skip to main content

SciTech ConnectSciTech Connect

Title: Terahertz source at 9.4 THz based on a dual-wavelength infrared laser and quasi-phase matching in organic crystals OH1

We present a compact, room temperature, and narrowband terahertz source, based on difference-frequency generation in the organic nonlinear optical crystals OH1 (2-[3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene]malononitrile). The system employs a specific dual-wavelength infrared laser that emits coaxial, synchronous 10-ns pulses of similar energy and duration at wavelengths of 1064 nm and 1030 nm by using Nd:YAG and Yb:YAG crystals within the split laser cavity. The common part of the laser cavity comprises an acousto-optic Q-switch and an output coupler. The output is frequency-mixed in a stack of several OH1 crystals in a quasi-phase-matching configuration, which is determined on the basis of refractive index and absorption measurements in the 1–11 THz range. The system generates terahertz radiation in pulse trains with 1.0 μW average power and a near-Gaussian intensity profile.
Authors:
;  [1] ;  [2] ;  [1] ; ; ; ;  [3]
  1. Jozef Stefan Institute, Jamova 39, 1000 Ljubljana (Slovenia)
  2. (Slovenia)
  3. Rainbow Photonics AG, Farbhofstrasse 21, CH-8048 Zurich (Switzerland)
Publication Date:
OSTI Identifier:
22351124
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION; CONFIGURATION; CRYSTALS; EMISSION; LASER CAVITIES; LASER MATERIALS; NEODYMIUM LASERS; NONLINEAR PROBLEMS; PULSES; Q-SWITCHING; REFRACTIVE INDEX; SWITCHES; TEMPERATURE RANGE 0273-0400 K; THZ RANGE; WAVELENGTHS