POLARIZATION INSENSITIVE QUASI-PHASE-MATCHED SECOND HARMONIC GENERATION

Polarization insensitive second harmonic generation (SHG) is proposed in an electro-optic (EO) tunable periodically poled Lithium Niobate (PPLN). The PPLN consists of four sections. External electric fields could be selectively applied to them to induce polarization rotation between the ordinary and extraordinary waves. If the domain structure is well-designed, the fundamental wave with an arbitrary polarization state can be frequency doubled efficiently in this special PPLN.

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Noise Analysis of Second-Harmonic Generation in Undoped and MgO-Doped Periodically Poled Lithium Niobate

Advances in OptoElectronics ◽

10.1155/2008/428971 ◽

2008 ◽

Vol 2008 ◽

pp. 1-10 ◽

Cited By ~ 3

Author(s):

Yong Wang ◽

Jorge Fonseca-Campos ◽

Wan-guo Liang ◽

Chang-Qing Xu ◽

Ignacio Vargas-Baca

Keyword(s):

Lithium Niobate ◽

Second Harmonic Generation ◽

Harmonic Generation ◽

Second Harmonic ◽

Fundamental Wave ◽

Sh Wave ◽

Periodically Poled ◽

Periodically Poled Lithium Niobate ◽

Noise Characteristics ◽

532 Nm

Noise characteristics of second-harmonic generation (SHG) in periodically poled lithium niobate (PPLN) using the quasiphase matching (QPM) technique are analyzed experimentally. In the experiment, a0.78 μm second-harmonic (SH) wave was generated when a 1.56 μm fundamental wave passed through a PPLN crystal (bulk or waveguide). The time-domain and frequency-domain noise characteristics of the fundamental and SH waves were analyzed. By using the pump-probe method, the noise characteristics of SHG were further analyzed when a visible light (532 nm) and an infrared light (1090 nm) copropagated with the fundamental light, respectively. The noise characterizations were also investigated at different temperatures. It is found that for the bulk and waveguide PPLN crystals, the SH wave has a higher relative noise level than the corresponding fundamental wave. For the same fundamental wave, the SH wave has lower noise in a bulk crystal than in a waveguide, and in MgO-doped PPLN than in undoped PPLN. The 532 nm irradiation can lead to higher noise in PPLN than the 1090 nm irradiation. In addition, increasing temperature of device can alleviate the problem of noise in conjunction with the photorefractive effect incurred by the irradiation light. This is more significant in undoped PPLN than in MgO-doped one.

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Periodically poled lithium niobate by electron beam: irradiation conditions and second harmonic generation

10.1117/12.406455 ◽

2000 ◽

Cited By ~ 1

Author(s):

C. Restoin ◽

Vincent Couderc ◽

Claire Darraud-Taupiac ◽

J.-Louis Decossas ◽

J.-C. Vareille ◽

...

Keyword(s):

Electron Beam ◽

Lithium Niobate ◽

Second Harmonic Generation ◽

Harmonic Generation ◽

Electron Beam Irradiation ◽

Second Harmonic ◽

Beam Irradiation ◽

Periodically Poled ◽

Periodically Poled Lithium Niobate

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Second Harmonic Generation Using an All-Fiber Q-Switched Yb-Doped Fiber Laser and MgO:c-PPLN

Advances in OptoElectronics ◽

10.1155/2008/956908 ◽

2008 ◽

Vol 2008 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Yi Gan ◽

Xijia Gu ◽

Joyce Y. C. Koo ◽

Wanguo Liang ◽

Chang-qing Xu

Keyword(s):

Second Harmonic Generation ◽

Fiber Laser ◽

Harmonic Generation ◽

Second Harmonic ◽

Laser System ◽

Average Output ◽

Periodically Poled ◽

Theoretical Simulation ◽

Periodically Poled Lithium Niobate ◽

532 Nm

We have experimentally demonstrated an efficient all-fiber passively Q-switched Yb-doped fiber laser with Samarium doped fiber as a saturable absorber. Average output power of 3.4 W at a repetition rate of 250 kHz and a pulse width of 1.1 microseconds was obtained at a pump power of 9.0 W. By using this fiber laser system and an MgO-doped congruent periodically poled lithium niobate (MgO:c-PPLN), second harmonic generation (SHG) output at 532 nm was achieved at room temperature. The conversion efficiency is around 4.2% which agrees well with the theoretical simulation.

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