Eyesafe laser system using transition metal-doped group II-VI semiconductor as a passive saturable absorber Q-switch

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United States of America Patent

PATENT NO 5832008
SERIAL NO

08790350

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An eyesafe laser system includes a Q-switch crystal formed of a semiconductor host material having noncentrosymmetric tetrahedral substitutional sites doped with transition metal ions in concentrations from about 0.001 to about 0.10 atomic percent, which functions as to be a saturable absorber of light at eyesafe wavelengths with a relatively long relaxation lifetime. Co.sup.2+ :ZnSe has been demonstrated to have advantageously high absorption cross section and advantageously high relaxation lifetime at both 1.54 .mu.m (Er:glass laser) and 1.6 .mu.m (Er:YAG laser). Other candidate host materials include other zinc chalcogenides, cadmium chalcogenides and zinc oxide. The resultant Q-switch does not require additional focusing optics inside the cavity and has a saturation fluence which is approximately one order of magnitude less than other state of the art saturable absorbers in the 'eyesafe' wavelength region, thereby permitting substantially faster Q-switch bleaching, lower thermal loads, and less potential for damage than was hitherto possible.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HUGHES ELECTRONICS CORPORATIONEL SEGUNDO, CA1768

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Birnbaum, Milton Rancho Palo Verdes, CA 10 91
Camargo, Marly B Sao Paulo, BR 4 49
Stultz, Robert D Bellflower, CA 32 177

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MASSACHUSETTS INSTITUTE OF TECHNOLOGY (1)
* 5394413 Passively Q-switched picosecond microlaser 73 1994
 
INTELLECTUAL VENTURES I LLC (1)
* 5388114 Miniaturized self-Q-switched frequency-doubled laser 20 1994
 
Allied-Signal Inc. (1)
* 4723248 Optical limiter 24 1985
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
MASSACHUSETTS INSTITUTE OF TECHNOLOGY (1)
6400495 Laser system including passively Q-switched laser and gain-switched laser 29 2000
 
THE UAB RESEARCH FOUNDATION (7)
* 6960486 Mid-IR microchip laser: ZnS:Cr2+ laser with saturable absorber material 6 2002
7548571 laser with saturable absorber material 3 2005
7606274 Mid-IR instrument for analyzing a gaseous sample and method for using the same 17 2006
* 2007/0064,748 Mid-IR laser instrument for analyzing a gaseous sample and method for using the same 7 2006
* 8817830 Saturable absorbers for Q-switching of middle infrared laser cavaties 1 2007
* 2008/0101,423 SATURABLE ABSORBERS FOR Q-SWITCHING OF MIDDLE INFRARED LASER CAVATIES 3 2007
* 9391424 Saturable absorbers for Q-switching of middle infrared laser cavaties 0 2014
 
BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INC. (2)
* 7203209 System and method for a passively Q-switched, resonantly pumped, erbium-doped crystalline laser 18 2005
* 2006/0159,132 System and method for a passively Q-switched, resonantly pumped, erbium-doped crystalline laser 4 2005
 
LUMENTUM OPERATIONS LLC (4)
* 6909730 Phase-locked loop control of passively Q-switched lasers 0 2003
* 2003/0179,785 Phase-locked loop control of passively Q-switched lasers 1 2003
7391794 Injection seeding of frequency-converted Q-switched laser 7 2005
* 2006/0268,950 Injection seeding of frequency-converted Q-switched laser 7 2005
 
PHARMALASE CORP (1)
* 2006/0007,965 Passive Q-switch modulated fiber laser 12 2004
* Cited By Examiner