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Publication
Featured researches published by Dicky Lee.
Proceedings of SPIE | 2001
Eric B. Takeuchi; Graham W. Flint; Robert A. Bergstedt; Paul J. Solone; Dicky Lee; Peter F. Moulton
Electronic cinema projectors are being developed that use a digital micromirror device (DMDTM) to produce the image. Photera Technologies has developed a new architecture that produces truly digital imagery using discrete pulse trains of red, green, and blue light in combination with a DMDTM where in the number of pulses that are delivered to the screen during a given frame can be defined in a purely digital fashion. To achieve this, a pulsed RGB laser technology pioneered by Q-Peak is combined with a novel projection architecture that we refer to as Laser Digital CameraTM. This architecture provides imagery wherein, during the time interval of each frame, individual pixels on the screen receive between zero and 255 discrete pulses of each color; a circumstance which yields 24-bit color. Greater color depth, or increased frame rate is achievable by increasing the pulse rate of the laser. Additionally, in the context of multi-screen theaters, a similar architecture permits our synchronously pulsed RGB source to simultaneously power three screens in a color sequential manner; thereby providing an efficient use of photons, together with the simplifications which derive from using a single DMDTM chip in each projector.
Advanced Solid State Lasers (2000), paper MA9 | 2000
Kevin J. Snell; Dicky Lee; Kevin F. Wall; Peter F. Moulton
Using a side-pumped, Nd:YLF slab laser design, we have obtained a TEM00- mode output power of 25.7 W with 43.5% optical efficiency and a multimode output of nearly 36 W with 46% efficiency. As an amplifier of a SESAM-mode-locked laser, the same design has allowed us to generate, with 4.5-ps pulses at a 100-MHz rate, 15.7 W of average power in the fundamental and 2.9 W of power at the fourth harmonic.
Proceedings of SPIE | 2001
Dicky Lee; Peter F. Moulton; Robert A. Bergstedt; Graham W. Flint
In this paper we discuss our red, green, and blue (RGB) optical parametric oscillator (OPO) based laser projection display. The complete project display consists of two subsystems, the RGB-OPO laser head and the light modulation unit. The RGB lights from rack-mounted laser head are fibers coupled to the projection unit for independent placement. The light source consists of a diode-pumped pump laser and a LBO-based OPO. Based on our Nd:YLF gain module design, the pump laser is frequency doubled to serve as the pump source for the OPO. The unconverted pump power is recycled as the green light for projection. The singly resonant, non- critically phase-matched (NCPM) OPO has, to date, generated 13 W of 898-nm signal power and an estimated 9.3 W of intra- cavity idler power at 1256 nm. With approximately 76% of pump depletion, the power of the residual green light for projection is about 5.8 W. We have extra-cavity doubled the signal to produce approximately 3.5 W of 449-nm blue light and intra-cavity doubled the idler to produce approximately 6 W of 628-nm red light. The OPO-based RGB source generates about 4000 lumens of D65-balanced white light. The overall electrical power on a commercially available JVCs three- panel D-ILA (reflective LCD) projector with the arc-lamp removed and extensive modifications. The projector has a native resolution of 1365 x 1024 and the expected on screen lumens from our laser display is about 1200 lumens.
conference on lasers and electro optics | 2001
Dicky Lee; Peter F. Moulton
Summary form only given. We are developing a red-green-blue (RGB) laser-based source for projection display systems. Our design concept is to employ a high-pulse-rate, frequency-doubled Nd-doped solid state laser as the pump for a near infrared optical parametric oscillator (OPO). The OPO provides output at signal and idler wavelengths in the 900- and 1250-nm wavelength regions, respectively, which are doubled to provide blue and red wavelengths ideally suited for projection systems. The unused pump power provides the green wavelength. In this paper we report the latest results in scaling up the power of our RGB OPO to the multi-Watt level.
Proceedings of SPIE | 2001
Dicky Lee; Peter F. Moulton
In this paper we discuss our red, green, and blue (RGB) optical parametric oscillator (OPO) light source for projection display applications. Our source consists of a diode-pumped pump laser and a LBO-based OPO. Based on our Nd:YLF gain-module design, the pump laser is frequency doubled to serve as the pump source for the OPO. The unconverted pump power is recycled as the green light for projection. The singly resonant, non-critically phase- matched OPO has, to date, generated 13 W of 898-nm signal power and an estimated 9.3 W of intra-cavity idler power at 1256 nm. With approximately 76% of pump depletion, the power of the residual green light for projection is about 5.8 W. We have extra-cavity doubled the signal to produce approximately 3.5 W of 449-nm blue light and intra-cavity doubled the idler to produce approximately 6 W of 628-nm red light. The OPO-based RGB source generates about 4000 lumens of D65-balanced white light. The overall electrical power luminous efficiency (diodes only) is about 14.6 lumens/Watt.
conference on lasers and electro optics | 1999
Kevin J. Snell; Dicky Lee; Jeffery G. Manni
Greater than 50 W average power at a 50 kHz repetition rate has been obtained in a Q-switched, diode-pumped Nd:YVO/sub 4/ master oscillator/power amplifier (MOPA) system operating at 1064 nm and greater than 23 W average power operating at 1342 nm with near-diffraction limited beam quality.
conference on lasers and electro optics | 2000
K.I. Snell; Dicky Lee; Kevin F. Wall
Summary form only given. Increasingly many applications require a high-average power laser source with high peak power and brightness for efficient frequency conversion to UV and other wavelengths. In practice end-pumped systems offer high brightness and high efficiency but scaling to high average power is difficult, whereas side-pumped lasers offer greater power capability with less complexity than end-pumped designs, at the expense of efficient fundamental mode extraction efficiency. We present a simple, side-pumped slab laser design using Nd:YLF for low thermal lensing and high energy storage, which has high TEM/sub 00/-mode extraction efficiency.
electronic imaging | 1999
Kevin J. Snell; Dicky Lee; Bhabana Pati; Peter F. Moulton
A compact and efficient laser source is required as an enabling technology for laser projection displays. We discuss a scalable green-pumped, non-critically phase- matched LBO optical parametric oscillator (OPO) which simultaneously generates red and blue wavelengths that are ideal for display applications. Pumping the OPO with 9.7 W of 523 nm green light from a frequency-doubled, diode-pumped Nd:YLF oscillator/amplifier laser system has resulted in a measured 4.0 W of 896 nm signal power and an estimated idler power of 2.8 W. The signal was extra-cavity frequency doubled to produce 1.10 W of blue light at 448 nm. Intra- cavity frequency doubling of the idler produced 1.95 W of red light at 628 nm.
conference on lasers and electro optics | 2000
Yelena Isyanova; Dicky Lee; Bhabana Pati; Peter F. Moulton
Summary form only given. We previously reported a high-conversion-efficiency, tandem KTA-CdSe OPO source capable of covering four bands in the spectral range from 1.5 to 10 /spl mu/m. The design uses the angle-tuned, idler output of a KTA OPO to pump a non-critically phase-matched (NCPM) CdSe OPO. We use two techniques to increase the KTA OPO efficiency (1) difference-frequency generation (DFG) in a second KTA crystal placed in the KTA OPO cavity, and (2) injection-seeding of single frequency radiation at the signal wavelength into the KTA OPO cavity. We also demonstrate a tandem OPO pumped by a CW-diode-pumped, Q-switched, 4-kHz-repetition-rate, Nd:YLF laser.
Archive | 2002
Peter F. Moulton; Kevin J. Snell; Dicky Lee; Kevin F. Wall; Robert A. Bergstedt