1998
DOI: 10.1117/12.308097
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<title>Fiber-coupling technique for high-power diode laser arrays</title>

Abstract: Monolithic linear arrays of diode lasers, also known as diode laser bars, are the basic elements for most high-power laser applications such as solid-state laser pumping or material processing. Cylindrical microlenses used as fast-axis collimators for 10-mm diode bars require very high angles of aperture (up to 100 degree FWI/e2, equivalent to a numerical aperture of approx. 0.8) to capture most of the emitted laser power. For the efficient longitudinal pumping of laser rods, or the narrow focusing of the diod… Show more

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Cited by 22 publications
(5 citation statements)
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“…Customary high-power fiber coupled modules utilize passively cooled laser diode bars or actively cooled laser diode stacks with an emitting aperture of 10 mm. However, the use of standard bars requires complex beam-shaping techniques and a proper thermal and electrical management [15] . As more and more power out of the fiber is wanted and the need for higher brightness arises, designing such pump systems becomes a challenge, resulting in higher production as well as higher operating costs.…”
Section: Introductionmentioning
confidence: 99%
“…Customary high-power fiber coupled modules utilize passively cooled laser diode bars or actively cooled laser diode stacks with an emitting aperture of 10 mm. However, the use of standard bars requires complex beam-shaping techniques and a proper thermal and electrical management [15] . As more and more power out of the fiber is wanted and the need for higher brightness arises, designing such pump systems becomes a challenge, resulting in higher production as well as higher operating costs.…”
Section: Introductionmentioning
confidence: 99%
“…A single diode bar is a monolithical linear array, typically made up of up to ∼ 50 sub-arrays. Each of these sub-arrays can either contain up to a few tens of single emitters or be made up of a broad-area single emitter (see for instance [22]). From now on, we will refer to each diode bar sub-array as a ''sub-array emitter'' or simply ''emitter''.…”
Section: The Modelmentioning
confidence: 99%
“…Notice that the normal to the emitter surface (𝐞 𝑦 in this case) is the same for all the emitters of a diode bar. Also, in the case of fiber-coupling [22] 𝜑 0 = 𝜃 0 , and 𝑥 𝑠 specifies the fiber output position. We observe that this formula, provided by [23], takes into account a possible focusing of the radiation emitted by the bar, typically obtained using a lenslet with optical axis along 𝐞 𝑦 and centered on 𝑥 = 𝑧 = 0.…”
Section: Fundamental Equationsmentioning
confidence: 99%
“…Devices with small fast axis divergence, realized with so-called large optical cavity (LOC) 1 structures and FW 0.95 below about 50° relax collimation. Bars with high fast axis divergence and FW 0.95 larger than 90° require extreme high NA fast axis collimators (FAC) 2 . Important imperfections of laser bars, which are relevant for fiber-coupling, are the so-called smile, which is the peakto-valley fast axis decentration of the emitter center positions from a straight line, mainly caused by the soldering process of the semiconductor chip onto the heat spreader and a slow axis boresight error of the individual emitters i.e.…”
Section: Laser Diode Barsmentioning
confidence: 99%