Yusong R Yin

6356578, Mar 12, 2002

Dec 29, 1999

09/474589

Yusong Yin - Stony Brook NY

Photonics Industries International, Inc. - Bohemia NY

H01S 308

372107, 372108, 372 98, 372 27

According to the invention, a variable power laser beam delivery apparatus is provided. The apparatus includes a generator for delivering a preselected wavelength beam preferably an ultraviolet (UV) beam along a beam path. A dichroic mirror, desirably two (2) or more preferably four (4) dichroic mirrors, for transmitting the preselected UV wavelength beam at P-polarization and for highly reflecting the preselected UV wavelength beam at S-polarization are located along the preselected wavelength beam path delivered from the laser beam generator. A beam polarization rotator is mounted along the beam path of the laser beam provided from the laser beam generator. The beam polarization rotator is located between the laser beam generator and the dichroic mirror along the laser beam path. A beam output is provided by directing the beam transmitted by the dichroic mirror or reflected by the dichroic mirror to a preselected location as the output of the device. Alternatively when two beam outputs are desired, both the reflected and the transmitted beam can be used as laser beam outputs.

6366596, Apr 2, 2002

Jan 21, 2000

09/489123

Yusong Yin - Stonybrook NY
Peili Chen - Andover MA
Dmitry Donskoy - Oceanside NY

Photonics Industries International, Inc. - Bohemia NY

H01S 308

372 92, 372 99, 372 71, 372 35, 372 22, 372 93, 372 39

According to the invention, a high power diode pumped solid state laser is provided. The laser includes a first and second reflective surfaces which form an optical resonator cavity. A laser medium, particularly a Nd doped laser medium for example: a Nd:YAG, a Nd:YLF, or a Nd:YVO crystal is provided within the laser cavity. A fundamental frequency laser beam propagates from the front and back ends of the laser medium. The first reflective surface is highly reflective for fundamental beam. The second reflective surface is at least partially reflective for fundamental beam. The laser medium is end pumped by at least one diode pumping apparatus for example, a laser diode, or diode array, or fiber coupled laser diodes, whose wavelength matches at least one laser medium absorption band. The diode pumping apparatus is located adjacent either the front end or the back end of the laser medium, or both. The optical resonator cavity is configured to provide a laser beam diameter in the laser medium from about 0.

6584134, Jun 24, 2003

Dec 19, 2001

10/026510

Yusong Yin - Stonybrook NY
Peili Chen - Andover MA
Dmitry Donskoy - Oceanside NY

Photonics Industries International, Inc. - Bohemia NY

H01S 308

372 92, 372 93, 372 98, 372 22, 372 69, 372 75

According to the invention, a high power diode pumped solid state laser is provided. The laser includes a first and second reflective surfaces which form an optical resonator cavity. A laser medium, particularly a Nd doped laser medium for example: a Nd:YAG, a Nd:YLF, or a Nd:YVO crystal is provided within the laser cavity. A fundamental frequency laser beam propagates from the front and back ends of the laser medium. The first reflective surface is highly reflective for fundamental beam. The second reflective surface is at least partially reflective for fundamental beam. The laser medium is end pumped by at least one diode pumping apparatus for example, a laser diode, or diode array, or fiber coupled laser diodes, whose wavelength matches at least one laser medium absorption band. The diode pumping apparatus is located adjacent either the front end or the back end of the laser medium, or both. The optical resonator cavity is configured to provide a laser beam diameter in the laser medium from about 0.

6587487, Jul 1, 2003

Dec 19, 2000

09/741137

Yusong Yin - Bohemia NY

Photonics Industries International, Inc. - Bohemia NY

H01S 3102

372 22, 372 23, 372 98

Harmonic lasers are provided. A third harmonic laser includes a first high reflector and an output coupler forming a resonator cavity having an optical axis. The resonator cavity includes a laser medium for producing a fundamental beam. Desirably, the laser medium is Nd:YAG, Nd:YLF, Nd:YV04, although other laser mediums are also contemplated such as Ti:sapphire, Nd:YAB and the like. The laser medium can be pumped by any desired source for example laser, laser diode, laser diode bar, fiber coupled laser diode bar or lamp which are well known in the art. The laser medium can be either end pumped or side pumped which are also well known. The first high reflector is reflective of a fundamental beam. A second harmonic generator is located within the cavity formed between the first high reflector and the output coupler for generating a second harmonic beam from the fundamental beam. The output coupler is highly transmissive for second harmonic beam and partially transmissive for a fundamental beam.

6762405, Jul 13, 2004

May 30, 2003

10/448631

Xiaojie Zhao - Stonybrook NY
Shane Shizhou Zhang - Stonybrook NY
Alan Jinlin Xu - Bay Port NY
Yusong Yin - Stonybrook NY

Photonics Industries International, Inc. - Bohemia NY

H01J 4904

250288

A matrix assisted laser desorption and ionization system is provided. The system includes a mass spectrometer for analyzing at least one sample. The mass spectrometer includes a sample receiving chamber for receiving a sample under a vacuum. A UV laser is provided for producing a UV beam along a first beam path that does not intersect with the sample. A beam expander is provided in optical communication with the UV laser beam to expand the diameter of the beam. A focusing system is provided in optical communication with the beam expander to focus the laser beam propagating from the beam expander to a predetermined minimum spot size. The focusing system is located along the path of the beam propagating from the beam expander so that the beam strikes the approximate optical center of the focusing system. A high reflecting mirror is provided in optical communication with the focused beam propagating from the focusing system to direct the focused beam to strike the sample at a preselected strike point. Desirably, the laser, the beam expander and the focusing system, preferably a lens, are mounted to the same mounting surface or to parallel mounting surfaces that are joined together to form an integral structure.

6842293, Jan 11, 2005

Apr 13, 2002

10/122060

Yusong Yin - Bohemia NY, US
Xiaojie Zhao - Bohemia NY, US
Jing Zhao - Bohemia NY, US

G02B 2730

359641, 359726, 359729

A laser beam includes a concave or convex mirror which is reflective for wavelength of the high intensity beam. The reflective mirror is located along a preselected path of a high intensity laser beam so that the high intensity laser beam intersects the mirror at a first position. A beam collimator is located in the path of the high intensity beam reflected by the concave or convex mirror. The concave or convex mirror is movably mounted desirably rotatably mounted in the path of the high intensity beam. Desirably the mirror is rotated about a preselected axis. Desirably, the axis is selected so that when the mirror is rotated to a new position, the high intensity beam will be reflected along the same path to the collimator as it was prior to any rotation.

6961355, Nov 1, 2005

Jan 9, 2003

10/339241

Yusong Yin - Stonybrook NY, US
Xiaojie Zhao - Stonybrook NY, US
Jing Zhao - Centereach NY, US
Samuil Karlsbrun - Oakdale NY, US

Photonics Industries, Int'l. - Bohemia NY

H01S003/10

372 25, 372 26

Lasers are provided to deliver a wide variety of wavelengths at variable pulse energy. A laser cavity is formed between a first and second reflective surface. A lasing medium is located within cavity which lases at a preselected fundamental frequency. One or more nonlinear crystals are provided in optical communication with the lasing crystal to produce a secondary beam having a different frequency than the fundamental beam. A modulator is provided to control the pulse energy of the secondary beam. Desirably the secondary beam is a harmonic beam for example a second, third, fourth or fifth harmonic beam or a beam provided by an optical parametric oscillator.

6980574, Dec 27, 2005

Jul 18, 2003

10/623086

Yusong Yin - Stonybrook NY, US
Samuil Karlsbrun - Oakdale NY, US

Photonics Industries Int'l - Bohemia NY

H01S003/10

372 26, 372 25

According to the invention, a laser and a method of operating a laser which can produce multiple pulses from a single laser head is provided. A lasing medium is pumped by pumping source such as laser diodes, lamp and such. A modulator located in the cavity is turned on to induce a loss in the laser cavity sufficient to prevent lasing. A first predetermined amount of energy is stored in the lasing medium while the modulator is turned on due to a creation of a population inversion in the lasing medium in excess of the lasing threshold. The modulator is then turned off for a period of time to allow the lasing medium to provide a first pulse. The modulator is then turned on before the population inversion in the laser medium is depleted completely so that a predetermined amount of energy remains stored in the lasing medium. After the first pulse, the modulator again induces a loss in the cavity sufficient to prevent lasing. The modulator is maintained in the on position for a period of time to increase the amount of energy stored in the lasing medium.