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2011-11-8  瀏覽量:9520
CEO Application Note #14 PowerPULSE Gain Modules

Northrop Grumman Cutting Edge Optronics
Application Note #14
PowerPULSE™ Gain Modules

Northrop Grumman Cutting Edge Optronics has developed a family of Quasi-CW pumped gain modules with output
energies is excess of 4 Joules and small signal gains of over 600. The PowerPULSE™ gain modules can be
configured with rod sizes from 2mm to 10mm and diode bar counts of 3 to 300.
Data from a selection of gain modules is presented in this application note. Included are expected pulse energy
outputs while operating in a free running oscillator. For amplifier applications, the total small signal gain and the
stored energy are also reported.
The PowerPULSE™ gain modules utilize reliable QCW laser diode bars packaged in Golden BulletTM arrays to
enable long product lifetimes. Quasi-CW pumped module lifetimes exceeding 10,000 hours and 20 billion shots are
available.
January 19, 2010

1. PowerPULSETM GAIN MODULES IN OSCILLATORS
PowerPULSE™ gain modules can be used in a variety of oscillator configurations. Operating the gain modules in a short, free
running oscillator gives a reasonable basis for comparison. Typical performance of a selection of modules is given in Table 1.
The RBA models cover the 20mJ to 400mJ output energy ranges while the REA series of gain modules allows output pulses
exceeding 4J.


Table 1. Free running oscillator energy, operating voltage, and drive
current for a selection of PowerPULSE™ models.
Several of the modules have been placed in q-switched resonators and their performance measured. An empirical relationship,
depending upon cavity design, pump parameters, and choice of output coupler, can be established between the free running
resonator energy and the q-switched resonator energy. This relationship can then be used to predict the output energy of the
PowerPULSE™ modules in q-switched resonators from the free running resonator energy output.
2. PowerPULSETM GAIN MODULES AS AMPLIFIERS
PowerPULSE™ gain modules are also ideally suited for use as laser amplifiers. Two important parameters for laser amplifier
design are small signal gain and stored energy. The small signal gain is a unitless number that indicates how much a small (well
below the saturation limit) signal will be amplified upon a single pass of the module. The stored energy indicates the amount of
energy that can extracted from the module given a sufficient number of passes or input signal saturation. Table 2 reports the
small signal gain and stored energy numbers for a selection of gain modules.
As a general rule, for a given pump power, smaller rods have larger small signal gains and larger rods can store more energy.
Consideration of depolarization (due to the stress induced on the rod) and gain uniformity (due to pump light distribution) also
play important roles in selecting the proper gain module for each application.

Table 2. Small signal gain and stored energy for a selection of PowerPULSE™ modules.
3. DEPOLARIZATION
Depolarization due to stress induced in the rod of the gain module is very important for oscillator and amplifier design. The
amount of depolarization is dependent on the heat dissipated by the rod, which is a function of the pump duty cycle. For a
fixed pump pulse width and drive current, the amount of depolarization can be calculated as a function of repetition rate.
Figure 1 shows the amount of total depolarization for a single pass of a typical gain module.

Figure 1. Depolarization as a function of repetition rate for
a REA10008-3P200 operating at 250?s, 130A.

Our Products

 

Laser Diode Arrays
CEO® offers a full line of conductively cooled, water cooled or microchannel cooled laser diodes and
stacks. Choose from our wide range of standard product offerings including Golden Bullet arrays for
long pulse (>500 ?s) applications. Wavelengths from 780 – 1550 nm are available.

 

CW Pumped Laser Modules
Our range of diode modules are an ideal 'pump engine' solution for OEM manufacturers of Diode
Pumped Solid State (DPSS) lasers. They are available with a variety of gain media options (Nd:YAG,
Nd:YLF, Nd:YVO4 etc.). Output powers ranging from 20 W (TEMoo) to 800 W (multi mode) are
available.

 

QCW Pumped Laser Modules
For high energy pulsed laser applications, CEO offers the PowerPULSE family of modules to deliver
output energies up to 4 J per pulse and small signal gain in excess of 600. CTE matched, 'hard solder'
laser diode packaging technology ensures long operating lifetimes.

 

Electronics & Support Equipment
Choose from CEO’s complete line of proven and versatile OEM high powered diode drivers and laser
system controllers along with all the support equipment needed to operate high power CW and QCW
pump modules or other diode-based laser systems.

 

Industrial Laser Systems
CEO offers industrial laser systems for micro-machining, marking, cutting, drilling, welding,
soldering, and other industrial uses. These lasers utilize long-life diode pump sources to enable long
laser lifetimes. Custom lasers can be built to a wide range of specifications.

 

Military & Custom Lasers
CEO® offers complete custom laser design engineering and manufacturing services of diode pumped
solid state lasers (DPSS), laser diode arrays and modules for military, aerospace and industrial OEM
laser applications. CEO specializes in engineering systems that are required to operate in harsh rugged
environments including military & civilian helicopters, fixed wing aircraft, ground vehicles, and
submerged towed bodies.

Contact Us
Telephone: 636.916.4900
Fax: 636.916.4994
st-ceolaser-info@ngc.com
20 Point West Boulevard, St. Charles, MO (USA), 63301
http://www.as.northropgrumman.com/businessventures/ceolaser/index.html

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