Frequency doubling of He-Ne laser radiation at 632.8 nm (original) (raw)
Related papers
Fabrication of KDP crystal prisms for second harmonic generation
Optik, 2018
Single KDP crystals were grown from an aqueous solution by the slow cooling method. They were cut into triangular prism-shaped blocks whose angles were determined by type II phase-matching condition for the second harmonic generation (SHG). The 1064 nm laser was shone into the KDP crystals and was partially converted to the 532 nm light. The power of remaining 1064 nm beam was much higher than that of 532 nm SHG beam. Total internal reflection occurred inside the KDP crystals for the 1064 nm beam. The 532 nm beam passed through the crystals and was recorded by a detector. The KDP crystal prisms have two functions: help to measure the output 532 nm radiation accurately, and adjust the power of 532 nm beam by changing the point of incidence of the 1064 nm beam, which improves convenience of the frequency doubler in optical devices.
Optical and Quantum Electronics, 2003
Frequency doubling of spatially limited laser beams in nonlinear crystals is investigated theoretically. It was shown that the major factor, which reduces the second harmonic generation (SHG) efficiency in this case, is a diaphragm aperture effect, caused by influence of extraordinary polarized laser beams. In that case a spatial shift of mutually orthogonally polarized beams of the incident waves relative to each other in perpendicular direction of wave transmission at the entry to crystals lead to increase the efficiency of SHG of limited beams.
43W picosecond laser and second-harmonic generation experiment
Optics Communications, 2009
Combining the advantages of diode-end-pumped Nd: YVO 4 and diode-side-pumped Nd: YAG amplifiers, a high average power and high beam quality picosecond laser is designed. The system delivers a picosecond laser with average power of 43.4 W and good beam quality of M 2 < 1.7. By focusing the high power picosecond laser in LBO crystal, 532 nm green laser with maximal power of 20.8 W is generated and the conversion efficiency of second-harmonic generation reaches 56.4% when 17.7 W green laser obtained from the fundamental frequency laser with power of 31.4 W and beam quality of M 2 < 1.25.
60 Percent Efficiency Second Harmonic Generation from 12.8 Μm Radiation
Optics Communications, 1980
Sixty percent single pass second-harmonic power conversion efficiencies are reported in Te pumped with a 12.8 pm NH3 laser source. Peak powers greater than 300 kW are measured at 6.4 pm external to the Te crystal in pulses of about 1 ns full width at half maximum-Pulse train energies greater than 1 mJ are measured.
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.
Laser Physics Letters, 2013
The second harmonic generation efficiency was studied for the single crystalline potassium dihydrogen phosphate matrix with incorporated TiO 2 nanocrystals in the field of the mode-locked Nd:YAG laser pulses. For the first time the frequency conversion efficiency gain was observed for KDP:TiO 2 single crystal (SC) instead of KDP SC due to the internal self-focusing effect of the pump beam caused by the giant cubic nonlinear optical response of the embedded nanoparticles.
Spatial and energy parameters of laser radiation and second harmonic upon self-frequency doubling
Quantum Electronics, 2005
The intracavity second-harmonic generation of laser radiation in an active nonlinear crystal is studied. The spatial distributions of the intensity and power of laser radiation and its second harmonic are calculated by the method of numerical simulations as functions of the parameters of the resonator, active nonlinear crystal, and pump. The analysis is performed for a periodically poled Nd : Mg : LiNbO 3 crystal taking diffraction into account.
Optics Communications, 1997
A periodically-poled flux-grown KTP crystal was used for first order quasi-phase-matched (QPM) second harmonic generation of a Nd:YAG laser. The normalized conversion efficiency of the 1 cm long, 0.5 mm thick sample was 1.28% W-'. A lower limit on the nonlinear coefficient of KTP, d,, 2 14.9 ) 1.5 pm/V was derived from these measurements. The temperature and wavelength tuning coefficients near 1064 nm were determined. The same device was also used for third order QPM frequency doubling of 784 nm light, and the normalized conversion efficiency in this case was 0.12% W-'. 0 1997 Elsevier Science B.V.