IPG Photonics Successfully Tests World's First 10 Kilowatt Single-Mode Production Laser

World's Brightest Commercial Solid State Laser Enables New Applications

Munich, Germany, June 16, 2009 -- IPG Photonics Corporation, a pioneer
and global leader in high-power fiber lasers and amplifiers, announced
today the successful test of its new ten kilowatt single-mode fiber
laser, a world record in a production laser. The unique laser produces
9.6 kilowatts of single-mode power through a single fiber at total
efficiency exceeding 23%. IPG's new kilowatt laser has multiple
applications including remote cutting and welding as well as directed
energy.

Representing the latest development in the power scaling of IPG
Photonics' patented high-power single-mode fiber laser technology, the
laser's optical scheme consists of a fully-integrated MOPA (master
oscillator power amplifier) with an output delivery fiber four meters
long directly spliced into the power amplifier. The Company's ten
kilowatt single-mode laser, the YLS-10000-SM, will be the world's
brightest industrial CW solid state laser, given the combination of
output power and virtually perfect Gaussian beam-quality at 1070 nm
emission wavelength. Developed by its subsidiary IPG Laser GmbH, the
YLS-10000-SM is a turn-key package that offers a small footprint and
record efficiency wall-plug.

"The ten kilowatt fiber laser builds on our prior success with the five
kilowatt single-mode lasers we introduced earlier this year" stated Dr.
Valentin Gapontsev, Chief Executive Officer of IPG Photonics and an
inventor of the new laser. "However, we designed a new state-of-the-art
power amplifier to overcome thermal limitations, avoid higher order
modes and non-linear effects, despite the enormous power density at this
output level" he added.

"Industrial customers can now use fiber lasers for applications which
were not previously possible with other lasers, such as remote cutting
and welding without expensive assist gases in the infrastructure,
automotive, aerospace and shipbuilding industries" said Bill Shiner,
Vice President of Industrial Markets. "Mobile applications such as
bridge construction and repair and ship and airplane paint removal can
now take advantage of higher output powers in a mobile and robust laser
package to increase the distance to the work piece."

This industrial product also has applications in tactical directed
energy markets. The combination of ten kilowatts of output power with
near-perfect beam quality and the inherent reliability, efficiency and
ruggedness of a fiber laser in a compact package is a compelling
solution for a variety of tactical directed energy applications.

IPG is taking orders for the YLS-10000-SM. Visit IPG at World of
Photonics, Munich, Germany, June 15-18, Booth #370, Hall H2 for more
information.

About IPG Photonics Corporation
IPG Photonics Corporation is the world leader in high-power fiber lasers
and amplifiers. Founded in 1990, IPG pioneered the development and
commercialization of optical fiber-based lasers for use in a wide range
of applications such as materials processing, advanced applications,
telecommunications and medical applications. Fiber lasers have
revolutionized the industry by delivering superior performance,
reliability and usability at a lower total cost of ownership compared
with conventional lasers, allowing end users to increase productivity
and decrease operating costs. IPG has its headquarters in Oxford,
Massachusetts, and has additional plants and offices throughout the
world. For more information, please visit www.ipgphotonics.com.

Safe Harbor Statement
Information and statements provided by the Company and its employees,
including statements in this press release, that relate to future plans,
events or performance are forward-looking statements. These statements
involve risks and uncertainties. Any statements in this press release
that are not statements of historical fact are forward-looking
statements. Factors that could cause actual results to differ materially
include risks and uncertainties, including risks associated with finding
new applications and markets for its multi-kilowatt single mode lasers,
enabling new applications and providing solutions for different
applications. Readers are encouraged to refer to the risk factors
described in the Company's Annual Report on Form 10-K (filed with the
SEC on March 12, 2009) and its periodic reports filed with the SEC, as
applicable. Actual results, events and performance may differ
materially. Readers are cautioned not to rely on the forward-looking
statements, which speak only as of the date hereof. The Company
undertakes no obligation to update the forward-looking statements that
may be made to reflect events or circumstances after the date hereof or
to reflect the occurrence of unanticipated events.

CONTACT:
Bill Shiner
Vice President-Industrial Markets
IPG Photonics Corporation
(508) 373-1100
[email protected]

Michael O'Connor
Director of Advanced Applications
IPG Photonics Corporation
(508) 373-1271
[email protected]