FIR Cherenkov-type difference frequency generation in a nonlinear optical waveguide

1998 ◽  
Author(s):  
Yuri H. Avetisyan ◽  
Khachatur V. Nerkararyan ◽  
Karen N. Kocharyan
Keyword(s):  
Optical Waveguide ◽  
Nonlinear Optical ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Frequency Generation

QUASI-PHASE-MATCHED DIFFERENCE-FREQUENCY GENERATION IN NONLINEAR OPTICAL POLYMER WAVEGUIDES

2004 ◽  
Vol 13 (03n04) ◽  
pp. 391-396 ◽  
Author(s):  
MYUNG-HYUN LEE ◽  
JUNG JIN JU ◽  
MIN-SU KIM ◽  
JUNG YUN DO ◽  
SEUNG KOO PARK ◽  
...  
Keyword(s):  
Communication Systems ◽  
Nonlinear Optical ◽  
Optical Fiber Communication ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Wavelength Converter ◽  
Polymer Waveguides ◽  
Periodically Poled ◽  
Chain Polymer ◽  
Frequency Generation

Nonlinear optical (NLO) polymer is emerging as a new alternative material for a wavelength converter in optical fiber communication systems. We designed and synthesized a polyetherimide-based side-chain polymer with a 4-(dialkylamino)-4′(-(styrylsulfonyl)-stilbene chromophore as a new NLO polymer. We designed and fabricated periodically-poled NLO polymer waveguides for the wavelength converter. Difference-frequency generation (DFG) process with a quasi-phase-matching (QPM) scheme was used. For the first time, we demonstrated a wavelength converter with a DFG conversion efficiency of -47 dB in the periodically-poled NLO polymer waveguides, operating at ~ 1.55 μm.

SPECTROSCOPIC INVESTIGATION OF SURFACES AND INTERFACES BY USING INFRARED-VISIBLE SUM AND DIFFERENCE FREQUENCY GENERATION

2000 ◽  
Vol 07 (04) ◽  
pp. 423-436 ◽  
Author(s):  
ABDERRAHMANE TADJEDDINE
Keyword(s):  
Spectroscopic Investigation ◽  
Nonlinear Optical ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Inversion Symmetry ◽  
Optical Techniques ◽  
Surfaces And Interfaces ◽  
Frequency Generation

The nonlinear optical techniques of visible-infrared sum (SFG) and difference (DFG) frequency generation are addressed as a vibrational probe of surfaces and interfaces between media of inversion symmetry.

scholarly journals Spectroscopic Imaging with an Ultra-Broadband (1–4 THz) Compact Terahertz Difference-Frequency Generation Source

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 336
Author(s):  
Atsushi Nakanishi ◽  
Shohei Hayashi ◽  
Hiroshi Satozono ◽  
Kazuue Fujita
Keyword(s):  
Imaging Technique ◽  
Spectroscopic Imaging ◽  
Difference Frequency Generation ◽  
Difference Frequency ◽  
Quality Monitoring ◽  
Terahertz Emission ◽  
Mid Infrared ◽  
Quantum Cascade ◽  
Frequency Generation ◽  
Multi Mode

We demonstrate spectroscopic imaging using a compact ultra-broadband terahertz semiconductor source with a high-power, mid-infrared quantum cascade laser. The electrically pumped monolithic source is based on intra-cavity difference-frequency generation and can be designed to achieve an ultra-broadband multi-mode terahertz emission spectrum extending from 1–4 THz without any external optical setup. Spectroscopic imaging was performed with three frequency bands, 2.0 THz, 2.5 THz and 3.0 THz, and as a result, this imaging technique clearly identified three different tablet components (polyethylene, D-histidine and DL-histidine). This method may be highly suitable for quality monitoring of pharmaceutical materials.

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