A Model For The Nearly Single Lobed Far-Field In A Diode Array Traveling-Wave Amplifier

John R Andrews; T L Paoli; R D Burnham

doi:10.1117/12.944352

9 August 1988 A Model For The Nearly Single Lobed Far-Field In A Diode Array Traveling-Wave Amplifier

John R Andrews, T L Paoli, R D Burnham

Proceedings Volume 0893, High Power Laser Diodes and Applications; (1988) https://doi.org/10.1117/12.944352
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

A model is presented to explain some of the optical properties of traveling-wave amplifiers made from gain-guided diode laser arrays. The model describes the amplifier as a complex volume diffraction grating with the grating period being the array period. The volume grating has an aperture limited by the width of the array. Experimental measurements of' the far-field pattern and the diffraction efficiency into the side-lobes as a function of the incident angle of the injected signal are compared to calculations based on the model. Good fits are obtained to both sets of experimental data with only gain and refractive index modulation as parameters. New data are presented for the diffraction efficiency of the volume grating as a function of the current to the amplifier. These data are fit to this same model using the same parameters and assuming that the gain and index modulation at each current are proportional to the measured gain at the same current less the value of the gain at zero current. The implications of this model to amplifiers and lasers will be discussed.

Citation Download Citation

John R Andrews, T L Paoli, and R D Burnham "A Model For The Nearly Single Lobed Far-Field In A Diode Array Traveling-Wave Amplifier", Proc. SPIE 0893, High Power Laser Diodes and Applications, (9 August 1988); https://doi.org/10.1117/12.944352

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