H01S 3/1304
By using an active reference
Official title: {by using an active reference, e.g. second laser, klystron or other standard frequency source (H01S3/139 takes precedence; automatic control of electronic generators H03L7/00)}
H01S3/1304 (By using an active reference) appears on 100 US grants and 96 published applications in this corpus.
Search patents in H01S- Granted patents
- 100
- Published applications
- 96
- Assignees
- 82
- Inventors
- 245
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 2 |
| 2003 | 3 | 1 |
| 2004 | 1 | 0 |
| 2005 | 1 | 1 |
| 2006 | 1 | 3 |
| 2007 | 2 | 0 |
| 2008 | 2 | 2 |
| 2009 | 1 | 0 |
| 2010 | 1 | 1 |
| 2011 | 1 | 2 |
| 2012 | 1 | 2 |
| 2013 | 3 | 2 |
| 2014 | 2 | 3 |
| 2015 | 6 | 6 |
| 2016 | 5 | 3 |
| 2017 | 3 | 3 |
| 2018 | 4 | 3 |
| 2019 | 3 | 5 |
| 2020 | 9 | 7 |
| 2021 | 3 | 9 |
| 2022 | 11 | 10 |
| 2023 | 7 | 12 |
| 2024 | 8 | 9 |
| 2025 | 8 | 6 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and apparatus for measuring a time delay between pairs of pulses from laser pulse sequences, and applications thereof24 Mar 2026US 12,586,977 B2Ludwig-Maximilians-Universitaet Muenchen
- Monitoring device, monitoring method, optical amplifier, and optical transmission system30 Dec 2025US 12,512,642 B2NEC Corporation
- High-precision repetition rate locking apparatus for ultra-fast laser pulse7 Oct 2025US 12,438,335 B2Chongqing Huapu Intelligent Equipment Co., Ltd.
- Method for amplifying an optical seed beam29 Jul 2025US 12,374,848 B2Northrop Grumman Systems Corporation
- Single emitter stacking for wavelength-beam-combining laser systems10 Jun 2025US 12,327,974 B2WBC Photonics, Inc.
- Method and system to stabilize a frequency sum generated laser13 Aug 2026US 2026/0237955 A1ASML Netherlands B. V.
- Phase synchronization laser device6 Aug 2026US 2026/0229841 A1Mitsubishi Electric Corporation
- Laser system and laser stabilization method21 May 2026US 2026/0142437 A1Korea Advanced Institute of Science and Technology
- Measurement and control of the frequency of an optical signal30 Apr 2026US 2026/0121369 A1TOPTICA Photonics AG
- Frequency difference adjuster, frequency difference adjustment method, laser generation apparatus, and electronic device27 Nov 2025US 2025/0364776 A1Huawei Technologies Co., Ltd.
Most cited
By later US patents
- Frequency locking device160US 4,925,302 AHewlett-Packard Company · 1990
- Miniature frequency standard based on all-optical excitation and a micro-machined containment vessel76US 6,806,784 B2National Institute of Standards and Technology · 2004
- Self-referenced locking of optical coherence by single-detector electronic-frequency tagging38US 7,187,492 B1The United States of America as represented by the Secretary of the Air Force · 2007
- Two-wavelength phase control system34US 4,295,741 AUnited Technologies Corporation · 1981
- MOPA laser apparatus with two master oscillators for generating ultraviolet radiation29US 7,593,440 B2Coherent, Inc. · 2009