Tunable External Cavity Laser Based on Liquid Crystal Fabry-Perot Interferometer and Liquid Crystal Phase Shifter

Seah, Lay Hoon; Murukeshan, Vadakke Matham; Wang, P.; Chao, Z. X.

doi:10.1080/15599610701232622

Cited by 4 publications

(3 citation statements)

References 12 publications

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“…After applying a correction based on proportional, integral, and derivative parameters (denoted P, I, and D respectively), the output value U 2 (s) was sent to the PZT driver to control the output frequency. [20] The fuzzy PID controller is composed of the conventional PID controller and the fuzzy algorithm. There are two input parameters of the fuzzy algorithm, which are the error value E and the rate of error change Ec.…”

Section: Proposed Algorithmmentioning

confidence: 99%

Fuzzy logic based feedback control system for the frequency stabilization of external-cavity semiconductor lasers

Wang

et al. 2020

International Journal of Optomechatronics

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This paper proposes an intelligent approach (fuzzy logic) for the design of external-cavity semiconductor lasers (ECLs) for better disturbance rejection. As a kind of nonlinear optical system, ECL output frequency is difficult to be stabilized by conventional methods. The fuzzy logic algorithm is preferred for ECLs stabilization, which could update parameters automatically. Suddenability to reject nonlinear disturbances arch occur in the fuzzy logic systemduring operation, speed of operation and PID gains are alteredonline in accordance with the disturbances to reject. To showthe efficacy of the proposed method, a fuzzy logic ECL stabilization system is designed. The results prove that our method is effective and robust.

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Section: Proposed Algorithmmentioning

confidence: 99%

Fuzzy logic based feedback control system for the frequency stabilization of external-cavity semiconductor lasers

Wang

et al. 2020

International Journal of Optomechatronics

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“…Other LC/polymer composites including polymer-dispersed LC [2,3,15,16] (PDLC), holographic polymerdispersed LC [1,17,18] (H-PDLC), and polymer-stabilized LC (PSLC) [19] have been also widely studied for tunable lasers. With the rapid development of micro-nano-science and technology, various types of microresonators have been developed, such as the Fabry-Perot cavity [20], distributed feedback (DFB) gratings [17,18], photonic crystals [5], and random resonators [3][4][5]. As a result, the above mentioned LC and LC-based composite materials (nematic, cholesteric, blue phase, sematic, PDLC, H-PDLC, and PSLC etc.)…”

Section: Instructionmentioning

confidence: 99%

Lasing properties from dye-doped holographic polymer dispersed liquid crystal confined in two-dimensional cylindrical geometry

Zhang¹,

Dai²,

Yan³

et al. 2016

Opt. Mater. Express

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In this paper, we investigate the lasing behavior of holographic polymer dispersed liquid crystals (H-PDLCs) filled in capillary tubes (CTs). The emission properties from CTs with various core diameters are explored experimentally. The experimental results show that the smallest threshold is 19.4 μJ/pulse in CTs III (300 μm) corresponding to the largest FWHM 0.42 nm. The minimum FWHM is 0.29 nm in CTs I (75 μm) corresponding to largest threshold 31.5 μJ/pulse. According to experimental results and theoretical analysis, the different lasing behaviors from various core diameters of CTs are mainly due to the effect of phase separation between LC-rich and polymer-rich area during exposure. The temperature effects on lasing properties of H-PDLC in CTs were also investigated. Our work verifies the possibility to achieve miniature laser devices in cylindrical confinement structures, such as CT, hollow-fiber or photonic crystal fiber, and extends the applicable scope of H-PDLC.

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“…The main feature of the passive ring resonator gyro is that the source is external to the cavity. The advantages are a high sensitivity, low fabrication and power cost, and shock and vibration immunity due to the absence of gain variations of the laser, small number of components and no moving parts (Seah et al 2007). Moreover, passive structures solve problems of the active configuration such us lock-in effect and mode competition.…”

Section: Introductionmentioning

confidence: 99%

Direct-Coupled Large-Diameter Silica on Silicon Waveguide Ring Resonator Used in Microoptic Gyro

Guo

Shi

Zhao

et al. 2011

International Journal of Optomechatronics

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A kind of direct-coupled large-diameter silica on silicon waveguide ring resonator used in microoptic gyro with 4 cm diameter was presented. An optical and electromechanical test platform was designed to investigate the performance of the ring resonator. The resonance curve, demodulation curve and three relative important resonator parameters were obtained. The free spectral range of the resonator, the full width at half maximum of the resonance curve and the finesse of the resonator, are 3 GHz, 73 MHz and 41, respectively. Open-loop experiments of resonator are set up using the acousto-optic frequency modulation spectroscopy technique. The output of MOG is investigated by the platform rotate and equivalent gyro rotate. The slope of the linear fit is about 3.154 mV/( /s) based on the À50$50 /s rotating rates and 0.330 mV/( /s) based on the À900$900 KHz equivalent frequency shift, respectively. The demodulation curve shows a strongly nonlinear and the linear approximation has a great limitation.

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Tunable External Cavity Laser Based on Liquid Crystal Fabry-Perot Interferometer and Liquid Crystal Phase Shifter

Cited by 4 publications

References 12 publications

Fuzzy logic based feedback control system for the frequency stabilization of external-cavity semiconductor lasers

Fuzzy logic based feedback control system for the frequency stabilization of external-cavity semiconductor lasers

Lasing properties from dye-doped holographic polymer dispersed liquid crystal confined in two-dimensional cylindrical geometry

Direct-Coupled Large-Diameter Silica on Silicon Waveguide Ring Resonator Used in Microoptic Gyro

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