Institute of Laser and Optoelectronics

Engineering

Institute of Laser and Optoelectronics

Engineering
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Liu P.,Institute of Laser and Optoelectronics | Liu P.,Tianjin University | Xu D.,Institute of Laser and Optoelectronics | Xu D.,Tianjin University | And 12 more authors.
Journal of Lightwave Technology | Year: 2013

A scheme for monochromatic terahertz (THz) generation via cascading enhanced Cherenkov-type difference frequency generation (DFG) in a sandwich-like waveguide is proposed. The novel scheme has the potential to overcome the quantum-defect limit and to provide an efficient output coupling. This process is elucidated by developing a coupled-mode theory and taking into account the pump depletion, waveguide mode properties, and THz output coupling. The effect of cascading enhancement is analyzed by comparing with non-cascaded DFG situation. It is predicted that THz power can be boosted by nearly 8-fold with a 400 MW/cm2 pump in a 40-mm-long Si-LiNbO3-Si waveguide. © 1983-2012 IEEE.


Yao J.,Institute of Laser and Optoelectronics | Wang Y.,Institute of Laser and Optoelectronics
Springer Series in Optical Sciences | Year: 2012

Tunable titanium doped sapphire laser (abbreviate as Ti:sapphire laser, or Ti:S laser) is an all-solid-state laser using Ti: Al 2O 3 crystal as laser medium. If all-solid-state tunable laser technology is seen as one development direction of the tunable laser technology, up to now, Ti:sapphire laser is the most practical, fast, and mature technology, which was first developed by Prof. Moulton in MIT (Opt. News, No. 6, 9, 1982; Solid State Research Rep. DTIC ADA 124305/4, 15 - 21, 1982; The twelfth international quantum electronics conference. Munich, Germany, June 1982). Ti:sapphire laser has been famous for wide tuning range of 670-1,200 nm, high conversion efficiency, and various operation ways (it includes continuous and pulse operation, where the pulse operation can be divided into long pulse, short pulse, and ultrashort pulse, etc.). © 2012 Springer-Verlag Berlin Heidelberg.


Yao J.,Institute of Laser and Optoelectronics | Wang Y.,Institute of Laser and Optoelectronics
Springer Series in Optical Sciences | Year: 2012

Optical parametric oscillator (OPO) is an optical frequency conversing instrument using the frequency mixing characteristic of nonlinear crystal, in which one or two waves have the oscillating characteristic during the process of nonlinear frequency conversion. Meanwhile, optical parametric amplification (OPA) is a kind of equipment only amplifying the signal light. The former generally has a resonant cavity and the latter does not. In some references, OPO and OPA are named as optical parametric generation (OPG). © 2012 Springer-Verlag Berlin Heidelberg.


Yao J.,Institute of Laser and Optoelectronics | Wang Y.,Institute of Laser and Optoelectronics
Springer Series in Optical Sciences | Year: 2012

Nonlinear optical effects provide a means for extending the frequency range of available laser wavelengths. The nonlinear optical crystals are the basic tools, which decide the generated wavelength, output power, spectral linewidth, beam quality, and so on. In this chapter, we will review the basic theory and three-wave interaction in nonlinear optical crystals. The crystal parameters which affect nonlinear optical generation will be discussed. © 2012 Springer-Verlag Berlin Heidelberg.


Yao J.,Institute of Laser and Optoelectronics | Wang Y.,Institute of Laser and Optoelectronics
Springer Series in Optical Sciences | Year: 2012

Since some new materials are well fabricated, the solid-state tunable laser has become the most attractive area of the tunable laser. In this chapter, several paramagnetic ions doped solid laser and color-center lasers are introduced. © 2012 Springer-Verlag Berlin Heidelberg.


Yao J.,Institute of Laser and Optoelectronics | Wang Y.,Institute of Laser and Optoelectronics
Springer Series in Optical Sciences | Year: 2012

Since second-harmonic generation (SHG) was regarded as the basis of the frequency conversion, the SHG laser has been viewed as the most typical application of the frequency conversion techniques, e.g., acousto-optic Q-switch intracavity SHG YAG (or YLF) and cw active mode locked intracavity SHG YAG (or YLF) laser. The pulse widths are above 100-300 ns and 100-200 ps for these two kinds of laser, respectively. Here, the SHG lasers are designated as intracavity SHG lasers and are different from the extracavity SHG lasers. © 2012 Springer-Verlag Berlin Heidelberg.


Yao J.,Institute of Laser and Optoelectronics | Wang Y.,Institute of Laser and Optoelectronics
Springer Series in Optical Sciences | Year: 2012

Newman (J. Appl. Phys. 34:437, 1963) first presented the use of semiconductor sources to pump a solid-state laser. The technology of diode-pumped solid-state laser (DPL) is now mature after more than 40 years development. DPL has attracted much attention in broad applications, such as industry, medical and military fields, scientific research, etc., due to the advantages of high efficiency, compact configuration, long lifetime, high reliability, and good beam quality. In this chapter, we firstly present a historical overview of DPL for four stages. Then, the principle DPL and related thermal effect will be introduced. Based on the theoretical analysis, different kind of DPL devices have been developed. Finally, the THz-wave generation using DPL technology also will be presented. © 2012 Springer-Verlag Berlin Heidelberg.


Yao J.,Institute of Laser and Optoelectronics | Wang Y.,Institute of Laser and Optoelectronics
Springer Series in Optical Sciences | Year: 2012

The nonlinear optics mixing theory and technology have been well developed. As early as 1961, the theory of second harmonic wave was presented. Frequency doubling with ruby laser (694.3 nm) and ultraviolet radiation with 347.15 nm wavelength were achieved at the level of the conversion efficiency of only 10 - 8. Later, the phenomenon of mixing between the two lasers with different frequencies (such as sum frequency, difference frequency, and optical rectification) was found, and the technology of phase matching was developed. After that, the higher conversion efficiencies of optical frequency doubling and optical mixing were achieved. Development of nonlinear mixing technology is closely connected with laser apparatus and technology. Emergence of lasers with newly discovered wavelengths present new requirement for nonlinear crystals and mixing technology. Also, the appearance ofQ-switch and ultra-short pulse technology made the peak power improved greatly, and the efficiency of frequency doubling reached 70-80%. On the other hand, the high peak power aroused the problems of laser damage threshold and the new task of expanding wavelength from infrared radiation to ultraviolet radiation. Optical frequency doubling, optical mixing, and optical parameter oscillation are important to realize frequency conversion in the laser technologies at present. If a tunable laser and a laser with fixed wavelength (or two tunable lasers) are mixed in the nonlinear crystal, new tunable wavelengths can be achieved. If the obtained new laser is used as pump source for tunable laser, optical parameter oscillator laser, or stimulated Raman scattering laser, further other new tunable wavelengths can be obtained. Optical mixing can expand the laser wavelength to the directions of ultraviolet radiation and infrared radiation. © 2012 Springer-Verlag Berlin Heidelberg.


Yao J.,Institute of Laser and Optoelectronics | Wang Y.,Institute of Laser and Optoelectronics
Springer Series in Optical Sciences | Year: 2012

Quasi-phase matching (QPM) is a technique in nonlinear optics which allows a positive net flow of energy from the pump frequency to the signal and idler frequencies by creating a periodic structure in the nonlinear medium. The advent and rapid evolution of lithographically controlled patterning of nonlinear media beginning in the late 1980s led to widespread use of QPM media, which have opened up new operating regimes for nonlinear interactions. QPM has a role both as a more efficient way to accomplish functions available in homogeneous media, and as a way to implement functions unavailable in conventional media. Due to the advantages of flexible tuning and high efficiency, QPM has been applied in many fields. In this chapter, the principles of QPM and various QPM-OPO tuning technology will be introduced. Then typical experiments with periodically poled crystal will be presented. © 2012 Springer-Verlag Berlin Heidelberg.


Yao J.,Institute of Laser and Optoelectronics | Wang Y.,Institute of Laser and Optoelectronics
Springer Series in Optical Sciences | Year: 2012

In this chapter, some other tunable lasers will be briefly introduced, such as tunable dye laser, stimulated Raman laser, fiber Raman laser, and so on. These tunable technologies and theory still can be used for many fields, for example, laser radar, chemical reaction, biology, holography, medicine, nonlinear optics, etc. © 2012 Springer-Verlag Berlin Heidelberg.

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