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Blue Light Source Based on Resonant Enhancement of Interactivity Sum Frequency Mixing

IP.com Disclosure Number: IPCOM000111113D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Length, W: AUTHOR [+2]

Abstract

This invention describes a method for enhancing the efficiency of Type-H sum-frequency generation of blue light. Blue light at 459 nm can be produced by mixing 1064 nm and 809 nm light in the nonlinear material KTP. A novel design permits the KTP crystal to be placed simultaneously within the cavity of a diode-pumped Nd:YAG laser and within a passive resonator designed to build up the intensity of a GaAlAs diode laser. This arrangement provides high intensity for both the 1064 nm and 809 nm signals required in the mixing process, leading to efficient production of 459 nm radiation. Instead of resonating the 809 nm light, it is also possible to increase the efficiency by resonating the 459 nm light.

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Blue Light Source Based on Resonant Enhancement of Interactivity
Sum Frequency Mixing

      This invention describes a method for enhancing the efficiency
of Type-H sum-frequency generation of blue light.  Blue light at 459
nm can be produced by mixing 1064 nm and 809 nm light in the
nonlinear material KTP.  A novel design permits the KTP crystal to be
placed simultaneously within the cavity of a diode-pumped Nd:YAG
laser and within a passive resonator designed to build up the
intensity of a GaAlAs diode laser.  This arrangement provides high
intensity for both the 1064 nm and 809 nm signals required in the
mixing process, leading to efficient production of 459 nm radiation.
Instead of resonating the 809 nm light, it is also possible to
increase the efficiency by resonating the 459 nm light.

      It is not possible to simply make the Nd:YAG laser cavity a
passive resonator for the 809 nm light, because the Nd:YAG crystal
absorbs this wavelength, and this would lead to a very lossy
resonator.  To avoid this problem, the invention uses two resonators
having a common section containing the KTP crystal (Fig. 1), but with
the Nd:YAG crystal contained only in the active resonator of the 1064
nm laser.  One embodiment, shown in Fig. 1, uses a dichroic beam
splitter to "fold" one of the resonators so that it overlaps the
other in the region of the KTP crystal.  In another embodiment (Fig.
2), the KTP crystal is shaped as a prism so that the 1064 nm and 459
nm beam c...