高强度激光脉冲信噪比的单次测量技术

马金贵; 王永志; 袁鹏; 王静; 朱鹤元; 钱列加

doi:doi:10.3788/lop50.080008

激光与光电子学进展, 2013, 50 (8): 080008, 网络出版: 2013-08-08

高强度激光脉冲信噪比的单次测量技术

Single-Shot Pulse-Contrast Measurement for High-Intensity Lasers

论文大纲

马金贵 ^1,*王永志 ¹袁鹏 ²王静 ²朱鹤元 ¹钱列加 ¹

作者单位

¹ 复旦大学光科学与工程系，上海 200433

² 上海交通大学物理系激光等离子体教育部重点实验室，上海 200240

摘要

脉冲信噪比是高强度激光的一个重要技术参数，反映了激光系统的技术水平。由于高强度激光的重复频率很低甚至单次运行，必须开发实时的单次测量技术。当前，信噪比单次测量技术非常匮乏，技术难度远高于扫描测量方式。本课题组提出了可实现大窗口、高动态范围测量的技术方案，形成了系列创新技术，通过关键技术集成研制了实用化的测量样机。原理性验证实验考核了技术方案的可行性、可靠性和主要技术性能，已实现动态范围约为109、时间窗口50～100 ps和分辨率0.5～1 ps的信噪比单次测量，且在时间窗口内无测量引入的假信号。脉冲信噪比单次测量样机已成功应用于我国的拍瓦激光装置。

Abstract

Pulse contrast is an important specification of high-intensity laser, reflecting the technical level of the laser system. As such lasers generally operate in a very low repetition rate and even in a single-shot mode, real-time single-shot measuring techniques are necessary for diagnosing pulse contrast. Compared with time-scanning measurement, the techniques for single-shot measurement are very deficient and more difficult. We present a new measuring scheme supporting high dynamic range and large temporal window simultaneously. Integrating the series of innovative technologies, we make a practical measuring prototype whose feasibility and reliability as well as the main performance have been examined by the proof-of-principle experiments. The pulse contrast can now been measured with high resolution and high fidelity at a dynamic range of about 109 within a temporal window of 50～100 ps. The invented measuring prototype has been applied successfully in the national petawatt laser system.

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马金贵, 王永志, 袁鹏, 王静, 朱鹤元, 钱列加. 高强度激光脉冲信噪比的单次测量技术[J]. 激光与光电子学进展, 2013, 50(8): 080008. Ma Jingui, Wang Yongzhi, Yuan Peng, Wang Jing, Zhu Heyuan, Qian Liejia. Single-Shot Pulse-Contrast Measurement for High-Intensity Lasers[J]. Laser & Optoelectronics Progress, 2013, 50(8): 080008.

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