Dual-Frequency 780-nm Ti:Sa Laser for High Spectral Purity Tunable CW THz Generation

Author

Loas, Goulc´hen ; Romanelli, Marco ; Alouini, Mohamed-Slim

Author_Institution

Inst. de Phys. de Rennes, Univ. of Rennes1, Rennes, France

Volume

26

Issue

15

fYear

2014

fDate

Aug.1, 1 2014

Firstpage

1518

Lastpage

1521

Abstract

A two-axis, two-polarization, dual-frequency Ti:Sa laser optimized for high spectral purity CW-THz generation is demonstrated. The laser output power is 50 mW. Its mean emission wavelength is optimized ~780 nm in order to suit the maximum efficiency of low temperature grown GaAs photomixers. Despite the extremely wide gain bandwidth of Ti:Sa, a proper intracavity filtering design, adapted to this particular laser architecture, enables tunable and single-frequency operation of each laser mode. The resulting beatnote is shown to be tunable between dc and 1.5 THz by steps of 82 GHz. Its linewidth is narrower than 30 kHz without any active stabilization or cavity insolation.

Keywords

laser modes; laser tuning; microwave photonics; solid lasers; spectral line narrowing; terahertz wave generation; titanium compounds; Al₂O₃:Ti; CW THz generation; GaAs photomixers; beatnote; dual-frequency Ti:Sa laser; frequency 1.5 THz; high spectral purity; laser tuning; narrow linewidth; power 50 mW; wavelength 780 nm; Cavity resonators; Crystals; Laser excitation; Laser modes; Optical filters; Optical polarization; Pump lasers; Dual-frequency laser; solid-state lasers; terahertz; tunable;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2327656

Filename

6824771