Abstract:
Abstract
We analyse the use of a tunable dual wavelength Y-branch DBR laser diode for THz
applications. The laser generates electrically tunable THz difference frequencies in the
range between 100 and 300 GHz. The optical beats are tuned via current injection into a
micro-resistor heater integrated on top of one of the distributed Bragg reflector (DBR)
section of the diode. The laser is integrated in a homodyne THz system employing fiber
coupled ion-implanted LT-GaAs log spiral antennas. The applicability of the developed
system in THz spectroscopy is demonstrated by evaluating the spectral resonances of a
THz filter as well as in THz metrology in thickness determination of a polyethylene
sample.
Keywords Semiconductor laser. CW THz source . Homodyne detection
