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1.
The transient regime of a multiwavelength pyrometer 总被引:2,自引:0,他引:2
The transient operation of a new multiwavelength pyrometer based on a dispersing prism and a Si photodiode array is presented. After calibration, transient tests were performed using a tungsten strip lamp, supplied by a current pulse of 0.3-s duration. Measurements were carried out with a data acquisition system consisting of a FET multiplexer, a DVM (14 bit, 100 kHz), and a buffer memory (64 kbytes). Pyrometer signals are processed off-line, and temperature vs time is displayed. With the present arrangement, temperature measurements at 20 wavelengths may be performed with 200s resolution. Faster measurements are possible with a reduced number of channels.Paper presented at the Third Workshop on Subsecond Thermophysics, September 17–18, 1992, Graz, Austria.Deceased 相似文献
2.
可调谐多波长布里渊掺铒光纤激光器将光纤中的SBS非线性放大同掺铒光纤的线性放大相结合得到室温稳定的多波长输出,具有波长间隔一致、线宽窄、功率谱相对平坦等优点。设计了一种基于光纤布拉格(FBG)反射的线性可调谐多波长布里渊掺铒光纤激光器。该线性腔激光器的一端利用光纤布拉格光栅作为反射镜,有效抑制了腔内自激模的影响,增加激光器输出波长数。布里渊泵浦信号进入布里渊增益介质之前经过掺铒光纤放大器的两次放大,降低了布里渊增益的阈值。该多波长激光器实现了1 530~1 560 nm之间30 nm可调谐范围的输出。在布里渊泵浦信号功率2 mW,980 nm泵源抽运功率60 mW情况下,1 540~1 554 nm范围内,获得了波长间隔0.088 nm的16个波长的输出。 相似文献
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三羟基荧光酮类试剂用于多组分分子光谱分析的进展 总被引:10,自引:1,他引:9
简要讨论了三羟基荧光酮类试剂的结构与分析能间的关系,评述了其用于不分离同时分光光度多组分分析和荧光分析的进展和发展趋势,文内涉及125篇参考文献,选引其中72篇。 相似文献
6.
采用Er^3 /Yb^3 共掺双包层光纤(EYDF)作为增益介质,利用一段标准的多模光纤作为空间梳状滤波器,于室温下实现了5个波长的稳定输出。通过调节偏振控制器的状态,可以实现对波长振荡个数和波长间隔的控制。腔中不加任何的稳定装置,在激光输出功率高于207mw时,仍能够得到多波长的稳定振荡,单一波长的线宽窄于0.15nm,边模抑制比大于32dB。通过优化单模光纤与多模光纤的熔接,选择更加合适的多模光纤,可实现更多波长个数的稳定的多波长输出。 相似文献
7.
Optical metasurfaces, as an emerging platform, have been shown to be capable of effectively manipulating the local properties (amplitude, phase, and polarization) of the reflected or transmitted light and have unique strengths in high‐density optical storage, holography, display, etc. The reliability and flexibility of wavefront manipulation makes optical metasurfaces suitable for information encryption by increasing the possibility of encoding combinations of independent channels and the capacity of encryption, and thus the security level. Here, recent progress in metasurface‐based information encoding is reviewed, in which the independent channels for information encoding are built with wavelength and/or polarization in one‐dimensional/two‐dimensional (1D/2D) modes. The way to increase information encoding capacity and security level is proposed, and the opportunities and challenges of information encoding with independent channels based on metasurfaces are discussed. 相似文献
8.
多波长掺镱光纤线形腔激光器的实验研究 总被引:1,自引:0,他引:1
利用两个光纤环镜作为线形腔的端镜,在其中一个环镜中加入腔长可调的F-P腔构成梳状滤波器,从而产生波长间隔可调的多波长激光振荡.实验结果表明,当波长间隔大于1.3nm时,器件可以产生室温下稳定的多波长激光. 相似文献
9.
A wavelength-spacing switchable multiwavelength erbium-doped fiber lasers incorporating a highly nonlinear fiber (HNLF) based on nonlinear polarization rotation (NPR) has been demonstrated. The intensity-dependent transmission effect originating from NPR ensures room-temperature multi-wavelength lasing, which is further self-stabilized by the four-wave mixing in the HNF. Moreover, the equivalent Lyot birefringence fiber filter with two cascaded birefringence fibers makes the wavelength spacing switchable depending on the effective length of the birefringence fiber. The experimentally obtained multiwavelength outputs agree well with the simulation filter transmission spectra. 相似文献
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