Guang Zheng

Laser Digital Cinema Projector

The reason for wider color gamut of laser display systems rests on RGB laser lights whose color coordinates very approach the locus of gamut chart, which means the most saturated colors. A novel, practical and simplest method to reduce the laser speckle is developed. A laser digital cinema projector (LDCP) is manufactured for the first time in the world. The LDCP enjoys all benefits of 166% NTSC expanded color gamut, beyond 9 024 ANSI lumens light output, a minimum sequential contrast ratio of 2595:1, 2048 X 1080 display resolution, etc.

A 30,000 lm Laser Digital Cinema Projector

Based on the latest RGB lasers, a Laser Digital Cinema Projector (LDCP) with 30,000lm light output is manufactured. The reason why LDCP has the property of low power consumption is explained.

A highly efficient 3.2 μm optical parametric oscillator pumped by a passively Q-switched Nd:YVO4 laser

We describe a compact all-solid-state singly resonant optical parametric oscillator (SRO) based on a Cr4+: YAG Q-switched Nd:YVO4 laser. The SRO is based on periodically poled MgO:LiNbO3 (PPMgLN) as the nonlinear material. By exploiting a 35 mm PPMgLN crystal, we achieved the SRO operation threshold at a pump power of only 140 mW. At 1.78 W of pump laser with a pulse width of 10 ns and a repetition of 50 kHz, 360 mW average power at 3.2 μm and a mid-infrared conversion efficiency of 20% were achieved.

Intracavity continuous-wave optical parametric oscillator tuning from 1.9μm to 2.4μm

We described a widely tunable intracavity continuous-wave singly resonant optical parametric oscillator (SRO) through a minimal laser diode end-pumped Nd:YVO4 laser. Laser source from 1.9μm to 2.4μm is obtained by temperature tuning of the 32.2μm period periodically poled MgO:LiNbO3(PPMgLN) crystal. The maximum power, 0.84W signal wave at 1.966μm and 0.56W idler wave at 2.319μm, are simultaneously obtained at 5.5 W of input diode power. The corresponding conversion efficiency are 15.2% and 10.2% respectively, so the whole efficiency is more than 25%. This allows the development of practical infrared cw SRO’s using compact, widely available, low-cost laser pump sources.

Comparison and simulation of two resolve plane algorithms in the strapdown fiber-optic gyro multi-positions north seeking

For the multi-position north seeking by strapdown fiber-optic gyro, the algorithms of coordinate transform and vector were conducted, the mistakes of vector resolve plane algorithm formula in the reference [7] were corrected. By comparing the north seeking accuracies of two algorithm formulas in different forms, the simulation result approved the resolve plane algorithms.

High power and efficient continuous wave 456 nm blue laser for laser display

With low Nd doped Nd:GdVO4 and LBO intracavity frequency doubled, a high power and efficient continuous wave 456 nm blue laser is developed, as the pump power of 35 W, 7.6 W output power is achieved.

Embedded speckle measurement instrument design and quantified speckle evaluation of a 71 inch laser TV

Speckle effect of laser display equipment should be evaluated by objective measurement. An embedded speckle measurement instrument based on linear CCD was designed for the quantified evaluation of the 71 inch laser TV. Comparing the result measured by the instrument based on the linear device with that based on planar device, the agreement was concluded. Analyzing the change of quantified result, the effect of the speckle removal unit is characterized.

Application of auto white balance control in Giant screen splicing laser projection system

Chromatic uniformity is a key indicator of splicing projection system. The splicing laser projection system is reported which consist of five splicing subsystems. The total projection area covers 100 square meters and the system has total flux output of 750001m. The fluctuation of luminance is 2% and chromaticity drift √Δx² + Δy² = 0.002 with the auto white balance controller we designed.

45,000 Lumens super high brightness laser projection system

A super high brightness laser projector is first shown, with steady output reaching up to 45,000 lumens. A highly flexible structure with remote light source and separated water-cooling system is employed for use in harsh application environment.

Blue light generation by intra-cavity frequency-doubling with a PPMgLN

We have obtained a 4.2μm periodically domain inverted structure in a MgO:LiNbO<inf>3</inf> crystal, and developed a compact blue laser with the MgO doped periodically poled LiNbO<inf>3</inf>(PPMgLN). 240mW at 456nm was generated by intra-cavity frequency-doubling.