Multi-wavelength diode-pumped Nd:LGGG picosecond laser (original) (raw)
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Multi-wavelength Nd:GAGG picosecond laser
Optical Materials, 2010
Laser operation near 1.06 lm by a diode-pumped Nd:Gd 3 Al x Ga (5Àx) O 12 (x = 0.94) (Nd:GAGG) disordered crystal has been investigated. Free-running oscillation, with a slope efficiency as high as 55% and 256 mW output power, was achieved with 500 mW absorbed power using a 1-W laser diode for pumping. Stable passive mode-locking with dual-wavelength operation was obtained with a semiconductor saturable absorber mirror (SAM) and a single-prism, dispersion-compensated cavity.
Optical spectroscopy and diode-pumped laser performance of Nd/sup 3+/ in the CNGG crystal
IEEE Journal of Quantum Electronics, 2001
We have exploited the broad absorption and emission bandwidth of the laser crystal Ca 3 (NbGa) 2 Ga 3 O 12 doped with Nd 3+ to develop a tunable and mode locked diode-pumped 1 06 m laser. We also present the fluorescence and excitation spectra at different crystal temperatures from 10 to 298 K. The spontaneous transition probabilities, the branching ratios, and the radiative lifetime are calculated by means of the Judd-Ofelt theory and compared with the experimental results. The stimulated emission cross-sections of the most important transitions have been calculated and compared with laser results. Employing a 2-W laser diode as a continuous-wave pump source, we have been able to tune the emission wavelength in the range 1053-1074 nm. Active mode-locking yielding pulses of 9.6, 18, and 19.7 ps at the three main emission peaks of 1058.6, 1061.2, and 1065.3 nm, respectively, was also demonstrated.
Chinese Optics Letters, 2016
A stable passively mode-locked laser of Nd 3þ :Gd 0.5 Y 2.5 Al 5 O 12 (Nd:GYAG) disordered crystal is experimentally investigated both using Z-type and W-type cavities with a semiconductor saturable absorbed mirror. The continuous-wave mode-locked threshold of the absorbed pump power is just 1.8 W. The maximum average output power is 210 mW, which is obtained at the absorbed pump power of 2.3 W. The pulse width is measured to be 11.1 ps assuming a Gaussian shape.
Optics Express, 2007
A bulk crystal of Er 3+ :Yb 3+ :LaMgB 5 O 10 was grown successfully by the top seeded solution growth (TSSG) method. The spectroscopic characterization of this material, including the polarized absorption and fluorescence spectra and the fluorescence decay curve, were recorded. The fluorescence quantum efficiency of the 4 I 13/2 level of Er 3+ ions and the efficiency of energy transfer from Yb 3+ to Er 3+ ions were estimated. Continuous-wave laser output of 160 mW at 1567 nm was realized under the absorbed pump power of 3.1 W in a hemispherical cavity. When the output coupler transmission was 1.7% the absorbed pump threshold was 1.5W and the slope efficiency of the laser was 10.1%. The results show that Er 3+ :Yb 3+ :LaMgB 5 O 10 crystal is a promising laser material.
Passively mode-locked femtosecond laser with an Nd-doped La₃Ga₅SiO₁₄ disordered crystal
Optics express, 2014
We experimentally prove the broad emission band of Nd:LGS disordered crystal and demonstrate a diode-pumped passively mode-locked femtosecond Nd-doped La₃Ga₅SiO₁₄ (Nd:LGS) laser for the first time. With a birefringent filter inserted into the cavity, the tunable continuous wave (CW) laser of over 60 nm from 1045.2 nm to 1105.3 nm is achieved, which is the widest tuning range with Nd-doped crystals to our knowledge. Further in mode-locked operation, femtosecond pulses with pulse duration of 381 fs, average output power of 75 mW and repetition rate of 134.4 MHz are obtained at the central wavelength of 1066 nm. It is suitable to be a compact seed for femtosecond laser amplifiers.
Applied Optics, 1992
Passive stable mode locking of a pulsed Nd:YAG laser was achieved with a long-decay-time saturable absorber in a coupled-cavity longitudinal scheme. In this configuration the saturable absorber (LiF:F 2 -) also behaves as an active medium in intracavity pumping and is the load for the Nd laser. This arrangement provides proper lasing conditions for the F 2 -color centers so that the cavity photon lifetime of the color centers is much shorter than the cavity round-trip time of the Nd laser. In this way the Nd pulses are simultaneously Q switched and mode locked. The pulses show a stable temporal profile, with an envelope of 160 ns and a train of mode-locked pulses of less than 200-ps duration.
Q-switched and continuous-wave mode-locking of a diode-pumped Nd:Gd0.64Y0.36VO4−Cr4+:YAG laser
Applied Physics B, 2005
We report on a diode-pumped passively modelocked Nd:Gd 0.64 Y 0.36 VO 4 laser with a Cr 4+ :YAG saturable absorber. Q-switched mode locking (QML) with 90% modulation depth was obtained. The peak power of the modelocked pulse near the maximum of the Q-switched envelope was estimated to be about 1.7 MW at the pump power of 12 W. Besides QML, continuous-wave mode locking was also experimentally realized, for the first time to our knowledge, in the laser under a strong intracavity pulse energy fluence. The mode-locked pulse width is about 2.96 ps at a repetition rate of 161.3 MHz.
Applied Optics, 1992
Passive stable mode locking of a pulsed Nd:YAG laser was achieved with a long-decay-time saturable absorber in a coupled-cavity longitudinal scheme. In this configuration the saturable absorber (LiF:F 2-) also behaves as an active medium in intracavity pumping and is the load for the Nd laser. This arrangement provides proper lasing conditions for the F 2-color centers so that the cavity photon lifetime of the color centers is much shorter than the cavity round-trip time of the Nd laser. In this way the Nd pulses are simultaneously Q switched and mode locked. The pulses show a stable temporal profile, with an envelope of 160 ns and a train of mode-locked pulses of less than 200-ps duration.
Laser Physics
In this paper, a low threshold diode pumped passively mode-locked Nd:YAG laser has been demonstrated by using a semiconductor saturable absorber mirror. The threshold power for continuous-wave mode-locking is relatively low, about 3.2 W. The resonator stability across the pump power has been analytically examined. Moreover, the mode overlap between the pump beam and the laser fundamental mode has been simulated by MATLAB software. Adopting Z-shaped resonator configuration and suitable design of the resonator's arm lengths, has enabled the author to prepare mode-locking conditions, and obtain 40 ps pulses with 112 MHz pulse repetition rate. The laser output was stable without any Q switched instability. To the best of our knowledge, this is the lowest threshold for CW mode-locking operation of a Nd:YAG laser.