Speckle noise reduction on a laser projection display via a broadband green light source.

A broadband green light source was demonstrated using a tandem-poled lithium niobate (TPLN) crystal. The measured wavelength and temperature bandwidth were 6.5 nm and 100 °C, respectively, spectral bandwidth was 36 times broader than the periodically poled case. Although the conversion efficiency was smaller than in the periodic case, the TPLN device had a good figure of merit owing to the extremely large bandwidth for wavelength and temperature. The developed broadband green light source exhibited speckle noise approximately one-seventh of that in the conventional approach for a laser projection display.

[1]  T. Tschudi,et al.  Speckle reduction in laser projection systems by diffractive optical elements. , 1998, Applied optics.

[2]  Shigeo Kubota,et al.  Very efficient speckle contrast reduction realized by moving diffuser device. , 2010, Applied optics.

[3]  Bedros Afeyan,et al.  Tandem chirped quasi-phase-matching grating optical parametric amplifier design for simultaneous group delay and gain control. , 2005, Optics letters.

[4]  Kangin Lee,et al.  A Compact Diode-Pumped Microchip Green Light Source with a Built-in Thermoelectric Element , 2008 .

[5]  Hugo Thienpont,et al.  Standardized speckle measurement method matched to human speckle perception in laser projection systems. , 2012, Optics express.

[6]  Shenping Li,et al.  Multiple-wavelength synthetic green laser source for speckle reduction , 2011, LASE.

[7]  A. Tehranchi,et al.  Design of Novel Unapodized and Apodized Step-Chirped Quasi-Phase Matched Gratings for Broadband Frequency Converters Based on Second-Harmonic Generation , 2008, Journal of Lightwave Technology.

[8]  D. Ko,et al.  A linearly-polarized Nd:YVO4/KTP microchip green laser. , 2009, Optics express.

[9]  Role of apodization in optical parametric amplifiers based on aperiodic quasi-phasematching gratings. , 2012, Optics express.

[10]  K. Mizuuchi,et al.  Broadening of the phase-matching bandwidth in quasi-phase-matched second-harmonic generation , 1994 .

[11]  Victor Yurlov,et al.  Speckle suppression in scanning laser display. , 2008, Applied optics.

[12]  Toshiaki Suhara,et al.  Theoretical analysis of waveguide second-harmonic generation phase matched with uniform and chirped gratings , 1990 .

[13]  Takashi Miyoshi,et al.  510–515 nm InGaN-Based Green Laser Diodes on c-Plane GaN Substrate , 2009 .

[14]  Hiroyuki Furuya,et al.  L-9: Late-News Paper: Laser Projection Display with Low Electric Consumption and Wide Color Gamut by Using Efficient Green SHG Laser and New Illumination Optics , 2006 .

[16]  Hirokazu Furue,et al.  Control of Laser Speckle Noise Using Liquid Crystals , 2011 .

[17]  Takashi Kondo,et al.  Absolute scale of second-order nonlinear-optical coefficients , 1997 .

[18]  Broad multiwavelength second-harmonic generation from two-dimensional /spl chi//sup (2)/ nonlinear photonic crystals of tetragonal lattice structure , 2004, IEEE Journal of Selected Topics in Quantum Electronics.