Coherent beam addition of GaAlAs lasers by binary phase gratings

Leger, James R.; Swanson, Gary J.; Veldkamp, Wilfrid B.
April 1986
Applied Physics Letters;4/7/1986, Vol. 48 Issue 14, p888
Academic Journal
A general technique for combining laser beams coherently using binary gratings has been developed. Experiments were performed with lasers from a monolithic linear GaAlAs array. The grating transmittance profile was designed to convert the light beams from the array into a single beam with high efficiency. Optical feedback through the grating locked the lasers together in proper relative phase. The far-field diffraction pattern of the sum was practically identical in shape to that of a single laser. Coupling efficiencies greater than 80% appear to be feasible with this technique. The method is applicable to a variety of laser systems (gas, solid state, etc.) and is readily extendable to a two-dimensional array of lasers.


Related Articles

  • Laser beam goes to new lengths.  // R&D Magazine;Mar96, Vol. 38 Issue 4, p11 

    Reports that the Center for Ultrafast Optical Science at the University of Michigan, has produced a 20-m-long low-energy beam of laser light. Aims of laser beam.

  • Proposed international standard for laser-beam quality falls short. Lawrence, George N. // Laser Focus World;Jul94, Vol. 30 Issue 7, p109 

    Discusses the limitations of the International Organization for Standardization's (ISO) beam propagation factor (M2) as a standard of laser beam quality. How the M2 method works; Sensitivity of the second moment to widely scattered light; Difference in values at higher spatial frequencies. ...

  • Seeing is believing with visual laser-beam diagnostics. Roundy, Carlos B. // Laser Focus World;Jul94, Vol. 30 Issue 7, p117 

    Focuses on the real-time visualization of laser beam profiles. Solid-state matrix detector array cameras and computer processing; Linear arrays of silicon or pyroelectric detectors and devices; Computerized technology for displaying beam profiles from two-dimensional array cameras.

  • Dispersion-compensating fiber transmits sub-100-femtosecond pulses.  // Laser Focus World;Sep96, Vol. 32 Issue 9, p13 

    Reports that researchers from West Lafayette, Indiana-based Purdue University and Murray Hill, New Jersey-based Lucent Technologies concatenated positive-dispersion-slope single-mode fiber with negative-dispersion-slope dispersion-compensating fiber (DCF) to transmit recompressed laser pulses. ...

  • Diode-pumped laser amplifiers increase 2-micronm output energy by an order of magnitude.  // Laser Focus World;Feb97, Vol. 33 Issue 2, p9 

    Reports that researchers at the Remote Sensing Technology Branch of the US National Aeronautics and Space Administration (NASA) Langley Research Center in Hampton, Virginia have produced a 700-mJ, 400-ns-long pulses from an amplified flashlamp-pumped Ho, Tm, Er;YLF Q-switched oscillator. Design...

  • Laser induces nonphotochemical nucleation in supersaturated urea solution.  // Laser Focus World;Feb97, Vol. 33 Issue 2, p11 

    Reports that Bruce Garetz and colleagues at Polytechnic University in Brooklyn, New York City have observed that the electric field of a plane-polarized laser beam induces crystallization in a supersaturated aqueous solution of urea. Crystallization as a new photophysical phenomenon related to...

  • Tissue produces harmonics with ultrashort pulses. Peach, Laurie Ann // Laser Focus World;Feb97, Vol. 33 Issue 2, p46 

    Reports that researchers in the United States have generated second- and third-harmonic signals of femtosecond and picosecond laser pulses. Conversion efficiencies; Potential for using light as a noninvasive diagnostic and therapeutic tool for biomedical applications such as detecting...

  • Liquid crystals measure light intensity. Tabiryan, Nelson V. // Laser Focus World;Apr98, Vol. 34 Issue 4, p165 

    Deals with the principles of laser beam measurement and characterization. Nonlinear optical measurements; Control of optical axis of liquid crystals; Induced nonlinearity gauge; Bream reconstruction and interpolation of electromagnetic fields with induced nonlinearity gauge technique.

  • Education key to safe use of laser pointers. Hejlik, Karl // Laser Focus World;Sep98, Vol. 34 Issue 9, p63 

    Discusses the importance of education for the safe use of laser pointers. Government policy of the United States and Great Britain regarding laser pointers; Secondary hazards of the device; Laser pointer tips.

  • Plasma guides high-energy laser pulses. Carts, Yvonne A. // Laser Focus World;Jan94, Vol. 30 Issue 1, p33 

    Presents information on two approaches which are being developed by researchers, Charles Durfee III and Howard M. Milchberg, to keep high-energy laser beams collimated. Demonstration of optical guiding of intense laser pulses over a range 24 times longer than the laser's Rayleigh length.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics