Antiguiding index profiles in broad strip semiconductor lasers for high-power, single-mode operation

Modal control in semiconductor optical waveguides with uniaxially patterned layers

“…It can be used for shaping the mode field in the laser stripe, to achieve desirable properties, similar to those obtained by the parabolic etching of the stripe or the parabolic variation of the material index. An example of such properties is the onemode high-power generation in a shaped unstable resonator laser design [26], [27]. It is known that one way of obtaining a large gain difference between the fundamental mode and higher-order modes is to use structure profiles with a strong real-index antiguiding and weak imaginary-index guiding.…”

Photo-selective chemical etching of InAs and GaSb to manufacture microscopic mirrors

“…A parabolic profile of the mirror is best suited to obtain single mode operation in an unstable resonator [8,9].…”

Propagating modes in gain-guided optical fibers

“…[10][11][12][13] Gain-guiding effects have the particularly useful property that they can produce stable and confined waveguide modes even in compound systems characterized by index antiguiding, that is, even in systems whose transverse index profiles will not by themselves support confined or guided modes. 14,15 There does not seem to have been a complete analysis to date, however, of the propagating modes for the elementary case of a uniform step-profile optical fiber whose cylindrical core contains an arbitrary amount of uniform gain guiding combined with an arbitrary amount of conventional index guiding or antiguiding. There may be some practical interest in structures of this type, for example in high-power single-mode fiber lasers, 16 and this paper therefore derives the elementary mode propagation properties of such fibers.…”