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Real-time optical spectro-temporal analyzer and method

一种光谱仪、时间的技术，应用在实时分析激光输出的装置领域，能够解决不能提供时域信息等问题，达到便于综合研究的效果

Active Publication Date: 2020-02-21
THE UNIVERSITY OF HONG KONG
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Problems solved by technology

However, it can only provide frequency information, not time domain information
Furthermore, it is only suitable for ultrashort pulses in the fs-ps range, not for pulses on longer timescales, such as those of CW-Q switches.

Method used

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  • Real-time optical spectro-temporal analyzer and method

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Embodiment Construction

[0020] figure 1 An overview of a generalized ROSTA system and method according to an exemplary embodiment of the present invention is shown. Basically, optical signals are diagnosed simultaneously in two different domains (ie, frequency domain / channel and time domain / channel). Then, a comprehensive picture of the spectro-temporal information of the optical signal is obtained through data processing.

[0021] The optical signal is launched into the ROSTA system through a fiber tap coupler at input 11. The signal is passed to an optical splitter 13 which directs part of the signal to the frequency channel 15 and part to the time channel 17 . Thus, ROSTA captures non-repetitive dynamic events in both time and frequency domains. In the time domain, ROSTA monitors the intensity evolution directly via a photodiode (PD) 12 . In the frequency domain, ROSTA utilizes two sub-channels designated for quasi-CW and short pulse components respectively to capture spectral information. T...

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Abstract

An optical signal analyzing apparatus enables real-time and single-shot analysis simultaneously in both time and frequency domains with spectro-temporal analysis. The apparatus includes a fiber tap coupler (11) for receiving an input optical signal from continuous wave (CW) to ultra-short pulses (femtosecond-picosecond). An optical splitter (13) directs part of the signal to a frequency channel (15) and part to a time channel (17). A photodiode (12) in the time channel directly monitors the intensity evolution and converts it to an electrical signal. In the frequency channel (15), two sub-channels are provided: one for CW / quasi-CW and one for short-pulse components. A signal processor (19) analyses the time-and frequency-domain data from the time channel (17) and frequency channel (15) anddisplays the temporal and spectral evolutions simultaneously, so that the two different pieces of information of a non-repeated dynamic event can be correlated in different domains.

Description

technical field [0001] The present invention relates to optical signal analysis devices and methods, and more particularly to devices and methods that enable real-time analysis of laser output in both the time and frequency domains simultaneously. Background technique [0002] Light sources have gained significant popularity over the past few decades due to their wide range of applications. Their various activity scenarios include optical communications, materials processing, astronomical exploration, biological imaging, and other scientific research, such as optical arbitrary waveform generation and coherent spectroscopy, to name a few. See G.P. Agrawal's Fiber-Optic Communication Systems , 3rd edition (Wiley, New York, 2002); L. Shah et al., "Waveguide writing in fusedsilica with a femtosecond fiber laser at 522 nm and 1 MHz repetition rate", Opt. Express 13, 1999-2006 (2005); R.R. Gattass and E. Mazur, "Femtosecond lasermicromachining in transparent materials", Na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01J1/00G01J3/1895G01J3/0218H04J14/02
Inventor 黄建业韦小明李博闻于瀛张驰
Owner THE UNIVERSITY OF HONG KONG
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