43W picosecond laser and second-harmonic generation experiment (original) (raw)
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High-Efficiency 2-mJ 5-kHz Picosecond Green Laser Generation by Nd:YAG Innoslab Amplifier
IEEE Photonics Technology Letters, 2015
A high efficiency picosecond (ps) 532 nm green laser with high pulse energy and high peak power at 5 kHz repetition rate was demonstrated by second harmonic generation (SHG) from a 1064 nm master oscillator power amplifier (MOPA). The MOPA was based on the Innoslab structure under diode directly pumping, producing 4.8 mJ, 25 ps fundamental laser at the repetition rate of 5 kHz after a 3-stage Innoslab amplification system. With a pulse energy of 2.93 mJ in the fundamental and using a type I noncritically phase matched lithium triborate (LBO) crystal, the pulse energy of SHG was up to 1.96 mJ per pulse with a pulse width of 18.9 ps, which corresponds to a peak power of 104 MW in the green and SH conversion efficiency as high as 67 %. The SHG green beam quality factor was measured to be M 2 =1.75.
Chinese Optics Letters, 2012
We present a near diffraction-limited 1 064-nm Nd:YAG rod laser with output power of 82.3 W (M 2 ≈1.38). The power fluctuation over two hours is better than ±1.1%. Pulsed 1 064-nm laser with an average power of 66.6 W and pulse width of 46 ns are achieved when the laser is Q-switched at a repetition rate of 10 kHz. The short pulse duration stems from the short cavity as well as the high-gain laser modules. Using intracavity-frequency-doubling, a 35.0-W near diffraction-limited 532-nm green laser (M 2 ≈1.32) is achieved with a pulse width of 43 ns.
Review of Scientific Instruments, 2010
We have developed an efficient and high power repetitively Q-switched diode-pumped intracavity frequency doubled Nd:YAG/LiB 3 O 5 based green laser capable of generating 124 W of average green power with 50 ns pulse duration in a highly compact and robust linear cavity configuration. The pump to green beam conversion efficiency is 16.8% and the overall wall-plug efficiency is 8.3%. The long term power stability is excellent with Ϯ0.4 W variation at the maximum output power and Ϯ2% amplitude fluctuation with Ϯ2.9 ns timing jitter. The M 2 parameter of the green beam was measured to be ϳ27. This, combined with the short pulse duration and the high average power, makes this laser ideal for pumping ultrafast Ti:sapphire laser amplifier systems and for micromachining applications.
High-power diode-pumped picosecond Nd^3+:YVO_4 laser
Optics Letters, 1997
A diode-pumped Nd(3+):YVO(4) laser passively mode locked by a nonlinear mirror based on second-harmonic generation has been developed. Pumping with a fiber-coupled 10-W diode array, we generated nearly diffraction limited, linearly polarized 11-ps pulses at 1064nm, with average power of 2.7 W at a 150-MHz repetition rate. Pulses as short as 7.9 ps were measured with reduced output power (1.35 W) by optimal focusing in the nonlinear crystal.
130-W picosecond green laser based on a frequency-doubled hybrid cryogenic Yb:YAG amplifier
Optics Express, 2009
130-W average-power picosecond green laser pulses at 514.5 nm are generated from a frequency-doubled hybrid cryogenic Yb:YAG laser. A second-harmonic conversion efficiency of 54% is achieved with a 15-mmlong noncritically phase-matched lithium triborate (LBO) crystal from a 240-W 8-ps 78-MHz pulse train at 1029 nm. The high-average-power hybrid laser system consists of a picosecond fiber chirped-pulse amplification seed source and a cryogenically-cooled double-pass Yb:YAG amplifier. The M 2 value of 2.7, measured at 77 W of second-harmonic power, demonstrates a good focusing quality. A thermal analysis shows that the longitudinal temperature gradient can be the main limiting factor in the second-harmonic efficiency. To our best knowledge, this is the highestaverage-power green laser source generating picosecond pulses.
Optics & Laser Technology, 2004
We analyzed a linear cavity for intracavity frequency doubling of a diode-pumped acousto-optic Q-switched Nd:YAG rod laser, and showed that a green laser beam with a short pulse width can be generated e ciently. A green laser output power of 73 W corresponding to the 83.9% of maximum IR output power was obtained with a 40 ns pulse width at a 10 kHz repetition rate. A green output power of 40 W with a 35 ns pulse width was measured at a 5 kHz repetition rate. Minimum laser pulse width of approximately 32 ns was obtained around 1 kHz repetition rate for both green and IR laser beams.
Applied Physics B, 2002
We report an experimental study of the second harmonic generated in type I interaction by a Ti:Sa laser operating in the picosecond regime at 786 nm in LBO crystals. A joint characterization of the dependence of conversion efficiency and spatial beam quality on crystal length and degree of pump focusing is given. A simple heuristic formula, reproducing over a broad range of parameters the predictions of classical Boyd-Kleinman theory, is derived and compared with the experimental results. The conditions for the optimization of the generation process using an elliptically focused pump beam are quantitatively evaluated.
Diode pumped Ho:YAG and Ho:LuAG lasers, Q-switching and second harmonic generation
Applied Physics B, 2011
Direct diode pumped Ho:YAG generated laser pulses at 2.12 µm with an optical to optical slope efficiency of 0.24. Ho:YAG and Ho:LuAG laser rods were evaluated with both wide and narrow bandwidth pump diodes. The laser wavelength varies with the level of pumping and optical design. This variation was found to be predictable. Second harmonic at 1.06 µm was produced in a 6.0 mm long BBO crystal.
2008 IEEE PhotonicsGlobal at Singapore, IPGC 2008, 2008
Single-frequency operation of diode-pumped Nd:YLiF 4 and Nd:YVO 4 continuous-wave (cw) ring lasers are investigated in the 1.31-1.34μm range, together with their intracavity second-harmonic generation to the red spectral range (0.65-0.67μm) using either BiB 3 O 6 (BiBO), LiB 3 O 5 (LBO) or periodically-poled KTiOPO 4 (ppKTP). Smooth singlelongitudinal mode wavelength tuning over Δλ~3-4 nm within the gain bandwidths could be achieved, with a watt-level output at gain centers in the near-IR and red range. Unlike with the birefringence phase-matched crystals, second-harmonic generation using ppKTP leads to various dynamical regimes, from narrow-band continuous-wave to broadband self modelocked operation triggered by χ (2) : χ (2) second-order Kerr-lens cascaded nonlinear interactions.