US5077745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mode-locked solid-state ring laser
Assignee: Hamamatsu Photonics KK
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Filing: 1990-04-06
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Granted: 1991-12-31
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Expires: 2010-04-06
Abstract
Abstract Part of a solid-state lasing medium is made to be a mode locking section. An ultrasonic transducer being supplied with a high-frequency voltage generates an ultrasonic wave to propagate through the mode locking section. As a result, laser light pulses having a repetition frequency determined by the frequency of the ultrasonic wave are output from a laser apparatus.
Inventors
- 👤 Shinichiro Aoshima
- 👤 Kenshi Fukumitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:13
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/11; H01S3/1106; H01S3/1109; H01S3/05; H01S3/06; H01S3/0602; H01S3/0606; H01S3/08; H01S3/081; H01S3/083; H01S3/106; H01S3/1068; H01S3/108; H01S3/109
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
A mode-locked solid-state laser, comprising: a ring resonator; a solid-state lasing medium having a mode locking element integral therein for generating a laser beam; a second harmonic generation device spaced from said mode locking element of the lasing medium by one half of one complete round path length of the ring resonator; means for exciting said lasing medium to generate the laser beam; reflecting mirror means, coupled to the lasing medium, for receiving the laser beam and reflecting it into the lasing medium; output mirror means, coupled to the lasing medium, for outputting at least a portion of a generated laser beam to an external device coupled to the solid-state laser; and transducer means, coupled to the lasing medium, for providing an ultrasonic wave having a frequency to the lasing medium such that the ultrasonic wave propagates through the mode locking element of the lasing medium to generate a pulsed laser beam having a pulse frequency associated with the frequency of the ultrasonic wave.
Claim 2
Dependent Claim
164 words
A mode-locked solid-state laser, comprising: a ring resonator; a solid-state lasing medium having a mode locking element integral therein for generating a laser beam; a second harmonic generation device spaced from said mode locking element of the lasing medium by one half of one complete round path length of the ring resonator; means for exciting said lasing medium to generate the laser beam; reflecting mirror means, coupled to the lasing medium, for receiving the laser beam and reflecting it into the lasing medium; output mirror means, coupled to the lasing medium, for outputting at least a portion of a generated laser beam to an external device coupled to the solid-state laser; and transducer means, coupled to the lasing medium, for providing an ultrasonic wave having a frequency to the lasing medium such that the ultrasonic wave propagates through the mode locking element of the lasing medium to generate a pulsed laser beam having a pulse frequency associated with the frequency of the ultrasonic wave.
Claim 3
Dependent Claim
20 words
The mode-locked solid-state laser according to claim 1, wherein the output and reflecting mirror means are adjacent the lasing medium.
Claim 4
Dependent Claim
30 words
The mode-locked solid-state laser according to claim 1, wherein the output mirror means is adjacent the second harmonic generation device and the reflecting mirror means is adjacent the lasing medium.
Claim 5
Dependent Claim
45 words
The mode-locked solid-state laser according to claim 1, wherein the reflecting mirror means includes a pair of concave mirrors symmetrical with respect to the second harmonic generation device so that the second harmonic generation device is at the center of the pair of concave mirrors.
Claim 6
Dependent Claim
30 words
The mode-locked solid-state laser according to claim 2, wherein the output mirror means is adjacent the second harmonic generation device and the reflecting mirror means is adjacent the lasing medium.
Claim 7
Dependent Claim
45 words
The mode-locked solid-state laser according to claim 2, wherein the reflecting mirror means includes a pair of concave mirrors symmetrical with respect to the second harmonic generation device so that the second harmonic generation device is at the center of the pair of concave mirrors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-30 | 1995-07-01 | 1995-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-30 | 1999-07-01 | 1999-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-30 | 2003-07-01 | 2003-12-31 | $7700.00 | Window Closed / Lapsed |