Tunable Semiconductor Laser TSL- 710
8-1
Operating Principles
8
This device consists of an external cavity laser, optical attenuator, optical power
monitor, Wavelength monitor and an electronic control circuit. As shown in Fig.2, the
external cavity laser consists of a laser diode (LD), diffraction grating and a mirror. By
changing the angle of the mirror, the lasing wavelength can be tuned. By optimally
configuring these components a lasing cavity structure is created and while tuning
the wavelength, mode-hop is reduced to virtually zero.
In order to ensure a constantly stable oscillation state, the LD is maintained at a
uniform temperature. Feed back signals from the optical power monitor to the optical
attenuator and a regulated electrical current for the LD, controls and stabilizes the
optical output power (during Auto mode).
TSL-710 block diagram
Principle of external cavity laser
Optical
attenuator
External
cavity
laser
Wavelength
monitor
Optical
power
monitor
Wavelength control
Temperature control
Electric current control
Optical output control
GP-IB
RS-232C
USB
Trigger signal
Control Circuit
Mirror
Diffraction grating
Lens
AR coat
Isolator
LD
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