Yi Gan

Efficient green-light generation by proton-exchanged periodically poled MgO:LiNbO3 ridge waveguide.

Efficient cw 532 nm green-light generation is demonstrated using a periodically poled MgO:LiNbO3 ridge waveguide prepared by a process that combines annealed proton exchange and precise dicing. Performance of waveguides with different widths has been investigated. The 6-μm-wide, 1.6-cm-long uncoated ridge waveguide has achieved a green output power of 127 mW under a coupled fundamental light power of 250 mW. The highest conversion efficiency achieved is 53%.

Field-Sequential Operation of Laser Diode Pumped Nd : YVO

A compact modulated laser-diode pumped microchip green laser is presented based on optical-contact Nd : YVO4/periodically poled MgO : LiNbO3 (Nd : YVO4/PPMgLN) crystal. Linearly polarized green light of 450 mW was achieved with a maximum electrical-to-optical efficiency (EOE) of 16.25%. A peak power of 541.5 mW and an EOE of 13.9% was obtained when pumped by a peak current of 1.96 A. This green laser is designed for mobile laser display devices and has potential to be manufactured in mass production at low cost.

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— In this paper, a compact efficient diode-pumped solid-state (DPSS) green laser based on a periodically poled MgO:LiNbO3 (MgO:PPLN) crystal, which is suitable for low-cost mass production, was demonstrated. A linearly polarized 532-nm laser light of 1.02-W CW output power was obtained by employing a simple parallel-plane configuration. A numerical method, based on the 1 -D coupled-mode equations, is used in the cavity design and investigation of the intra-cavity second-harmonic-generation process.

/PPMgLN Microchip Green Laser

General time-domain traveling wave rate equations are employed for the simulation of the intra-cavity second harmonic generation (IC-SHG) of semiconductor lasers by a periodically poled nonlinear crystal waveguide. A 1060 nm high power, single-mode, ridge waveguide semiconductor laser is used in the simulation. The SHG crystal is a MgO-doped periodically poled lithium niobate with a single-mode ridge waveguide. Comparisons are made between the computed and experimental results of single-pass SHG for the purposes of model validation. The design of an IC-SHG green laser is further compared to the single-pass SHG laser in terms of the SHG output power, conversion efficiency, temperature tolerance, and high speed modulation capability. It is theoretically found that by using the IC-SHG configuration, SHG power and efficiency can be improved with a relatively short nonlinear crystal.

Watt‐level compact green laser for projection display

A novel watt-level compact green laser module (namely, mGreen), based on integrated Nd:YVO4 and MgO:PPLN crystals, is demonstrated for the first time. A linearly polarized 532-nm laser light of 1.28 W is obtained with an optical-to-optical conversion efficiency of 29.1%. The mGreen module is designed for green lasers with high power and low cost, which are in high demand in the laser display industry.

Theoretical Analysis of Intra-Cavity Second-Harmonic Generation of Semiconductor Lasers by a Periodically Poled Nonlinear Crystal Waveguide

A new compact green laser is demonstrated by using a mGreen module based on compact packaged MgO doped periodically poled lithium niobate (MgO:PPLN). The green laser can generate over 700-mW green light with an opticalto- optical efficiency of 29.6% and a volume of less than 7 cm3. The excellent performances of the MgO:PPLN based lasers, including high efficiency, compact size, low cost and being suitable to mass production, are very attractive for laser display applications.

Compact Integrated Green Laser Module for Watt-Level Display Applications

In this paper, we report a novel LiNbO3 ridge waveguide fabrication technique based on the combination of Annealed Proton-Exchanging (APE) and precise diamond blade dicing. The process is ultra compact and compatible with periodically polled LiNbO3 (PPLN). By selecting optimized fabrication conditions, ridge waveguide with low propagation loss and single transmission mode can be formed at 1064nm and 1500nm wavelength, respectively. Such APE ridge waveguides have potential applications in optical communication, biomedical detection, and especially in nonlinear wavelength conversion.

MgO:PPLN based green lasers for portable laser projectors

In this paper, characteristics of the intra-cavity frequency doubled Nd:YYO4/PPMgO:LN green laser have been studied experimentally and theoretically. Two types of green laser strucutures, namely optical contact structure and separated structure, have been packaged for low power (100 mW) and high power (~1 W) applications, respectively. Coupled mode equations are used to investigate the green laser. The effect of the thermal dephasing along the propagation direction in the PPMgO:LN due to the heat generation by the linear absorption of the fundamental wave and linear and nonlinear absorption of the second hamonic (SH) wave is analyzed theoretically. By introducing the longitudinal temperature chirp in the PPMgO:LN crystal, the temperature tuning curve is enlarged by using a uniform PPMgO:LN grating.

Annealed proton-exchanged LiNbO3 ridge waveguide for photonics application

In this paper we report a modulated laser-diode pumped microchip green laser based on optical-contact Nd:YVO4/periodically poled MgO:LiNbO3 (Nd:YVO4/PPMgLN) crystal. A linearly polarized green light peak power as high as 541.5 mW was obtained for the first time, which corresponds to an electrical-to-optical efficiency of 13.9%. The maximum electrical-to-optical efficiency was 16.25%.

Experimental and theoretical characterization of Nd:YVO4/PPMgO:LN green lasers

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.