A quantum cascade laser is configured to include a semiconductor substrate and an active layer which is provided on the substrate and has a cascade structure formed by multistage-laminating unit laminate structures 16 each including an emission layer 17 and an injection layer 18. The unit laminate structure 16 has, in its subband level structure …

Legal parties

Inventors (applicants): Masamichi Yamanishi, Naota Akikusa, Kazuue Fujita, Tadataka Edamura
Assignees (initial): Hamamatsu Photonics K.K. (Hamamatsu-shi, Shizuoka, JP)
Agents: Drinker Biddle & Reath LLP (attorney)

The application was examined by Jessica Stultz (USPTO dept. 2828), Sean Hagan


  • 1. A quantum cascade laser comprising: …
  • 2. The quantum cascade laser according to claim 1 , wherein …
  • 3. The quantum cascade laser according to claim 1 , wherein in the unit laminate …

International priority data

JP: P2009-179531 / Jul. 31, 2009 (national)

Cited documents


  • JP 08-279647, Oct. 1, 1996
  • JP 2008-060396, Mar. 1, 2008
  • Capasso et al. US 5745516 A, Apr. 1, 1998
  • JP 2000-012983, Jan. 1, 2000
  • Sekiguchi et al. US 2006/0039431 A1 / 372/44.01, Feb. 1, 2006
  • JP 2004-247492, Sep. 1, 2004
  • JP 2000-151026, May. 1, 2000
  • JP 2009-152508, Jul. 1, 2009
  • WO 2008/087754, Jul. 1, 2008
  • JP 10/144995, May. 1, 1998
  • Capasso et al. US 6148012 A / 372/45.012, Nov. 1, 2000
  • Faist et al. US 6922427 B2, Jul. 1, 2005
  • Faist et al. US 6751244 B2, Jun. 1, 2004
  • JP 10/004242, Jan. 1, 1998
  • JP 2008-177366, Jul. 1, 2008
  • Capasso et al. US 5457709 A, Oct. 1, 1995
  • Capasso et al. US 6324199 B1 / 372/45.01, Nov. 1, 2001

Brief Description of the Drawings

FIG. 1 is a view schematically showing a basic configuration of a quantum cascade laser. FIG. 2 is a diagram showing an example of a subband level structure in an active …


Background of the Invention

1. Field of the Invention The present invention relates to a quantum cascade laser using intersubband transition in a quantum well structure. 2. Related Background Art Light with a mid-infrared …

Description of the Preferred Embodiments

Hereinafter, preferred embodiments of a quantum cascade laser according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same …

More details about Quantum Cascade Laser

Miscellaneous patent data

Assigned to a foreign company or corporation, application examiners - Jessica Stultz, Sean Hagan (2828 USPTO department), the grant date is Feb. 18, 2014 (publication date), the assignee location is Hamamatsu-shi, Shizuoka (JP); its company is Hamamatsu Photonics K.K., the claim 1 is exemplary as chosen by the examiner, illustrated by 14 drawings, invented by Naota Akikusa et al., the known inventor's name is Fujita Kazuue, the application publication date is May. 18, 2010, the grant number is 08654809 (publication number), particularly claims a quantum cascade laser comprising…, the exemplary patent drawings are Quantum Cascade Laser, View schematically showing a basic, Diagram showing another example of a subband, Diagram showing an example of a subband, the known agent's company is Drinker Biddle & Reath LLP, the recorded applicant's name is Akikusa Naota, the invention is named Quantum Cascade Laser, similar documents are classified under Traveling wave, characterised by the material used as the active medium, Cooling arrangements, coherent light, Stabilisation of laser output parameters, e.g. frequency, amplitude, controlling the active medium, e.g. by controlling the processes or apparatus for excitation, Producing plural wavelength output, Birefringent material, Plural active media or active media having plural dopants, Absorption type, explained by 14 figures, the application number is 12/782,255 (U.S.), claims 1-4 comprise the invention scope, categorized under Particular current control structure as a primary classification.

Invention classification information

The invention is classified under Semiconductor lasers, Particular current control structure.

Patent details
Publication number 08654809
Publication date Feb. 18, 2014
Kind code B2
Application number 12/782,255
Application date May. 18, 2010
Application type U
Application series code 12
National classification 372/46.01
Total number of claims 4
Exemplary claims 1
Number of drawings 14
Number of figures 14
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