JENOPTIK Laser, Optik, Systeme GmbH has developed for the first industrial all-solid-state Red-Green-Blue laser system for large image projection systems. Compact in design (0.75 m3, 180 kg, 3 kW power consumption), the system consists of a modelocked oscillator amplifier subsystem with 7 ps pulse duration and 85 MHz pulse repetition frequency, an optical parametric oscillator, and several non-linear stages to generate radiation at 628 nm, 532 nm and 446 nm with an average output power above 18 W. Each of the three colors is modulated with the video signal in a contrast ratio of 1000:1 and coupled into a common low order multi mode fiber. The system architecture relies on efficiently manufacturable components. With the help of FEM analysis, new engineering design principles and subsequent climatic and mechanical tests, a length stability below 50 micrometers and an angle stability below 10 (mu) rad have been achieved. The design includes efficient laser diodes with integrated thermo- electric cooler and a lifetime above 10000 hours. The stability of the output power is better than +/- 2% in a temperature range from 5 degree(s)C to 40 degree(s)C. The system operates reliably for more than 10000 hours under field conditions. The design is based (among others) on work by Laser-Display-Technologie KG and the University of Kaiserslautern.© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

RGB lasers for laser projection displays

Improvement on evaluating absorption efficiency of a medium rod for LD side-pumped solid-state lasers

Measurement of thermal diffractive losses in end-pumped solid-state lasers

We propose and demonstrate a new scheme for anamorphic
concentration of a big (40 cm × 40 cm) diffuse light source to
achieve an extremely high concentration in one lateral direction at the
expense of that in the other direction, to preserve the total
(two-dimensional) optical brightness. Such anamorphic
concentration is achieved by a combination of two conventional
two-dimensional concentrators and a properly designed retroreflector
array. Our experiments in search of a diffuse white-light source
with properties comparable with those of solar radiation have yielded
28-fold improvement of the one-dimensional concentration ratio compared
with those of conventional concentrators and 14-fold improvement
compared with the one-dimensional thermodynamic limit.

Anamorphic concentration of solar radiation beyond the one-dimensional thermodynamic limit

A record, 250W, CW output-power has been achieved for a single, 1cm-wide, 3.5mm cavity-length, 20% fill-factor,
976nm, laser-diode bar operated at 20°C. The remarkable laser-bar performance was in part the result of a novel
EPIC (Enhanced Performance Impingement Cooler) heat-sink with a thermal resistance of 0.16K/W. The superb
thermal management resulted in record brightness for a laser bar, i.e. a slow-axis divergence of 10° (95% power
containment angle) was achieved at 200W output-power. A coupling efficiency of ~74% into a 200μm core, 0.22NA
fiber was achieved.

Record CW-brightness from a single 20% fill-factor 1-cm laser-diode bar at 20°C

We developed a compact fiber-coupled high-power diode-laser unit with optical output power up to 40 W cw, coupled into a multimode fiber with 600 micrometers core diameter and NA 0.22. This diode-laser unit is suitable for pumping solid-sate or fiber lasers as well as for material processing. Essential part is a novel beam-shaping system with compact size, high flexibility and low alignment requirements, which uses a pair of micro step-mirrors. The whole unit fits into a housing of approximately 110 X 100 X 90 mm.

Compact fiber-coupled high-power diode laser unit

We have demonstrated efficient TEMoo operation of the Nd:YVO4 rod laser, one-end-pumped by a fiber-coupled diode laser. 11.6-W linearly polarized laser output with an optical efficiency of 54% in a TEMoo mode has been achieved.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Efficient TEM 00 operation of Nd:YVO 4 laser end pumped by fiber-coupled diode laser

A theoretical calculation of pump power deposition in a direct water-cooled Nd:YAG laser rod, side pumped by three diode laser bars is presented. The pumping cavity design provides a nearly uniform pump profile. More than 30-W cw output power with optical-to-optical efficiencies of more than 30% are obtained.

Neodymium:YAG 30-W cw Laser Side Pumped by Three Diode Laser Bars.

A detailed experimental investigation of the polarization characteristics of a diode laser side-pumped Nd:YAG laser has been performed. A Brewster plate inserted into the cavity resulted in a decrease of 50% of the output power that is due to depolarization. A thin-film polarizer (TFP) was introduced into the cavity and the depolarization loss served as the output coupling. By introduction of a quarter-wave plate (QWP) the output coupling rate and the beam shape were improved. An analytical expression for the output coupling rate of a cavity containing a TFP and a QWP has been derived. The experimental results are in good agreement with the simplified theoretical analysis.

Polarization characteristics of a Nd:YAG laser side pumped by diode laser bars

Nonlinear optical devices, such as harmonic generators, provide a means of extending the frequency range of available laser sources. In this paper we report on a novel concept for scaling the output power of frequency doubled Nd:YAG lasers. Conceptually, the laser consists of multi oscillators, which are placed in a common resonator. The frequency doubler is an etalon shaped nonlinear crystal with dichroitic coatings. The second harmonic generated in different oscillators is coaxially superpositioned.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Parallel diode-pumped frequency doubled Nd:YAG laser

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