By Nils W. Carlson, A.L. Schawlow
Over the final 20 years, the quest for a compact, high-power semiconductor resource has produced many designs and ideas for monolithic diode-laser arrays and optical amplifiers. although, just a couple of layout methods have emerged with the possibility of generating high-power, high-brightness monolithic assets. even though semiconductor-diode lasers are the main compact, optimum achieve and most productive laser resources, demanding situations stay in constructing constructions that may produce top quality, diffraction-limited output beams. This publication offers and analyzes the result of paintings played during the last two decades within the improvement of high-brightness diode-laser arrays.
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Extra info for Monolithic Diode-Laser Arrays
3 front-facet reflectivities. 3 frontfacet reflectivity, the peak efficiency is maximized at a shorter cavity length. 16) by increasing output-coupling coefficient aout. As mentioned above, the peak conversion efficiency is a function of aout, so that for any length L, one can readjust the front-facet reflectivity Rl so that the peak conversion efficiency is again maximized. 30) increases monotonically with increasing cavity length, but it eventually levels off and saturates as L is increased beyond l/a.
The negative dispersion of the semiconductor material has the effect of increasing the apparent cavity length relative to what it would be for the case of zero dispersion in the cavity. The subject of single-longitudinal mode operation will be treated in more detail in Chap. 3. 324]. Here Jo is the current density at transparency, which corresponds to G = 0, and the coefficient A has units of cm/ A. Note that the parameters A and J o depend on temperature, as well as the details of the laser structure.
Distributed-output coupling has an advantage over end coupling in that as the laser length is scaled to obtain higher-power output, the power-extraction efficiency remains constant. In contrast, the power extraction efficiency of the end-coupled laser decreases as the inverse of the cavity length, as discussed in Chap. 2. 2. Fundamentals of High-Power Operation The fundamentals and basic concepts that are important for our understanding the physics and technological issues related to high-power, single-mode diode-laser arrays are presented.