JED - December 2013 - 27

The Journal of Electronic Defense | December 2013

27

substantially more light sensitive than
PIN diodes of a comparably-sized area.
Excelitas Technologies (VaudreuilDorion, Quebec), is a supplier of both
off-the-shelf and customer-specific laser
sensors designed into laser warning systems in use with militaries around the
globe including the US. Eric Desfonds,
Excelitas Senior Application Engineer for
High Performance Sensors and Defense,
points out that, although they also do a
lot of work with avalanche photodiodes
(APDs) and phototransistors, "it's often a
challenge to use the technology for laser
warning systems because of the large
amount of light that is usually reaching
a target."
"Most of our customers use PINs, which
do not have built-in gain, and as such,
are less sensitive to sunlight and very
high energy light pulses," Desfonds says.

In general, the range of laser wavelengths of interest on the battlefield is
typically between 0.4 - 1.8 μm, although
other types of battlefied lasers operating outside this range are also present.
ISR's Gephart explains, as you get into
lasers outside of this general range, however, the cost of fielding the technology
becomes a major factor. Still, he says,
"We're always working with our customers to learn of any new emerging threats
they may be interested in."
Excelitas' photodetection sensors are
built using silicon and/or InGaAs materials to meet a variety of size, sensitivity
and speed requirements. It operates its
own fully-integrated production process including foundry, assembly, test
and finishing facility. Its High Angular

Resolution Laser Irradiance Detector
(HARLID) products are used in laser
warning systems onboard ground vehicles, naval vessels, fixed and rotary wing
aircraft, as well as carried by individual
soldiers, to detect laser rangefinders and
target designators.
Manufactured using fully-automated
robotic technology, the HARLID-362 module combines 9-element Silicon and InGaAs
PIN detector arrays for a spectral sensitivity range of 0.5 - 1.65 μm, together with
6-bit digital encoding for precise AOA
(±0.7 degree accuracy in either azimuth or
elevation.) As described by Desfonds, the
AOA accuracy of the HARLID is a critical
parameter, noting that while a helicopter may respond to laser-illumination by
releasing flares which need only be fired



JED - December 2013

Table of Contents for the Digital Edition of JED - December 2013

The View From Here
Conferences Calendar
Courses Calendar
From the President
The Monitor
World Report
Seeing the Light: Laser Warning Systems Facing Increasingly Lethal Threats
2014 EW/SIGINT Resource Guide
EW 101
AOC News
Index of Advertisers
JED Quick Look
JED - December 2013 - cover1
JED - December 2013 - cover2
JED - December 2013 - 3
JED - December 2013 - 4
JED - December 2013 - 5
JED - December 2013 - The View From Here
JED - December 2013 - 7
JED - December 2013 - Conferences Calendar
JED - December 2013 - 9
JED - December 2013 - Courses Calendar
JED - December 2013 - 11
JED - December 2013 - From the President
JED - December 2013 - 13
JED - December 2013 - 14
JED - December 2013 - The Monitor
JED - December 2013 - 16
JED - December 2013 - 17
JED - December 2013 - 18
JED - December 2013 - 19
JED - December 2013 - 20
JED - December 2013 - 21
JED - December 2013 - 22
JED - December 2013 - 23
JED - December 2013 - World Report
JED - December 2013 - 25
JED - December 2013 - Seeing the Light: Laser Warning Systems Facing Increasingly Lethal Threats
JED - December 2013 - 27
JED - December 2013 - 28
JED - December 2013 - 29
JED - December 2013 - 30
JED - December 2013 - 31
JED - December 2013 - 32
JED - December 2013 - 2014 EW/SIGINT Resource Guide
JED - December 2013 - 34
JED - December 2013 - 35
JED - December 2013 - 36
JED - December 2013 - 37
JED - December 2013 - 38
JED - December 2013 - 39
JED - December 2013 - 40
JED - December 2013 - 41
JED - December 2013 - 42
JED - December 2013 - 43
JED - December 2013 - 44
JED - December 2013 - 45
JED - December 2013 - 46
JED - December 2013 - 47
JED - December 2013 - 48
JED - December 2013 - 49
JED - December 2013 - EW 101
JED - December 2013 - 51
JED - December 2013 - 52
JED - December 2013 - 53
JED - December 2013 - AOC News
JED - December 2013 - 55
JED - December 2013 - 56
JED - December 2013 - Index of Advertisers
JED - December 2013 - JED Quick Look
JED - December 2013 - cover3
JED - December 2013 - cover4
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