laser threshold

laser threshold

[′lā·zər ¦thresh·hōld]
(electronics)
The minimum pumping energy required to initiate lasing action in a laser.
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After introducing the SESAM in the cavity, laser threshold was significantly increased due to the absorption loss of SESAM.
The best specimen emits an optical power of about 10 mW/facet continuous wave at room temperature and at a pump current of 20% above the laser threshold current [I.sub.th].
The laser threshold currents were almost constant and it is vary from 1.2 mA to 1.7 mA at temperature from T=15C to 40C, respectively.
In the whole pump power range from laser threshold to the maximum pump power, we did not observe the self-pulsed phenomenon.
It is find in a multichannel system when a laser outputs nearly zero power as the input signal current to the laser drives below the laser threshold current [I.sub.th] (Fig.1), [2].