Second harmonic Generation with achiral, Straight-chain carbamic acid derivatives
First Claim
1. A second harmonic generator comprising a laser source of coherent light radiation at a fixed fundamental frequency, an acentrically crystalline, achiral, organic compound, means for directing the output radiation of the laser onto said compound, and output means for utilizing the second harmonic frequency, said compound being a straight-chain N-nitrophenyl carbamyl compound crystallized in a non-centrosymmetric configuration, said crystalline compound being transparent to radiation at said fixed fundamental frequency and said second harmonic frequency, and said crystalline compound being a derivative of an N-nitrophenyl carbamic acid such that the straight chain is linked to the carbamyl carbon atom by an oxygen atom or nitrogen atom.
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Abstract
Devices for and method of generating coherent second harmonic light radiation. The devices comprise a laser source of coherent light radiation at a fixed fundamental frequency, an acentrically crystalline, achiral, straight-chain N-nitrophenyl carbamyl compound, means for directing the output radiation of the laser onto the acentrically crystalline, achiral, straight-chain N-nitrophenyl carbamyl compound, and output means for utilizing the second harmonic frequency. N-nitrophenyl carbamyl compounds, and acentric crystals thereof that are capable of being used in the aforementioned devices and method, are also described herein.
32 Citations
8 Claims
- 1. A second harmonic generator comprising a laser source of coherent light radiation at a fixed fundamental frequency, an acentrically crystalline, achiral, organic compound, means for directing the output radiation of the laser onto said compound, and output means for utilizing the second harmonic frequency, said compound being a straight-chain N-nitrophenyl carbamyl compound crystallized in a non-centrosymmetric configuration, said crystalline compound being transparent to radiation at said fixed fundamental frequency and said second harmonic frequency, and said crystalline compound being a derivative of an N-nitrophenyl carbamic acid such that the straight chain is linked to the carbamyl carbon atom by an oxygen atom or nitrogen atom.
- 6. A process for converting a fixed fundamental frequency of coherent laser light into a second harmonic frequency which comprises passing said laser light through a nonlinear optical element comprising an acentrically crystalline, achiral, organic compound, said compound being a straight-chain N-nitrophenyl carbamyl compound crystallized in a non-centrosymmetric configuration, said crystalline compound being transparent to said fixed fundamental frequency and to said second harmonic frequency, and said crystalline compound being a derivative of an N-nitrophenyl carbamic acid such that the straight chain is linked to the carbamyl carbon atom by one member of a group consisting of an oxygen atom and nitrogen atom.
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