H01S 5/3401
Having no pn junction
Official title: {having no PN junction, e.g. unipolar lasers, intersubband lasers, quantum cascade lasers}
H01S5/3401 (Having no pn junction) appears on 555 US grants and 621 published applications in this corpus.
Search patents in H01S- Granted patents
- 555
- Published applications
- 621
- Assignees
- 195
- Inventors
- 791
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 4 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 5 | 0 |
| 2000 | 9 | 0 |
| 2001 | 4 | 0 |
| 2002 | 8 | 5 |
| 2003 | 7 | 10 |
| 2004 | 12 | 7 |
| 2005 | 3 | 9 |
| 2006 | 2 | 8 |
| 2007 | 8 | 11 |
| 2008 | 7 | 13 |
| 2009 | 7 | 13 |
| 2010 | 13 | 21 |
| 2011 | 23 | 26 |
| 2012 | 14 | 38 |
| 2013 | 15 | 31 |
| 2014 | 28 | 27 |
| 2015 | 39 | 39 |
| 2016 | 34 | 30 |
| 2017 | 36 | 47 |
| 2018 | 38 | 43 |
| 2019 | 42 | 36 |
| 2020 | 29 | 33 |
| 2021 | 30 | 46 |
| 2022 | 22 | 30 |
| 2023 | 28 | 44 |
| 2024 | 20 | 18 |
| 2025 | 20 | 23 |
| 2026 | 37 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Devices and methods for quartz enhanced photoacoustic spectroscopy6 Oct 2026US 12,756,156 B2Pendar Technologies, LLC
- Bandwidth enhancement of quantum dot/well hybrid III-V/silicon micro-ring lasers6 Oct 2026US 12,756,158 B2Hewlett Packard Enterprise Development LP
- Quantum cascade laser element and quantum cascade laser device29 Sep 2026US 12,749,873 B2Hamamatsu Photonics K.K.
- Technologies for a phase-locked terahertz plasmonic laser array with microcavities8 Sep 2026US 12,731,961 B2Lehigh University
- Semiconductor laser structure for higher-order mode suppression25 Aug 2026US 12,719,234 B2FreeSpace Photonics, Inc.
- Semiconductor optical amplifier for laser devices, particularly of the quantum cascade type, and laser device comprising said optical amplifier8 Oct 2026US 2026/0312369 A1Pjfc Semiconductors Societa' A Responsabilita' Limitata Semplificata
- Quantum cascade laser device and method for manufacturing quantum cascade laser device1 Oct 2026US 2026/0302731 A1Mitsubishi Electric Corporation
- Output module for high-power external-cavity tunable quantum cascade laser6 Aug 2026US 2026/0229844 A1Beijing University of Technology
- Quantum cascade laser with mode shaping waveguide coupler25 Jun 2026US 2026/0180288 A1Irglare, LLC
- High-power, high-efficiency infrared-emitting quantum cascade lasers4 Jun 2026US 2026/0155629 A1
Most cited
By later US patents
- Silicon-based strain-symmetrized GE-SI quantum lasers135US 6,154,475 AThe United States of America as represented by the Secretary of the Air Force · 2000
- Spatially coherent surface-emitting, grating coupled quantum cascade laser with unstable resonance cavity133US 6,560,259 B1Applied Optoelectronics, Inc. · 2003
- Unipolar semiconductor laser92US 5,457,709 AAT&T IPM Corp. · 1995
- Optoelectronic quantum well device having an optical resonant cavity and sustaining inter subband transitions67US 5,818,066 AThomson-CSF · 1998
- Colloidal nanocrystals with high photoluminescence quantum yields and methods of preparing the same65US 6,869,545 B2Board of Trustees of the University of Arkansas · 2005