Presentation Title

Second Harmonic Generation in Nonlinear Organic and Inorganic Crystals

Faculty Mentor

Dr. Tim Usher

Start Date

17-11-2018 12:30 PM

End Date

17-11-2018 2:30 PM

Location

CREVELING 41

Session

POSTER 2

Type of Presentation

Poster

Subject Area

physical_mathematical_sciences

Abstract

The study of ferroelectric materials is of interest due to their usefulness in electronics, specifically where material characteristics require a remnant polarization. Second Harmonic Generation (SHG) is a necessary, but not sufficient condition for ferroelectricity. We investigated Second Harmonic Generation in nonlinear materials using a laboratory laser along with various standards and unknowns. SHG occurs in nonlinear materials where the sinusoidal wave’s frequency being transmitted is doubled, producing a new wavelength emitted by the material. The laser we used was a Q-Switched Nd:YAG Laboratory Laser that generates an infrared wavelength of 1064 nanometers, with 0.7 Joules of energy per pulse every 20 nanoseconds. The standard compounds analyzed were potassium dihydrogen phosphate (KDP) and ammonium dihydrogen phosphate (ADP), both giving a positive Second Harmonic Generation response, yielding a green light of 532 nm wavelength. The transformation from infrared light to the higher energy green light is a clear indication of SHG. A .92-millimeter unknown sample tested was melamine hydrochloride hemihydrate, which gave a stronger positive response than the known standards. This puts it one step closer to making it a potentially new ferroelectric compound.

This research was supported by the National Science Foundation under the CREST program,

(NSF-HRD #1345163)

Second Harmonic Generation, Ferroelectric, Electronics, Laser

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Nov 17th, 12:30 PM Nov 17th, 2:30 PM

Second Harmonic Generation in Nonlinear Organic and Inorganic Crystals

CREVELING 41

The study of ferroelectric materials is of interest due to their usefulness in electronics, specifically where material characteristics require a remnant polarization. Second Harmonic Generation (SHG) is a necessary, but not sufficient condition for ferroelectricity. We investigated Second Harmonic Generation in nonlinear materials using a laboratory laser along with various standards and unknowns. SHG occurs in nonlinear materials where the sinusoidal wave’s frequency being transmitted is doubled, producing a new wavelength emitted by the material. The laser we used was a Q-Switched Nd:YAG Laboratory Laser that generates an infrared wavelength of 1064 nanometers, with 0.7 Joules of energy per pulse every 20 nanoseconds. The standard compounds analyzed were potassium dihydrogen phosphate (KDP) and ammonium dihydrogen phosphate (ADP), both giving a positive Second Harmonic Generation response, yielding a green light of 532 nm wavelength. The transformation from infrared light to the higher energy green light is a clear indication of SHG. A .92-millimeter unknown sample tested was melamine hydrochloride hemihydrate, which gave a stronger positive response than the known standards. This puts it one step closer to making it a potentially new ferroelectric compound.

This research was supported by the National Science Foundation under the CREST program,

(NSF-HRD #1345163)

Second Harmonic Generation, Ferroelectric, Electronics, Laser