosssection at the lasing wavelength, σ es the Co 2+ excited state absorption cross-section at the lasing wavelength, α sc the scattering loss, l the length of phosphate glass, and l s the length of saturable absorber. Under a pump power of 200 mW, the typical parameters above are follows: [33] 10) and (11), the output pulse energies of 59 µJ in bonded component and 36 µJ in unbonded component for the fundamental TEM 00 mode are obtained, respectively. Obviously, the laser output from the bonded component is about sixty percent higher than that of the unbonded component.…”