Title :
Flexible lock-in detection system based on synchronized computer plug-in boards applied in sensitive diode-laser gas spectroscopy
Author :
Andersson, Mats ; Persson, Linda ; Svensson, Tomas ; Cassel-Engquist, Mdrta ; Svanberg, Sune
Author_Institution :
Lund Univ., Lund
Abstract :
A flexible and compact digital lock-in detection system, with software-based balanced detection for tuneable diode-laser spectroscopy measurements is described. The system is based on two data acquisition cards for a standard computer. One data acquisition card contains a software-controlled arbitrary waveform generator (CH-3150, Exacq Technologies) that is used for laser modulation. A pigtailed single mode VCSEL laser (L2K-P760-LD-SM, Laser2000) is used to scan across oxygen lines at about 760 nm. After the laser, the light is split by a single-mode fiber splitter. The scanning frequency is typically 130 Hz and a sinusoidal modulation of about 132 kHz is applied.
Keywords :
data acquisition; measurement by laser beam; optical engineering computing; optical modulation; semiconductor lasers; spectrochemical analysis; surface emitting lasers; data acquisition cards; flexible lock-in detection system; laser modulation; pigtailed single mode VCSEL laser; sensitive diode-laser gas spectroscopy; single-mode fiber splitter; sinusoidal modulation; software-based balanced detection; software-controlled arbitrary waveform generator; synchronized computer plug-in boards; Data acquisition; Diodes; Fiber lasers; Frequency synchronization; Laser mode locking; Laser modes; Laser tuning; Signal generators; Spectroscopy; Tunable circuits and devices;
Conference_Titel :
Lasers and Electro-Optics, 2007 and the International Quantum Electronics Conference. CLEOE-IQEC 2007. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-0931-0
Electronic_ISBN :
978-1-4244-0931-0
DOI :
10.1109/CLEOE-IQEC.2007.4386379
