1. Bahram Jalali

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    1. Mentioned In 7 Articles

    2. Fourier-domain mode-locked laser combined with a master-oscillator power amplifier architecture

      Fourier-domain mode-locked laser combined with a master-oscillator power amplifier architecture
      Originally introduced in 2005 for high-speed optical coherence tomography, the rapidly wavelength-swept Fourier-domain mode-locked (FDML) laser still, to this day, enables highest imaging speeds through a very high-speed spectral tuning capability. The FDML laser achieves a tuning bandwidth of over 1/10th of its center wavelength and can sweep this entire bandwidth in less than a microsecond. Interestingly, even though it covers a very broad spectral range, instantaneously it has ...
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      Mentions: Bahram Jalali UCLA
    3. Dispersive Fourier transformation for fast continuous single-shot measurements

      Dispersive Fourier transformation for fast continuous single-shot measurements
      Dispersive Fourier transformation is an emerging measurement technique that overcomes the speed limitations of traditional optical instruments and enables fast continuous single-shot measurements in optical sensing, spectroscopy and imaging. Using chromatic dispersion, dispersive Fourier transformation maps the spectrum of an optical pulse to a temporal waveform whose intensity mimics the spectrum, thus allowing a single-pixel photodetector to capture the spectrum at a scan rate significantly beyond what is possible with ...
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    4. Feature Of The Week 9/30/12: UCLA Researchers Demonstrate High Throughput OCT Operating at Record Axial Scan Rate of Nearly 100 MHz in the 800 nm Spectral Range

      Feature Of The Week 9/30/12: UCLA Researchers Demonstrate High Throughput OCT Operating at Record Axial Scan Rate of Nearly 100 MHz in the 800 nm Spectral Range
      ... of view or a large number of parts in a short period of time. A group of researchers led by Keisuke Goda and Bahram Jalali at UCLA recently proposed and demonstrated high-throughput OCT that offers 1,000 times higher ax...
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    5. High-throughput optical coherence tomography at 800 nm

      High-throughput optical coherence tomography at 800 nm
      We report high-throughput optical coherence tomography (OCT) that offers 1,000 times higher axial scan rate than conventional OCT in the 800 nm spectral range. This is made possible by employing photonic time-stretch for chirping a pulse train and transforming it into a passive swept source. We demonstrate a record high axial scan rate of 90.9 MHz. To show the utility of our method, we also demonstrate real-time observation ...
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    6. Real-time optical reflectometry enabled by amplified dispersive Fourier transformation

      Real-time optical reflectometry enabled by amplified dispersive Fourier transformation
      The axial scan rate of optical frequency-domain reflectometry and optical coherence tomography can be increased to megahertz frequencies by dispersive Fourier transformation. However, the fundamental connection between dispersion and loss creates a trade-off between detection sensitivity and acquisition speed. Here we circumvent this predicament by using distributed Raman postamplification of the reflection from the sample. The Raman amplification enables measurement of weak signals, which are otherwise buried in detector noise ...
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  2. About Bahram Jalali

    Bahram Jalali

    Bahram Jalali runs the Optoelectronics Circuits and Systems Laboratory at UCLA performs multi-disciplinary research and development in the fields of communication and sensing. The Lab has two complementary missions. The first is to solve critical problems faced by Defense and Commercial industries through innovative approaches thatenable revolutionary advances in devices or systems. The second and equally important mission is to produce creative and highly skilled engineers who will be the driving force for technological innovation in the 21st century. The Lab enjoys the strong support of the US Defense Department and private companies.