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• Chinese Optics Letters
• Vol. 20, Issue 2, 021403 (2022)
Miao Wang1、2, Jian Ma1、*, Tingting Lu1, Shanjiang Hu1, Xiaolei Zhu1、2、3、**, and Weibiao Chen1、2、3
Author Affiliations
• 1Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
• 2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
• 3Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
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Abstract

A single-resonant low-threshold type-I $β-Ba2BO4$ (BBO) optical parametric oscillator (OPO) with tunable output from 410 nm to 630 nm at 5 kHz repetition rate is reported. By taking the noncollinear phase matching method, low-threshold OPO operation could be obtained compared with the configuration of collinear phase matching, and the maximum optical–optical conversion efficiency of 11.8% was achieved at 500 nm wavelength when 0.4 mJ pump pulse energy was applied. When the noncollinearity angle was preset at 1.6°, 4.8°, and 6.3°, a continuously tuning output with a total spectral range of 220 nm was successfully obtained by adjusting the phase matching angle of the BBO crystal.

1. Introduction

The blue–green spectrum is the optical transmission window of seawater, which can be used for underwater laser communication, laser bathymetry, and ocean LIDAR. The attenuation coefficient varies from different types of seawater, and the optimal wavelengths for laser detection in deep seawater are between 420 nm and 510 nm, while the optimal wavelengths for coastal seawater are between 520 nm and 580 nm[15]. As is known[6], an optical parametric oscillator (OPO) pumped by a solid-state laser is regarded as a promising tunable laser source. In particular, a $β-Ba2BO4$ (BBO) OPO pumped by an ultraviolet laser is able to generate a wide range of wavelength emission from blue to near infrared[79]. In 1988, Cheng et al. firstly, to the best of our knowledge, reported the BBO-OPO pumped by 355 nm with the signal output tunable from 0.48 to 0.63 µm, where its total maximum energy conversion efficiency was 9.4% when the pump pulse energy was $∼15 mJ$[10]. Later, Fan et al. reported a tunable BBO-OPO design, at 30 Hz repetition rate, using three sets of mirrors so that wavelength tuning range covered from 412 nm to 2.55 µm[11].

Copy Citation Text
Miao Wang, Jian Ma, Tingting Lu, Shanjiang Hu, Xiaolei Zhu, Weibiao Chen. Development of single-resonant optical parametric oscillator with tunable output from 410 nm to 630 nm[J]. Chinese Optics Letters, 2022, 20(2): 021403