In a semiconductor lasers using quantum well gain medium, a quantum well stack is mounted in an epi-down configuration. The epitaxial side of the device may be directly bonded to an efficient heat transport system so that heat may more easily leave the quantum well stack layers and be disposed at a heatsink. Such a device runs cooler and exhibits reduced loss mechanisms as represented by a laser system loss-line. External cavity systems using this configuration may permit a high degree of tunability, and these systems are particularly improved as the tuning range is extended by lowered cavity losses.

Claims

24 · 3 independent · depth 3

24 granted claims

›1.independentA source comprising:na thermally conductive substrate;a quantum well gain medium that is directly bonded to the thermally conductive substrate, the ga…+10

›2.↳ 1The source of claim 1 wherein the gain medium includes a pair of opposed sides that extend between the base side and the epi side, and wherein the gai…d2

›3.↳ 1The source of claim 1 wherein the gain medium includes emission facets that are planar surfaces formed in a natural plane of the quantum well stack op…d2

›4.↳ 1The source of claim 1 wherein the epi side is directly bonded to the thermally conductive substrate.d2

›5.↳ 1The source of claim 1 wherein the optical feedback element includes two opposing elements arranged to couple a feedback optical beam back into the qua…d2

›6.↳ 1The source of claim 1 wherein the thermally conductive substrate includes a carrier substrate portion that is formed of material having a thermal cond…d2+1

›8.↳ 1The source of claim 1 wherein the thermally conductive substrate has a thermal conductivity of greater than about 200 W/mK.d2

›9.↳ 1The source of claim 1 wherein the thermally conductive substrate has a thermal conductivity of between about 1500 and 2000 W/mK.d2

›10.↳ 1The source of claim 1 wherein the thermally conductive substrate includes copper.d2

›11.↳ 1The source of claim 1 further comprising a lens positioned between the feedback element and the gain medium, the lens having a short focal length and …d2

›12.independentA source comprising:na quantum well gain medium having a base side and an epi side;a thermally conductive substrate that is bonded to one of the sides…+5

›18.independentA source comprising:na thermally conductive substrate having a thermal conductivity of greater than about 200 W/mK;a quantum well gain medium having a…+6

Classifications

5 codes

IPC · International Patent Classification

Section H — Electricity

H01S3/08
H01S3/04

USPC · US Patent Classification

372/36372/92372/34

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Pendency

1.8 y

649 days filing → grant

Office actions

none on record

Responses

1 RCE

Examiner

Armando Rodriguez

art unit 2828 · TC 2800

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20090225802 A1	10 Sep 2009

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