Masayuki Momiuchi

Evaluation of composite laser crystals by output distribution on the crystal facets

We have established the evaluation technique for composite crystals by measuring the output-power distribution that depends on pumping light-source position over the crystal facet. This evaluation has contributed to improvement for yield of laser modules.

New concept of a CW coaxial fi've-wavelength DPSSL

We have demonstrated the compact and efficient watt-class CW coaxial five-wavelength DPSSL (532 nm, 593 nm, 671 nm, 1064 nm and 1342 nm) by use of Nd:YVO4 dual cavities and KTP crystals. Five wavelengths were switched by shifting of KTP crystals and output couplers.

New design of a CW coaxial five-color DPSSL

In this paper, we have demonstrated the compact and efficient watt-class cw coaxial five-color DPSSL (1342 nm, 1064 nm, 671 nm, 593 nm, 532 nm). Expanding this idea, we can select the optimum wavelength for tissue treatments at CW or QCW in a wide spectra range from visible to infra-red, without changing cavities or delivery fibers. We hThis laser shows we can select the optimum wavelength for tissue treatments at CW or QCW in a wide spectra range from visible to infra-red.

Development of the diode pumped 1 W solid state orange laser by dual pumping dual cavity

We have developed diode pumped solid state orange (593 nm) laser by use of intracavity sum frequency mixing for Nd:YVO/sub 4/ dual pumping dual cavity (1342 nm and 1064 nm). The maximum orange power was 1.29 W at 30 W pumping.

Diode-pumped solid state green laser for ophthalmologic application

We have developed diode pumped solid state green laser suitable for ophthalmologic applications. Beam parameters were designed by considering the coagulation system. We have lowered the beam quality to multi transverse and longitudinal mode on purpose to improve the speckle noise of the slit lamp output beam. The beam profile shows homogeneous intensity and it is very useful for ophthalmologic application. End pumping and short cavity configuration made it possible.

[Sclerostomy with an erbium YAG laser--the relationship with pulse energy].

Purpose: To investigate the optimal pulse energy to do sclerostomy with an erbium YAG laser.Materials and Methods: The experiments were performed in enucleated porcine eyes. We changed pulse energy and examined the effects on surrounding tissue.Results: With the increase of pulse energy, the effects of the laser extended to the area surrounding the laser probe. At the threshold energy for doing full-thickness sclerostomy, the total energy was significantly higher than with higher pulse energy. And with pulse energy higher than 2 mJ, the total energy did not show any significant change. Histopathologically, the damaged area around sclerostomy became larger with the increase of pulse energy.Conclusion: The optimal energy to do full-thickness sclerostomy with this system seemed to be 2 mJ.

Development of highly efficient green lasers for surveying systems

1. R. W. Waynant, P. H. Klein, Appl. Phys. Lett. 46, 14 (1985). 2. M. A. Dubinskii, A. C. Cefalas, E. Sarantopoulou, S. M. Spyrou, C. A. Nicolaides, R. Yu. Abdulsabirov, S. L. Korableva, V. V. Semashko, J. Opt. Soc. Am. B9, 1148 (1992). J. Thogersen, J. D. Gill, H. K. Haugen, Opt. Commun. 132,83 (1996). Such an excitation scheme has been previously employed [see S. A. Payne, G. D. Wilke, J. Luminescence 50, 159 (1991)], but no fluorescence spectrum was published. 3.