# US 6,296,784 B1 · Cesium-lithium-borate crystal and its application to frequency conversion of laser light

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- Number: US 6,296,784 B1
- Document ID: US6296784B1
- Status: Granted
- Kind: B1
- Application number: 08/503,083
- Filed: 1995-07-17
- Granted: 2001-10-02
- Earliest claimed: 1994-07-18
- Assignees: Research Development Corporation of Japan
- Inventors: Takatomo Sasaki; Akio Hiraki; Yusuke Mori; Sadao Nakai
- Web page: https://patentgrep.com/patent/US6296784B1

## CPC

- C30B 29/22: Complex oxides
- C30B 15/00: Single-crystal growth by pulling from a melt, e.g. Czochralski method (under a protective fluid C30B27/00)
- C30B 17/00: Single-crystal growth onto a seed which remains in the melt during growth, e.g. Nacken-Kyropoulos method (C30B15/00 takes precedence)
- C30B 29/10: Inorganic compounds or compositions
- G02F 1/353: {Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams}
- G02F 1/3551: {Crystals}
- G02F 1/3553: {having the formula MTiOYO4, where M=K, Rb, TI, NH4 or Cs and Y=P or As, e.g. KTP}
- G02F 1/37: for second-harmonic generation {(G02F1/3532 takes precedence)}
- G02F 2201/16: series; tandem
- C30B: SINGLE-CRYSTAL GROWTH (by using ultra-high pressure, e.g. for the formation of diamonds, B01J3/06); UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL (zone-refining of metals or alloys C22B); PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE (casting of metals, casting of other substances by the same processes or devices B22D; working of plastics B29; modifying the physical structure of metals or alloys C21D, C22F); SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE (for producing semiconductor devices or parts thereof H10); APPARATUS THEREFOR
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

The present invention provides a cesium-lithium-borate crystal, which can be used as a high-performance wavelength converting crystal, having a chemical composition expressed as CsLiB6O10, and substituted cesium-lithium-borate crystals expressed by the following formula: Cs1−xLi1−yMx+yB6O10 or Cs2(1−z)Li2LzB12O20 (where, M is an alkali metal element, and L is an alkali earth metal element); a method for manufacturing same by heating and melting; and an optical apparatus using such crystals

## Claims

### Claim 1

A cesium-lithium-borate crystal having a chemical composition consisting of CsLiB6O10.

### Claim 2 (depends on 1)

A method for manufacturing a crystal as claimed in claim 1, which comprises forming a mixture comprising a source of Cs, Li, B and O, and heating and melting the mixture to a temperature sufficient to form said crystal.

### Claim 3 (depends on 2)

The method for manufacturing a crystal according to claim 2, which comprises a step of growing the crystal by the melt method.

### Claim 4 (depends on 2)

The method for manufacturing a crystal according to claim 2, which comprises a step of growing the crystal by the flux method.

### Claim 5

A cesium-lithium-borate crystal having a chemical composition consisting of Cs1−xLi1−yMx+yB6O10 wherein M is at least one alkali metal element other than Cs and Li, and wherein x and y satisfy the relationship of 0<x<1 and 0<y<1.

### Claim 6 (depends on 5)

The crystal according to claim 5, wherein M is at least one alkali metal element selected from the group consisting of Na, K and Rb.

### Claim 7 (depends on 5)

A method for manufacturing a crystal as claimed in claim 5, which comprises forming a mixture comprising a source of Cs, Li, B, O, and M, wherein M has the same meaning as defined in claim 5, and heating and melting the mixture to a temperature sufficient to form said crystal.

### Claim 8 (depends on 7)

The method for manufacturing a crystal according to claim 7, which comprises a step of growing the crystal by the melt method.

### Claim 9 (depends on 7)

The method for manufacturing a crystal according to claim 7, which comprises a step of growing the crystal by the flux method.

### Claim 10 (depends on 5)

A frequency converting apparatus which contains a crystal according to claim 5.

### Claim 11 (depends on 10)

The apparatus according to claim 10, which generates a second, third, fourth or fifth harmonic of a laser.

### Claim 12 (depends on 5)

An optical parametric oscillator which contains a crystal according to claim 5.

### Claim 13

A cesium-lithium-borate crystal having a chemical composition consisting of Cs2(1−z)Li2LzB12O20, wherein L is at least one alkaline earth metal ion, Mg or Be and wherein 0<z<1.

### Claim 14 (depends on 13)

The crystal according to claim 13, wherein L is at least one alkaline earth metal ion selected from the group consisting of Ba, Sr and Ca.

### Claim 15 (depends on 13)

A method for manufacturing a crystal as claimed in claim 13, which comprises forming a mixture comprising a source of Cs, Li, B, O, and L, wherein L has the same meaning as defined in claim 13, and heating and melting the mixture to a temperature sufficient to form said crystal.

### Claim 16 (depends on 15)

The method for manufacturing a crystal according to claim 15, which comprises a step of growing the crystal by the melt method.

### Claim 17 (depends on 15)

The method for manufacturing a crystal according to claim 15, which comprises a step of growing the crystal by the flux method.

### Claim 18 (depends on 13)

A frequency converting apparatus which contains a crystal according to claim 13.

### Claim 19 (depends on 18)

The apparatus according to claim 18, which generates a second, third, fourth or fifth harmonic of a laser.

### Claim 20 (depends on 13)

An optical parametric oscillator which contains a crystal according to claim 13.