Laser Zentrum Hannover in the USA
01/15/2013

The LZH is presenting innovative laser technology at Photonics West 2013 (stand photo from Photonics West 2012)

From February 2nd to 7th, the laser experts from the LZH will be presenting recent developments at the scientific exhibition Photonics West in San Francisco, California.

The market in the US is considered to be one of the most important export markets for optical technology projects from Germany. Thus, Photonics West is also the most important North American scientific exhibition for the Laser Zentrum Hannover e.V. (LZH). Photonics West is also a global meeting point for scientists and industry in the optical and photonics branches. The LZH will be presenting exhibitis mainly from the fields of optical fibers and fiber amplifiers to the 20,000 guests expected to attend the fair.
 
Brilliant, efficient, stabile
When highest laser quality coupled with extraordinary stability and resilience is needed, then compact and efficient fiber amplified systems offer great advantages, compared to solid-state lasers. Together with the Albert Einstein Institute in Hannover (AEI), the LZH has developed a prototype of a single frequency, highly integrated fiber amplifier system with a 1 µm wavelength. It has a brilliant beam quality with output powers of nearly 300W at a spectral laser line width of ~ 1 kHz. It is a robust, high power system, especially suitable for the extremely sensitive detection of gravitational waves, or for investigations on quantum optical phenomena, or for non-linear frequency conversion (SHG, OPO) and laser-based metrology.
 
The core of the fiber amplifier system is a high-power pump light coupler developed at the LZH for the wavelength range around 1 µm. The coupler can be used to achieve high output powers that can be integrated into fibers, and it is being presented along with further fiber components and other exhibits. The pump light coupler has up to 6 fiber connections, each of which can be connected to a 100 W fiber-coupled pump diode. By using side coupling of the pump light, the signal core of the fiber is not affected during manufacturing. Thus, in amplifier systems, the fiber coupler is especially suitable for optical pumping opposite the signal direction.
 
Pocket-size, ultrashort pulsed fiber lasers
Further improvements have been made on a completely fiber-based, ultrashort pulsed thulium oscillator with an emission wavelength around 1.98 µm, which was presented for the first time last year in the USA. The seed laser for the downstream fiber amplifier does not require readjustment, and it provides high stability of both wavelength and output. Furhtermore, the oscillator is equipped with polarization maintaining fibers, making it more stabile when subject to temperature fluctuations and other external influences.
By simply changing the Faser-Bragg gratings, the central wavelength can be adjusted, or the pulse length can be independently changed. Currently, the LZH is working on developing a central wavelength which can be tuned in operation, without having to change the fiber Bragg grating. With this unit, the laser, which has mainly been used for micromachining of plastics, could also be used for spectroscopic applications.
 
Small but robust
Due to popular demand at the Photonics West last year, the light weight (35 g) but very robust LIBS laser head will again be present at the fair in San Francisco this year. This system uses laser-induced plasma spectroscopy for material analysis under extreme conditions. The LIBS laser has a 1053 nm wavelength, a pulse energy > 1 mJ and pulse repetition rates < 50 Hz. With a pulse length of 2 ns, beam qualities of (M²) < 1.3 can be reached.
The LZH is presenting their exhibits at the 418 m² German Pavillon (North Hall, Stand Nr. 4601).
Press release for download: 
Business Development & Communications Department
Communications Group
Michael Botts
Public Relations
Tel.: +49 511 2788-151
Fax: +49 511 2788-100
E-Mail: m.botts@lzh.de

The Laser Zentrum Hannover e.V. (LZH) carries out research and development in the field of laser technology and is supported by the Ministry of Economic Affairs, Labour and Transport of the State of Lower Saxony (Niedersächsisches Ministerium für Wirtschaft, Arbeit und Verkehr).