8 of 9
The nominal peak power of the THz source is about 120
W with 10
sec pulse length.
The duty cycle of the pulsed AVTECH-1011 controller has been set to 10%, yielding an
average power of about 12
W. By considering the transmission value of 65% for the
quartz window and the refractive silicon float zone custom objective in front of the QCL,
the average output power may reach up to 8
W.
Custom THz Objective
Number of lenses
2
Lens material
HRFZ-Si
AR coating (thickness)
Parylene C (15
m)
Focal length
44 mm
F number
0.95
Aperture stop
External, fixed diameter
Object distance
30 cm to infinity
Dimension
= 80 mm; length = 60 mm
THz Source
Type
Quantum Cascade Laser
Peak power
120
W
Repetition rate
10 kHz
Duty cycle
10%
Average power
12 µW
Pulse duration
10
sec
Central wavelength
100
m
Table 1. Main Characteristics of Custom THz Objective and QCL THz Laser
