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US5315433A
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Optical wavelength converting apparatus
Assignee: Fujifilm Holdings Corp
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Filing: 1992-02-28
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Granted: 1994-05-24
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Expires: 2012-02-28
Abstract
Abstract In an optical wavelength converting apparatus, a fundamental wave impinges upon a crystal of a nonlinear optical material, the type II of phase matching between the fundamental wave and its second harmonic is effected, and the second harmonic of the fundamental wave is thereby radiated out of the optical wavelength converting apparatus. Two crystals constituted of the same material are employed as the crystal. The two crystals have equal lengths and are located in orientations such that corresponding optic axes may be shifted 90° from each other. The optical wavelength converting apparatus yields the second harmonic having the maximum possible output power and yet can be kept small in size and low in cost.
Inventors
- 👤 Yoji Okazaki
- 👤 Chiaki Goto
- 👤 Hiroaki Hyuga
- 👤 Akinori Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:47
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/108; H01S3/109; G02F1/353; G02F1/3544; G02F1/3546; G02F1/355; G02F1/3551; G02F1/3553
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
An optical wavelength converting apparatus in which a crystal structure formed of nonlinear optical material is provided to receive a fundamental wave and to emit a second harmonic of the fundamental wave, said structure being formed and oriented for type II phase matching between the fundamental wave and the second harmonic, said structure comprising two crystals, each formed of said optical material, and together forming said crystal structure, wherein said two crystals have substantially equal lengths and are oriented with respect to each other such that corresponding optic axes of said crystals are shifted substantially 90° from each other.
Claim 2
Dependent Claim
99 words
An optical wavelength converting apparatus in which a crystal structure formed of nonlinear optical material is provided to receive a fundamental wave and to emit a second harmonic of the fundamental wave, said structure being formed and oriented for type II phase matching between the fundamental wave and the second harmonic, said structure comprising two crystals, each formed of said optical material, and together forming said crystal structure, wherein said two crystals have substantially equal lengths and are oriented with respect to each other such that corresponding optic axes of said crystals are shifted substantially 90° from each other.
Claim 3
Dependent Claim
44 words
An apparatus as defined in claim 1 wherein said two crystals are disposed such that a single polished face of one of said two crystals and a single polished face of the other of said two crystals are in close contact with each other.
Claim 4
Dependent Claim
30 words
An apparatus as defined in claim 1 wherein a laser beam, which has been obtained by pumping a solid laser medium, impinges as the fundamental wave upon said two crystals.
Claim 5
Dependent Claim
28 words
An apparatus as defined in claim 3 wherein said two crystals and said solid laser medium are located such that they are in close contact with one another.
Claim 6
Dependent Claim
21 words
An apparatus as defined in claim 3 wherein a pumping source for pumping said solid laser medium is a laser diode.
Claim 7
Dependent Claim
21 words
An apparatus as defined in claim 3 wherein said crystal structure is located inside of a resonator of a solid laser.
Claim 8
Dependent Claim
24 words
An apparatus as defined in claim 3 wherein YVO 4 , which has been doped with Nd, is employed as said solid laser medium.
Claim 9
Dependent Claim
22 words
An apparatus as defined in claim 1 wherein said crystal structure formed of said nonlinear optical material is a KTP crystal structure.
Claim 10
Dependent Claim
73 words
An apparatus as defined in claim 8 wherein each of said two crystals of said KTP crystal structure has been cut along a plane which has been rotated 24° from its YZ plane around its Z axis, and is oriented such that the fundamental wave impinges perpendicularly upon the cut surface such that a direction of linear polarization of the fundamental wave forms an angle of 45° with respect to the Z axis.
References Cited (Backward Citations)
US5047668A
Cited
US5117126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |