High-power phased array and tailored gain semiconductor lasers

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5950410

Lindsey, C P

Most phase locked semiconductor laser arrays suffer from undesirable twin lobed farfield patterns, making them unsuitable for many applications. This thesis makes a detailed theoretical and experimental study of this problem, and solves it by tailoring the spatial gain profile across the array. Stripe geometry lasers for use in phased arrays are examined in Chapter 2, as are design considerations for evanescently coupled phased arrays. A powerful numerical method for analyzing a nearly arbitrary one-dimensional dielectric waveguide with gain and/or loss is described. Chapter 3 analyzes in detail the simplest array of two adjacent waveguides, both real index and gain guided and both weakly and strongly coupled. Chapter 4 discusses why a uniform array has a twin lobed farfield pattern, and introduces the concept of a nonuniform real index guided chirped array of lasers with widths which increase monotonically across the array. Chapter 5 demonstrates another method for gain tailoring, the halftone process, which can create nearly arbitrary two-dimensional spatial gain profiles in an optoelectronic device, thereby offering a new degree of freedom to the designer of semiconductor lasers.

• Research Organization: California Inst. of Tech., Pasadena (USA)
• OSTI ID: 5950410
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
GAIN
LASERS
MODE LOCKING
NUMERICAL SOLUTION
ONE-DIMENSIONAL CALCULATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
WAVEGUIDES