High-power green laser development for an industrial applications
Figure 1 shows the basic structure of Ricoh's high-power diode pumped solid-state laser with small package volume. The structure utilizes key components and technologies for high power and compactness. (1) For compact pumping volume, a microchip laser and edge pumping are applied. (2) For the heating problem, composite laser crystal is applied. (3) For high-efficiency second harmonics generation, a bulk-type quasi-phase matching device is applied..
Figure 1: Basic structure of the high-power and small-package laser
Figure 2 shows our objective, the Tri Color Laser. This structure integrates the laser shown in Figure 1 for red, blue, and green.
Figure 2: Our objective, the Tri Color Laser
Figure 3 is a photograph of the green output of over 10W in CW operation. It is an experimental set-up utilizing microchip laser material and high-power pumping. Figure 4 is a photograph of the 150cm3 green laser unit with green power of 9.6W in CW operation.
Figure 3: Photograph of the green laser output
Figure 4: The 150cm3 green laser unit
A 1mm-thick bulk-type quasi-phase matching device with MgO:LiNbO 3 was developed using Ricoh's original method. Figure 5 shows a photograph of the quasi-phase matching device.
Figure 5: A bulk-type periodically poled MgO:LiNbO 3 device with 1-mm thickness