This paper introduces a novel tunable external-cavity diode laser based on the grating light valve (GLV) technology, which has the advantages of high speed, high reliability, low cost and compactness. A theoretical model is present on this tunable laser and the configuration parameters are calculated to illustrate the practical signifiance of the laser.
A novel optical element, Dual-Cylindrical Prism, designed to generate and homogenize a laser beam line at an arbitrary working distance, is presented. The element with entrance surface consisting of two cylindrical shaped concave surfaces, and exit surface a single cylindrical concave, splits and overlaps the laser beam along fast axis and collimates the beam along slow axis, redistributing the diode laser output beam to a line with uniform intensity distribution and flexible working distance. The technique to design such a device is provided, and the computer-aided simulation results demonstrate the uniformity of the laser line and also the feasibility of such a device.
KEYWORDS: Tolerancing, Semiconductor lasers, Multimode fibers, Diodes, Packaging, High power lasers, Broad area laser diodes, Ray tracing, 3D modeling, Cladding
A theoretical model is presented to calculate the fiber coupling efficiency and alignment tolerances for the case of a 980nm 100μm broad-area diode laser directly coupled to a 100μm round-shaped cylindrical lensed multimode fiber. Both radius and wedge angle of the round-shaped cylindrical lens are optimized for maximum coupling efficiency. It is found that with proper design, a coupling efficiency of up to 98% may be obtained theoretically. The alignment tolerances for all three directions (vertical, horizontal, and axial offsets) are also calculated. It is found that the vertical offset (X-offset) tolerance is the most critical one among three, but is still acceptable (~2μm) for low-cost practical packaging. It is also found that the distance between the diode and the fiber, and the lens shape on the fiber can be further varied to improve this tolerance.
This paper introduces a novel wavelength switch based on the grating light valve (GLV) technology, which has the advantage of high speed, high reliability, low cost and compactness. A theoretical model is presented on this wavelength switch and the configuration parameters are calculated. The insertion loss is found to be reasonably low, leading to the practical significance of this novel wavelength switch.
A theoretical model is presented to calculate the fiber coupling efficiency and alignment tolerances for the case of a 980nm pump laser diode directly coupled to a round-shaped cylindrical lensed fiber (CLF). Both radius and wedge angle of the round-shaped cylindrical lens are optimized for maximal coupling efficiency. It is found that with proper design, a coupling efficiency up to 98% may be obtained theoretically. The alignment tolerances for all three directions (vertical, horizontal and axial offsets) are also calculated, and found that the vertical offset tolerance is critical and presents the biggest challenge in packaging. In addition, it is also found that both LD-to-CLF distance and lens shape affect the vertical offset tolerance, and can be varied to improve this tolerance.
In this paper, a novel micro pseudo-spherical lens is proposed to resolve the intrinsic high insertion loss problem associated with the micro spherical lens, and yet retain its other good qualities. The design parameters for this micro pseudo-spherical lens are optimized using Gaussian beam matrix propagation method. A geometric ray-tracing program is also used to calculate the coupling efficiency for collimator pairs. The simulation results for all four different types of micro lenses (pseudo-spherical, spherical, aspheric and GRIN lenses) are presented and compared to experimental results. It is shown that the novel micro pseudo-spherical lens presents significant performance improvement over the micro spherical lens, and offer similar performance to GRIN and micro aspheric lenses.
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