1,720,964 research outputs found
Compact Femtosecond Nd:glass Lasers Pumped by a Low-Power Single-Mode Laser Diode
No full textCompact femtosecond Nd:glass lasers pumped by a single mode 200-mW laser diode are discussed. Different optical configurations for dispersion compensation are considered. Pulses as short as 80 fs have been abtained, with 10-20 mW output power which is more than enough for seeding ultrafast amplifiers
80-fs Nd:silicate glass laser pumped by a single-mode 200-mW diode
No full textA Nd3+-doped Schott LG680 silicate glass laser was pumped with a single-mode 200-mW diode. Efficient cw operation was demonstrated with 37.5 mW output power and 36% slope efficiency. Passive mode-locking with a semiconductor saturable absorber mirror yielded 80-fs pulses with a two-prism setup. Alternatively, pulses of ~ 200-fs, tunable over the range 1058-1076 nm, were obtained with either slit-tuning or a single-prism dispersive resonator. Output powers from 6 to14 mW have been measured
Efficient femtosecond Yb:YAG laser pumped by a single-mode laser diode
No full textWe have investigated a single-mode, 300-mW laser diode for pumping at 935 nm a Yb:YAG laser passively mode-locked by a semiconductor saturable absorber. Relatively short pulse generation (156 fs), tunable across the 1033 - 1059 nm range with 30% optical-to-optical efficiency, has been demonstrated. Therefore, contrarily to what previously believed, compact diode-pumped ultrafast Yb:YAG oscillators can reliably and efficiently deliver pulses in the range of ≈ 100 - 200 fs with few tens of mW, which are very appealing for bio-diagnostics and amplifier seeding applications
40-fs Yb3+:CaGdAlO4 laser pumped by a single-mode 350-mW laser diode
No full textWe report the results of the investigation on a passively mode-locked Yb3+:CaGdAlO4 laser, pumped by a single transverse mode laser diode emitting 350 mW at 980 nm. This particular pump source allows efficient pumping with a nearly TEM00 beam and minimal thermal load, making the optimization of the mode-locking performance more straightforward than with higher-power multimode beams. Indeed, using a semiconductor saturable absorber mirror and extra-cavity dispersion compensation, pulses as short as 40 fs (31-nm spectrum) have been measured, tunable across 20 nm with 15-mW output power. Slightly longer Fourier-limited 46-fs pulses with 33 mW output power directly from the oscillator have been achieved, using a different saturable absorber mirror. Such overall performance, especially considering these are among the shortest pulses generated in diode-pumped ytterbium lasers, confirms the excellent qualities of Yb3+:CaGdAlO4
Diode-pumped passively mode-locked tunable Yb:CALGO solid-state laser
No full textIn this paper, we present a simple, compact, and efficient Yb:CALGO laser system that can produce sub-100 fs
pulses easily tunable over a 38 nm wide wavelength range between 1034 and 1072 nm. The laser is passively mode
locked with a semiconductor saturable absorber and generates up to 90 mW output power (for 230 mW absorbed
pump), using a single prism for both tuning and dispersion compensation
Efficient and widely tunable, single-mode diode-pumped sub-100 fs Yb3+:CaGdAlO4 laser
No full textWe present a compact and efficient single-mode diode-pumped, passively mode-locked Yb3+:CaGdAlO4 laser. Sub-100 fs pulses, tunable over 30 nm, with output power exceeding 50 mW at any operational wavelength were obtained
Ablation rate assessment of GHz femtosecond laser in burst mode through fast numerical simulation
No full textIn this work, the use of an innovative, compact femtosecond laser operating in the GHz regime for laser ablation and microtexturing is investigated and discussed. The processing performances of burst mode for pulses shot in the GHz regime are
numerically simulated. The proposed ablation model is based on the two-temperature model and considers, in a simplified way, the effect of plasma. The numerical results are compared in terms of ablation depth with experimental investigations on stainless steels. The numerical outputs allow an understanding of the influence of different process parameters and support the selection of the operating window where GHz laser became competitive with traditional ultrashort laser sources in the MHz regime
99-fs Nd:glass laser mode-locked with carbon nanotube saturable absorber mirror
No full textMode-locked operation of Nd:silicate glass with both single-walled carbon nanotubes (SWCNT-SAM) and semiconductor saturable absorber mirrors (SESAM) has been investigated. SWCNT-SAM mode-locking has been optimized in Nd-doped bulk lasers for the first time, yielding 99-fs pulses at 1070 nm. Using a SESAM for comparison pulses as short as 87 fs and a tuning range of 30 nm was achieved. Related to the applied 200-mW single-mode laser diode as pump source the lasers were characterized by high efficiency and low threshold. The optimized low-power pump setup yielded a remarkable slope efficiency of 46.5% in the cw regime
Femtosecond Nd:glass lasers mode-locked with carbon nanotube saturable absorber mirror
No full textWe present femtosecond Nd:glass lasers pumped by single-mode 200-mW diodes, mode-locked by single-walled carbon nanotube saturable absorbers. We obtained sub-150-fs and sub-100-fs stable pulse trains with phosphate and silicate glasses, respectively
Spectroscopy and efficient laser emission of Yb3+:LuAG single crystal grown by micro-PD
No full textA LuAG shaped rod crystal, doped with Yb3+, has been grown by μ-PD technique. The crystal diameter was about 3 mm and the length around 130 mm. A complete spectroscopic investigation in the temperature range 10–300 K is reported and data has been utilized to model the laser behavior. In the laser experiment
the Yb:LuAG sample was placed in an X cavity and pumped longitudinally obtaining an efficient CW laser emission. The Yb:LuAG laser yielded a maximum output power of 23 mW with a slope efficiency of 32% and a threshold around 35 mW, at lasing wavelength of 1030 nm. No significant depolarization effects
were observed, indicating a crystal growth with negligible stress. The output beam profile was investigated, yielding M2≈1.0 in both directions, further confirming the good optical quality of the sample
- …
