Coherent light generators – Particular beam control device – Mode locking
Patent
1989-02-28
1990-06-12
Sikes, William L.
Coherent light generators
Particular beam control device
Mode locking
372 22, 307425, 307426, 307427, H01S 3098, H03F 700
Patent
active
049339443
ABSTRACT:
The disclosure is directed to two embodiments for passive and one embodiment for active mode locking of lasers. The passive systems comprise a GaAs/GaAlAs diode laser (810 nm) pumped Nd:YAG (1064 nm) laser sharing the same optical cavity. A KTP crystal is used to produce a sum of the frequencies of the diode and Nd:YAG laser (460 nm). The KTP crystal and trichroic mirror (with a reflectivity at 810 nm less than the reflectivity at the other two wavelengths) combine to create an effective end mirror reflectivity which increases in accordance with the intensity of the pump laser wavelength (810 nm) to mode lock the system. The active embodiment uses successive sum and difference frequency generation to modulate the reflectivity of a cavity output coupling mirror in a continuous wave dye laser or external cavity diode laser. A KTP crystal is used to sum the frequencies of the 810 nm dye laser and injected pulses from a Nd:YAG (1064 nm) laser which mode lock the dye laser by periodically increasing the reflectivity of its output coupling mirror, the reflectivity of which is responsive to the intensity of light thereon.
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Epps Georgia Y.
Peacock Deborah A.
Sikes William L.
University of New Mexico
Weig Robert W.
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