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ABSTRACT: We present simultaneous efficient second- (SHG) and third-harmonic generation (THG) in a single periodically-poled KTP waveguided crystal pumped by a compact femtosecond Yb-based laser in a condition of exactly phase-matched frequency doubling and nonphase-matched sum-frequency mixing processes. Internal conversion efficiency as high as 33% for SHG (532 nm ) and ∼2% for the cascaded THG (355 nm ) is reported. We believe this to be a clear experimental demonstration that strong third-harmonic can be generated in frequency doubling crystals through a nonphase-matched sum-frequency mixing process.
Applied Physics Letters 04/2006; · 3.84 Impact Factor
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ABSTRACT: We describe a robust heralded single photon source based on parametric down conversion
of CW 532-nm light in a periodically polled KTP waveguide. Low required pump power (sub-mW),
reasonable operational temperature (43oC), high heralding efficiency (60%), and narrow spectral
width of the heralded photons (sub-nm) make it an ideal light source for long-distance quantum
communications.© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
05/2005;
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B. Agate,
E.U. Rafailov,
W. Sibbett,
S.M. Saltiel,
K. Koynov,
M. Tiihonen,
Shunhua Wang,
F. Laurell, P. Battle,
T. Fry,
T. Roberts,
E. Noonan
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ABSTRACT: We demonstrate an effective means of achieving compact, truly portable, and entirely self-contained ultrafast blue light sources. Using a variety of nonlinear media to achieve simple second-harmonic generation of a femtosecond Cr:LiSAF laser, we investigate the relative merits of aperiodically poled bulk and waveguide nonlinear crystals in comparison to periodically poled structures. Such a compact and convenient source of ultrashort laser pulses in the blue spectral region could be of great interest for on-site applications spanning a host of disciplines, such as biomedical imaging, optical micromanipulation, and high-resolution spectroscopy.
IEEE Journal of Selected Topics in Quantum Electronics 12/2004; · 3.78 Impact Factor
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ABSTRACT: We present a simplified, potentially portable, and highly efficient blue-light source from a periodically poled KTP waveguide crystal with a compact femtosecond Cr:LiSAF laser. This light source generates 5.6 mW of blue average output power at 424 nm with 27 mW of incident fundamental in a single-pass extracavity arrangement at room temperature. The overall system efficiency of electrical power to blue light is 0.5%, and the internal second-harmonic generation conversion efficiency is as high as 37%. The slope efficiency of 5.5% pJ(-1) at low pulse energies is, to our knowledge, the highest slope efficiency yet reported for frequency conversion into the blue spectral region.
Optics Letters 11/2003; 28(20):1963-5. · 3.40 Impact Factor
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ABSTRACT: Blue light with an average power of as much as 7.5 mW in picosecond pulses has been generated at 486, 488, and 491 nm from a frequency-doubled, nonresonant injection seeded, gain-switched InGaAs/GaAs diode laser by use of a periodically poled KTP waveguide crystal that incorporates a Bragg grating section.
Optics Letters 01/2002; 26(24):1961-2. · 3.40 Impact Factor
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ABSTRACT: Summary form only given. There is considerable interest in compact
lasers that operate in the blue spectral region. A blue laser source
combining a diode laser with a waveguided nonlinear crystal represents
such a compact source which is also stable, self-contained and has a low
overall cost. By using a picosecond-pulse diode laser with a
periodically-poled KTP waveguide crystal a coherent blue source at an
average power of 3.9 mW has been demonstrated. To achieve efficient
second harmonic generation (SHG) from the diode laser we designed a
two-section waveguide crystal with a periodic grating structure and a
Bragg grating, where this grating was fabricated to facilitate
non-resonant injection seeding of the diode laser
Lasers and Electro-Optics, 2001. CLEO '01. Technical Digest. Summaries of papers presented at the Conference on; 02/2001
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ABSTRACT: Electro-optic wavelength tuning of a laser diode has been demonstrated. Wavelength control was achieved using feedback from a Bragg grating embedded in a potassium titanyl phosphate (KTP) waveguide. The novel feature of this technique is the application of a voltage across the Bragg section of the waveguide to control the reflected wavelength. Preliminary experiments on electro-optic control of a diode laser using the embedded Bragg grating resulted in a tuning range of 37 GHz, with single-frequency, CW output power of 1 mW. In these experiments, the waveguide was placed between the plates of a capacitor. Applying electrodes directly to the waveguide structure will significantly increase the tuning range and decrease the voltage required for tuning. Because the tuning mechanism does not require any moving parts, the proposed electro-optically tunable laser is compact and robust. This electro-optically controlled laser diode should be an ideal, narrow linewidth, frequency agile source for seeding high-power lidar systems
Aerospace Conference Proceedings, 2000 IEEE; 02/2000
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ABSTRACT: We demonstrate speckle photography using an optically addressed multiple quantum well spatial light modulator. An optical Fourier transform is used to allow real-time displacement measurements.
Optics Express 06/1998; 2(11):449-53. · 3.59 Impact Factor
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ABSTRACT: We present experimental results of spectral and spatial properties of the laser-pumped cascade emissions from sodium vapor when the transitions of sodium are excited with resonant 330 nm narrowband radiation. We observe a pronounced hollow-conical emission of the 3P3S cascade transition only. The angle and frequency of the hollow-conical radiation depend on the sodium number density. A qualitative theoretical approach that explains the observed effects is outlined.
Optics Communications.
