Durip 94 Phase Conjugate Injection Locking Of Laser Diode Arrays
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DURIP-94: Phase Conjugate Injection Locking of Laser Diode Arrays
This is an 'equipment only' grant under the Defense University Research Instrumentation Program. A report of the results obtained with this equipment is contained in the final report for Grant F49620-95-1-0082, 'Phase-Conjugate Injection Locking of Laser Diode Arrays.' To avoid duplication of paperwork, only a partial summary of that report will be duplicated here. This grant is to produce high-brightness, narrow-frequency light beams from semiconductor laser arrays using optical phase conjugation. The investigators recently demonstrated that their proposed techniques are both practical and efficient, and can be applied to commercially available semiconductor lasers. Their experiments coupled an optical phase conjugator to a broad-area semiconductor laser, causing the laser to emit a 0.5 watt, near-diffraction-limited output beam. Their system is simple and compact, and it also automatically adjusts for any frequency drift or gradual misalignment of the optical components. The investigators extended their techniques from single, broad-area lasers to powerful semiconductor laser arrays.
Phase Conjugate Injection Locking of Laser Diode Arrays
This goal of this project is to produce a high-brightness, narrow-frequency light beam from a semiconductor laser array. We used a mutually-pumped phase conjugator to couple a single-frequency master laser into a high-power diode laser array. This injected light narrowed the frequency bandwidth of the laser array's output beam. Tuning the master laser (by adjusting its current or its temperature) then smoothly tuned the laser array, while the output beam remained diffraction limited. We compared the performance of the four types of mutually-pumped phase conjugators for injecting light into a laser array. We also invented a new technique for detecting domains hidden in photorefractive crystals. We also measured the phase of the light produced by frequency doubling in a self-phase matched optical fiber. We also measured the anisotropy of the mobility of holes in barium titanate crystals. We found that the drift mobility perpendicular to the crystal's c-axis is 40 times that along the c-axis. We also measured the calibrated small-signal gain spectrum, over a range of eight orders of magnitude, of a single-mode, flared semiconductor amplifier. We found that the detailed-balance theory of semiconductor lasers theory is not consistent with our data. We used a self-pumped phase conjugator to determine a key calibration constant in our experiments.
Frequency Stabilization and Phase Locking of Laser Diodes and Laser Arrays
The major accomplishments for FY 86 were: 1. Demonstration of efficient coupling of an injection locked laser array single lobe output into a single mode optical fiber. A coupling efficiency of 30% was achieved for a 40-element array emitting 500 mW, corresponding to a fiber output power of 150 mW. 2. Demonstration of a novel external ring laser cavity operation of a gain guided array. The ring cavity relies on self-injection locking of the array by its own spatially filtered output. As in the case of injection locking, the ring laser external cavity results in single diffraction limited lobe far field emission of the array, but with the added advantage of eliminating the need for a separate master laser and the associated wavelength and temperature requirements.