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The Study on an All-solid-state Quasi-continuous Dual-wavelength Tunable Ti3+: Sapphire Laser and THz Radiation via Optical Difference Frequency Generation

Author: MaHongMei
Tutor: DingXin
School: Tianjin University
Course: Physical Electronics
Keywords: All solid titanium sapphire laser Dual Wavelength Tunable Terahertz Periodically poled niobium lithium
CLC: TN248
Type: Master's thesis
Year: 2007
Downloads: 160
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Abstract


Dual-wavelength laser differential absorption lidar, atmospheric pollution monitoring, has important applications in nonlinear optical mixing, application to promote the rapid development of tunable dual-wavelength lasers. Been reported in the literature of the dual-wavelength lasers in the early seventies and late eighties, a new dual-wavelength lasers - the titanium the Bao Shi Shuangbo long laser, which by virtue of their large stimulated emission cross section, a wide tuning range acclaimed advantages. At home and abroad have been undertaken in this area a lot of research work, and its rapid development and become one of the most active issue in the field of laser technology. The papers of all-solid-state quasi-continuous dual-wavelength tunable titanium-sapphire laser operation theoretical tuning mode and dual-wavelength difference frequency generation the THz technology aspects of the theoretical and experimental studies, the specific content and innovation can be summarized in the following four aspects: 1, starting from the rate equation of the four-level system, given the all-solid-state quasi-continuous dual-wavelength tunable titanium sapphire laser rate equations and derive threshold conditions for the dual-wavelength operation at the same time. 2, based on interference principle and dispersion principle, respectively, using the birefringent filter and prism two components of all-solid-state quasi-continuous dual-wavelength tunable titanium sapphire laser laser tuning and narrow linewidth pressure. Theoretical and curve analog birefringent filter tuning and linewidth narrowed principle and design best birefringent filter group piece (three combination BF, thickness h for 1:2:4) ; principle of double-prism dispersion theory and design prism of parameter values. 3, LD pumped intracavity frequency doubling Nd: YAG laser as the pump source, the birefringent filter and prism two tuning elements to achieve all-solid-state quasi-continuous dual-wavelength tunable titanium sapphire laser operation, the highest output power of 5.6W (birefringent filter tuning mode), the widest wavelength tuning range (prism tuning mode) shortwave from 750 ~ 795nm, long-wavelength from 800 ~ 850nm, and summarizes the advantages and disadvantages of the two tuning mode. 4, poled lithium niobate crystal tilt cycle difference frequency generated THz wave theory model and proposed dual wavelength tunable titanium sapphire laser PPLN intracavity difference frequency the THz laser experiments program. When the dual-wavelength output in 781.2 to 805.4nm, PPLN working temperature of 140 ° C, and the polarization cycle 10μm near the intracavity difference frequency technology, tuned dual-wavelength THz wave radiation, a 4 ~ 6THz broadband.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser
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