M M Fejer - Storming Media

Micro-Structured Materials for Generation of Coherent Light and Optical Signal Processing

22 Dec 2008

35 pages

Authors: M M Fejer; R K Route; M Charbonneau-Lefort; J Huang; D Hum; P Kuo; C Langrock; STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS

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Our research interests focus on improving nonlinear optical materials, developing microstructuring techniques to access new wavelength regions and new applications, and fabricating devices for high-power visible generation, ultra-fast optical interactions, mid-IR generation, and optical signal processing. This program has continued the development of microstructured nonlinear optical materials and quasi-phase-matched devices based on those materials. The material systems investigated, periodically-poled ferroelectrics, especially lithium niobate (PPLN) and lithium tantalate (PPLT), and orientation-patterned ...

Growth of MM-Thick Orientation-Patterned GaAs for IR and THZ Generation

30-Aug-2008

8 pages

Authors: C Lynch; D F Bliss; T Zens; A Lin; J S Harris; P S Kuo; M M Fejer; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE/ELECTROMAGNETICS TECHNOLOGY DIV

Low-pressure hydride vapor phase epitaxy (HVPE) is being used for the regrowth of thick GaAs on orientation-patterned templates for nonlinear optical frequency conversion. We have achieved epitaxial growth rates of 200um/h and produced millimeter-thick films in 10-h-long growth runs. A critical problem in the HVPE regrowth of orientation-patterned GaAs is the preservation of the original patterned structure - during thick growth, the domain walls often bend and annihilate. Measurements indicated ...

GaAs Optical Parametric Oscillator With Circularly Polarized ad Depolarized Pump

15 Sep 2007

4 pages

Authors: David Bliss; David Weyburne; P S Kuo; K L Vodopyanov; M M Fejer; X Yu; J S Harris; AIR FORCE RESEARCH LAB HANSCOM AFB MA OPTOELECTRONIC TECHNOLOGY BRANCH

We demonstrate an optical parametric oscillator (OPO) based on GaAs pumped with linearly polarized and circularly polarized light and show that the relative OPO thresholds agree with theoretical expectations. For the circularly polarized pump, the threshold was as low as for the [111]-linearly polarized pump case. The pump was also passed through a Lyot depolarizer to produce pseudo-depolarized light, and the OPO threshold in this case was only 22% higher ...

06 Aug 2007

7 pages

Authors: Qiang Zhang; Xiuping Xie; Hiroki Takesue; Sae-Woo Nam; Carsten Langrock; M M Fejer; Yoshihisa Yamamoto; STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS

We report 10-ps correlated photon pair generation in periodically-poled reverse-proton-exchange lithium niobate waveguides with integrated mode demultiplexer at a wavelength of 1.5 micrometers and a clock of 10 GHz. Using superconducting single photon detectors, we observed a coincidence to accidental count ratio (CAR) as high as 4000. The developed photon-pair source may find broad application in quantum information systems as well as quantum entanglement experiments.

31-Jul-2007

7 pages

Authors: Yoshihisa Yamamoto; Qiang Zhang; M M Fejer; Xiuping Xie; Hiroki Takesue; Sae W Nam; Carsten Langrock; STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS

We report 10-ps correlated photon pair generation in periodically-poled reverse-proton-exchange lithium niobate waveguides with integrated mode demultiplexer at a wavelength of 1.5-micron and a clock of 10 GHz. Using superconducting single photon detectors, we observed a coincidence to accidental count ratio (CAR) as high as 4000. The developed photon-pair source may find broad application in quantum information systems as well as quantum entanglement experiments.

High-Power Source of THz Radiation Based on Orientation-Patterned GaAs Pumped by a Fiber Laser

15-May-2006

7 pages

Authors: David Bliss; Candace Lynch; G Imeshev; M E Fermann; K L Vodopyanov; M M Fejer; X Yu; J S Harris; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE

We demonstrate a new source of frequency-tunable THz wave packets based on parametric down-conversion process in orientation-patterned GaAs (OP-GaAs) that produces microW-level THz average powers at the repetition rate of 100 MHz. The OP-GaAs crystal is pumped by a compact all-fiber femtosecond laser operating at the wavelength of 2 microns. Such combination of fiber laser and OP-GaAs technologies promises a practical source of THz radiation which should be suitable for ...