Laser displays require red, green and blue (RGB) laser sources each with a low-cost, a high wall-plug efficiency, and a
small size. However, semiconductor chips that directly emit green light with sufficient power and efficiency are not
currently available on the market. A practical solution to the "green" bottleneck is to employ diode pumped solid state
laser (DPSSL) technology, in which a frequency doubling crystal is used. In this paper, recent progress of MgO doped
periodically poled lithium niobate (MgO:PPLN) frequency doubling optical chips will be presented. It is shown that
MgO:PPLN can satisfy all of the requirements for laser displays and is ready for mass production.
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 cm<sup>3</sup>. 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.
Periodically poled lithium niobate (PPLN) waveguide based green lasers have attracted much attention in the past years
due to their excellent properties, such as high efficiency and small size. The potential application fields include laser
display, bio-instrumentation, undersea communication and so on. In this paper, recent progresses on the development of
PPLN waveguide based green lasers are introduced and reviewed.
In this paper, characteristics of the intra-cavity frequency doubled Nd:YYO<sub>4</sub>/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
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 LiNbO<sub>3</sub> (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.
We present design, fabrication and characterization of a novel integrated device for tuning the wavelength of quasi-phase
matched (QPM) second harmonic generation (SHG) in a periodically poled lithium niobate (PPLN) wavelength
converter. A Cr/Pt/Au thin film layer is deposited on a PPLN device with a polymer buffer layer to work as a micro-heater.
Wavelength tuning is achieved by applying current to the micro-heater, which changes the effective period of
QPM grating and thus the QPM wavelength through the thermal optics effect (TOE). In contrast to the conventional
temperature tuning method based on a bulky oven, the proposed device has excellent characteristics such as compact,
fast tuning speed and low power consumption.