Overview
Nonlinear optical wavelength conversion techniques must be used
to obtain continuous coherent light in the deep-ultraviolet region.
We have invented a novel technique that drastically improves the
efficiency of wavelength conversion, and have already demonstrated
generation of continuous coherent light with a power output of
6 watts (the world highest) at a wavelength of 257 nm, using an
argon ion laser. This high power is sufficient for application in
lithography and material processing as well as analysis and
measurement.
Continuous coherent deep-UV generator
We are also developing technology that allows long-term stable operation,
and are making prototypes that use semiconductor diode lasers, which
consume less electric power.
Generation of the fourth harmonic of a YAG laser
in an external optical resonator
It is very important how to obtain the desired alignment of liquid
crystal molecules in LCD. Generally, this is achieved by physical
treatment of organic film coated on the glass substrate. We have
succeeded in obtaining same effect only by optical treatment using
this high power coherent UV light. This light source is also
useful for various processing in LCDs.
 Publications
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