Brian H. Kolner

Brian H. Kolner

Professor

Phone:
(530) 754-4370
Email:

Professional Experience

  • 1955, B.S. Electrical Eng., University of Wisconsin, Madison
  • 1979, M.S. Elect. Eng., Stanford University
  • 1981, Ph.D. Elect. Eng., Stanford University, 1985
  • Member of the Technical Staff, Hewlett-Packard Laboratories (1985-1991)
  • Associate Professor, Electrical Engineering, UCLA (1991-1996)
  • Professor, Applied Science and Electrical and Computer Engineering, University of California, Davis (1996-present)

Research Interests

  1. Space-time analogies in electromagnetics: There is an intriguing analogy between the equations that describe the natural diffraction of electromagnetic wave in space and the spreading or dispersion of electromagnetic pulses in dielectrics. The mathematical analogy between these equations has led our group to develop the time domain analog of spatial lenses. These so-called "time lenses" allow us to manipulate optical waveforms in the time domain in much the same way that spatial imaging with conventional lenses is performed. For example, we have recently demonstrated a time microscope which can expand optical pulse trains by a factor of 100 which makes subpicosecond phenomena observable on a commercial high-speed oscilloscope. This technique may someday find applications in pushing the data rate of high speed fiber optic elecommunications systems.
  2. Terahertz spectroscopy: Far above the frequency range of microwave signals is a portion of the spectrum where electromagnetic waves interact with complex molecules. This region, from roughly 100 Ghz to 100 THz, is difficult to access with conventional technology but recent advances using femtosecond light pulses has made it available for study in the laboratory and even on a small commercial scale. Briefly, intense femtosecond light pulses in the visible portion of the spectrum are focused into crystals, which react strongly with the intense optical field and reradiate pulses in the terahertz region with equally short duration and hence very large bandwidths. In effect, the process instantaneously covers a large portion of the spectrum in a very short electromagnetic pulse. We are creating systems to generate and detect these pulses and use them to study the interaction of the radiation with various materials. Generically, this is called spectroscopy and we are interested in the vast region of frequencies between microwaves and the near infrared.
  3. Lasers as clocks: Modern femtosecond pulsed lasers have demonstrated extraordinary stability in the repetition rate of the pulse train. These lasers typically generate pulses of 20 femtoseconds at rates around 100 MHz. If the repetition rate were absolutely constant, these lasers could act as clocks by turning the optical pulses into electrical pulses with phodetectors. However, like any real oscillator (electrical, mechanical, optical, atomic), the repetition rate fluctuates and this deviation from the ideal is known as "phase noise." We have assembled a system for studying the phase noise of femtosecond lasers that is quite possibly the best in the world in the sense that it can detect the most minute fluctuations in the timing stability right down to the quantum limit. We have recently used this system to characterize the stability of several optical and electronic oscillators and have found that our femtosecond lasers have remarkably low phase noise, even rivaling the best electronic oscillators. This suggests that femtosecond lasers, with further development, might make practical alternatives to quartz electronic oscillators for special applications in frequency and time keeping metrology.

Selected Publications

R. P. Scott, W. Cong, C. Yang, V. J. Hernandez, J. P. Heritage, B. H. Kolner, and S. J. B. Yoo, "Error-free, 12-user, 10-Gb/s/user O-CDMA network testbed without FEC," IEE Electronics Letters, vol. 41, pp. 1392-1394, 2005. The paper is available as a PDF file here (~125 KB).

R. P. Scott, W. Cong, V. J. Hernandez, K. Li, B. H. Kolner, J. P. Heritage, and S. J. B. Yoo, "An Eight-User, Time-Slotted SPECTS O-CDMA Testbed: Demonstration and Simulations," IEEE Journal of Lightwave Technology, vol. 23, pp. 3232-3240, 2005. The paper is available as a PDF file here (~990 KB).

B. H. Kolner, P. M. Conklin, R. A. Buckles, N. K. Fontaine, and R. P. Scott, "Time-resolved pulsed-plasma characterization using broadband terahertz pulses correlated with fluorescence imaging," Applied Physics Letters, vol. 87, pp. 151501, 2005. The paper is available as a PDF file here (~260 KB).

V. J. Hernandez, Y. Du, W. Cong, R. P. Scott, K. Li, J. P. Heritage, Z. Ding, B. H. Kolner, and S. J. B. Yoo, "Spectral Phase-Encoded Time-Spreading (SPECTS) Optical Code-Division Multiple Access for Terabit Optical Access Networks," IEEE Journal of Lightwave Technology, vol. 22, no. 11, pp. 2671-2679, November 2004. The paper is available as a PDF file here (~855 KB).

W. Cong, R. P. Scott, V. J. Hernandezs, K. Li, J. P. Heritage, B. H. Kolner, and S. J. B. Yoo, "High performance 70 Gbit/s SPECTS optical-CDMA network testbed," IEE Electronics Letters, vol. 40, no. 22, pp. 1439-1440, October 2004. The paper is available as a PDF file here (~228 KB).

R. P. Scott, W. Cong, K. Li, V. J. Hernandez, B. H. Kolner, J. P. Heritage, and S. J. B. Yoo, "Demonstration of an Error-Free 4 X 10 Gb/s Muiltiuser SPECTS O-CDMA Network Testbed," IEEE Photonics Technology Letters, vol. 16, No.9, pp. 2186-2188, September 2004. The paper is available as a PDF file here (~252 KB).

R. P. Scott, C. Langrock, and B. H. Kolner, "High-Dynamic-Range Laser Amplitude and Phase Noise Measurement Techniques," Invited Paper. IEEE J. Sel. Topics in Quant. Electron., vol. 7, no. 4, pp. 641-655, July/August 2001. The abstract is available in HTML. The paper is available as a PDF file here (~800 KB).

A. M. Shaw, R. N. Zare, C. V. Bennett, and B. H. Kolner, "Bounce-by-Bounce Cavity Ring-Down Spectroscopy: Femtosecond Temporal Imaging, " CHEMPHYSCHEM , vol. 2, no. 2, pp. 118-121, February 2001. The paper is available as a PDF file here (~116 KB).
C. V. Bennett and B. H. Kolner, "Aberrations in Temporal Imaging," IEEE J. Quant. Electron., vol. 37, no. 1, pp. 20-32, January 2001. The abstract is available in HTML. The paper is available as a PDF file here (~496 KB).

C. V. Bennett and B. H. Kolner, "Principles of Parametric Temporal Imaging-Part II: System Performance," IEEE J. Quant. Electron., vol. 36, no. 6, pp. 649-655, June 2000. The abstract is available in HTML. The paper is available as a PDF file here (~230 KB).

C. V. Bennett, B. H. Kolner, "Principles of Parametric Temporal Imaging-Part I: System Configurations," IEEE J. Quant. Electron., vol. 36, no. 4, pp. 430-437, April 2000. The abstract is available in HTML. The paper is available as a PDF file here (~280 KB).

C. V. Bennett and B. H. Kolner, "Upconversion time microscope demonstrates 103X magnification of femtosecond waveforms," Optics Letters, vol. 24, no. 11, pp. 783-785, June 1999. The abstract is available in HTML. The paper is available as a PDF file here (~375 KB).

B. H. Kolner, "Pinhole time camera," J. Opt. Soc. Am. A, vol. 14, no. 12, pp. 3349-3357, Dec. 1997. The abstract is available in HTML.

R. P. Scott, C. V. Bennett, and B. H. Kolner, "AM and high harmonic FM laser mode locking," Applied Optics, vol. 36, no. 24, pp. 5908-5912, Aug. 1997. Click here for the abstract. The paper is available as a PDF file here (~273 KB).

B. H. Kolner, "Generalization of the concepts of focal length and f-number to space and time," J. Opt. Soc. Am. A, vol. 11, no. 12, pp. 3229-3234, Dec. 1994. The abstract is available in HTML.

C. V. Bennett, R. P. Scott, and B. H. Kolner, "Temporal magnification and reversal of 100 Gb/s optical data with an up-conversion time microscope," Applied Physics Letters, vol. 65, no. 20, pp. 2513-2515, Nov. 1994. The abstract is available in HTML. The paper is available as a PDF file here (~75 KB).

B. H. Kolner, "Space-time duality and the theory of temporal imaging," IEEE J. Quant. Electron., vol. 30, no. 8, pp. 1951-1963, Aug. 1994. The abstract is available in HTML. The paper is available as a PDF file here (~1.1 MB).

B. H. Kolner and M. Nazarathy, "Temporal imaging with a time lens," Optics Letters, vol. 14, pp. 630-632, 1989, and erratum vol. 15, p. 655, 1990. The abstract is available in HTML.

B. H. Kolner, "Active pulse compression using an integrated electro-optic phase modulator," Applied Physics Letters, vol. 52, no. 14, pp. 1122-1124, 1988. The abstract is available in HTML.