# US 2013/0158528 A1 · NONLINEAR OPTICAL CdSiP2 CRYSTAL FOR USE IN SURGICAL LASER

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- Number: US 2013/0158528 A1
- Document ID: US20130158528A1
- Status: Published application
- Kind: A1
- Application number: 13/741,456
- Filed: 2013-01-15
- Published: 2013-06-20
- Earliest claimed: 2008-10-23
- Assignees: BAE Systems Information and Electronic Systems Integration Inc.
- Inventors: Peter G. Schunemann; Kevin T. Zawilski
- Web page: https://patentgrep.com/patent/US20130158528A1

## CPC

- G02F 1/35: Non-linear optics
- A61B 18/20: using laser
- G02F 1/3551: {Crystals}
- 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
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

CdSiP2 crystals with sizes and optical quality suitable for use as nonlinear optical devices are disclosed, as well as NLO devices based thereupon. A method of growing the crystals by directional solidification from a stoichiometric melt is also disclosed. The disclosed NLO crystals have a higher nonlinear coefficient than prior art crystals that can be pumped by solid state lasers, and are particularly useful for frequency shifting 1.06 μm, 1.55 μm, and 2 μm lasers to wavelengths between 2 μm and 10 μm. Due to the high thermal conductivity and low losses of the claimed CdSiP2 crystals, average output power can exceed 10 W without severe thermal lensing. A 6.45 μm laser source for use as a medical laser scalpel is also disclosed, in which a CdSiP2 crystal is configured for non-critical phase matching, pumped by a 1064 nm Nd:YAG laser, and temperature-tuned to produce output at 6.45 μm.

## Claims

### Claim 1

An infrared laser surgery scalpel, comprising a single crystal of CdSiP2 having NLO properties, into which at least one incident beam of electromagnetic radiation can be directed so as to generate electromagnetic radiation emerging from said crystal that includes an output wavelength of substantially about 6.45 μm.

### Claim 2 (depends on 1)

The nonlinear optical device of claim 1, wherein the at least one incident beam is a single incident beam produced by a solid-state laser having a wavelength of substantially about 1064 nm.

### Claim 3 (depends on 1)

The nonlinear optical device of claim 1, wherein the nonlinear optical device is configured for non-critical phase matching and the electromagnetic radiation emerging from said crystal is temperature tuned so as to include a wavelength of substantially about 6.45 μm.