High-Power, Monolithic THz Sources via Difference Frequency Generation in Phase-Locked Arrays of Quantum Cascade Lasers

Period of Performance: 09/12/2016 - 09/11/2017


Phase 2 STTR

Recipient Firm

Intraband LLC
200 N. Prospect Ave. Array
Madison, WI 53726
Firm POC
Principal Investigator

Research Institution

University of Wisconsin, Madison
2100 Main Street
Madison, WI 53706
Institution POC


The technical objectives of this proposal are: 1) Fabricate and test ridge-guide, quantum-cascade-laser (QCL) devices employing a broad-gain-spectrum active-region design and suitable for incorporation in the designed high-index-contrast (HC) photonic-crystal (PC) THz, difference-frequency-generation (DFG) QCLs ; 2) Fabricate and test large-aperture HC-PC QCL devices suitable for THz generation via DFG in a single spatial mode at a wavelength of around 9 microns; 3) Design 3-4 THz-emitting devices for delivering 50 mW average power at room temperature (RT); 4) Demonstrate 3-4 THz-emitting devices delivering 50 mW average power at RT; and 4) Demonstrate 1.5 THz-emitting devices delivering over one mW of average power at RT. HC-PC QCLs of a built-in index step an order of magnitude higher than in conventional PC QCL devices will be fabricated, as to achieve stable-beam operation under quasi-CW operating conditions to watt-range coherent mid-infrared average powers, simultaneously at two different wavelengths.