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Active/passive mode-locked laser oscillator

Patent ·
OSTI ID:862816
 [1];  [2]
  1. Fremont, CA
  2. Palo Alto, CA
+ Show Author Affiliations

A Q-switched/mode-locked Nd:YAG laser oscillator employing simultaneous active (electro-optic) and passive (saturable absorber) loss modulation within the optical cavity is described. This "dual modulation" oscillator can produce transform-limited pulses of duration ranging from about 30 psec to about 5 nsec with greatly improved stability compared to other mode-locked systems. The pulses produced by this system lack intrapulse frequency or amplitude modulation, and hence are idealy suited for amplification to high energies and for other applications where well-defined pulses are required. Also, the pulses of this system have excellent interpulse characteristics, wherein the optical noise between the individual pulses of the pulse train has a power level well below the power of the peak pulse of the train.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
DOE Contract Number:
W-7405-ENG-48
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Number(s):
US 4019156
OSTI ID:
862816
Country of Publication:
United States
Language:
English

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/372/
30
absorber
active
amplification
amplitude
amplitude modulation
applications
below
cavity
characteristics
compared
described
dual
duration
electro-optic
employing
energies
excellent
frequency
greatly
greatly improved
hence
idealy
improved
improved stability
individual
interpulse
intrapulse
lack
laser
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level
loss
mode-locked
modulation
noise
nsec
optical
optical cavity
oscillator
passive
passive mode
peak
peak pulse
power
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produce
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psec
pulse
pulse characteristics
pulse frequency
pulse train
pulses
pulses produced
q-switched
ranging
required
saturable
saturable absorber
simultaneous
stability
suited
systems
train
transform-limited
well-defined
yag
yag laser