WANG Zelong; WANG Yuye; LI Haibin; ZHANG Jingxi; XU Degang; YAO Jianquan

doi:10.7498/aps.74.20241349

Abstract

Terahertz (THz) waves have been widely investigated recently due to their ability to reflect the fingerprint characteristics of samples. As a promising method, THz technology has aroused great interest in various applications, especially biological imaging, environmental monitoring, non-destructive evaluation, spectroscopy and molecular analysis. In order to reveal the intramolecular vibration/rotation information of various compounds, the linewidths of their absorption lines are usually in a range of GHz or even MHz, and THz waves with wide tunability, narrow linewidth, high frequency accuracy, and high power stability are required. Currently, the linewidth with GHz level and low SNR at higher frequency still limit its further applications in reveal intramolecular information. In this work, the thermal distribution characteristics of DAST crystals based on diamond substrates under continuous laser pumping conditions are theoretically studied by COMSOL Multiphysics, and the effectiveness of diamond substrates in dissipating heat from DAST crystals is experimentally verified. Then, a narrow-linewidth and tunable organic-crystal continuous-wave terahertz source is demonstrated. Two narrow-linewidth continuous-wave (CW) fiber lasers are used as the pump sources for generating difference frequency. The terahertz wave is continuously tunable in a range of 1.1–3 THz. The maximum output power of 3.39 nW is obtained at 2.493 THz. The power fluctuation in 30 min is measured to be 2.19%. In addition, the generated THz wave has a high polarization extinction ratio of 9.44 dB. Using this CW-THz source for high-precision spectral detection of air with different humidity, the results correspond well with the gas absorption spectral lines in the Hitran database, proving that the CW-THz source has narrow linewidth, high frequency accuracy and stability. Therefore, it can promote the practical application of tunable CW-THz source, thus having good potential in THz high-precision spectroscopic detection and multispectral imaging.

Keywords:

Authors and contacts

Corresponding author: WANG Yuye, yuyewang@tju.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 62175182, 62275193, U22A20123, U22A20353).

FullText HTML

References

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]

Cited By

DownLoad: Full-Size Img PowerPoint

	晶体无形变	热应力导致晶体内部发生可恢复微小形变(降低功率可复原)	热应力导致晶体内部发生不可恢复形变(降低功率不可复原)	晶体熔化
DAST	P < 0.45 W	0.45 W ≤ P < 0.75 W	0.75 W ≤ P < 1.20 W	P ≥ 1.20 W
Diamond-DAST	P < 1.10 W	1.10 W ≤ P < 1.70 W	1.70 W ≤ P < 2.65 W	P ≥ 2.65 W

DownLoad: CSV

map

[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
[9]
[10]
[11]
[12]
[13]
[14]
[15]
[16]
[17]
[18]
[19]
[20]
[21]
[22]
[23]
[24]

[1]	LIANG Shijie, ZOU Jiaqi, WANG Wenjing, LIU Di, HUO Yanyan, NING Tingyin. Numerical study of tunable terahertz radiation from differential frequency generation in high-Q geometrically perturbed grating waveguide structures. Acta Physica Sinica, 2025, 74(3): 034204. doi: 10.7498/aps.74.20240854
[2]	Li Xiao-Nan, Zhou Lu, Zhao Guo-Zhong. Terahertz vortex beam generation based on reflective metasurface. Acta Physica Sinica, 2019, 68(23): 238101. doi: 10.7498/aps.68.20191055
[3]	Ma Jin-Dong, Wu Hao-Yu, Lu Qiao, Ma Ting, Shi Lei, Sun Qing, Mao Qing-He. Fiber-type difference frequency generation infrared optical frequency comb based on the femtosecond pulses generated by a mode-locked fiber laser. Acta Physica Sinica, 2018, 67(9): 094207. doi: 10.7498/aps.67.20172503
[4]	Xie Shi-Yong, Zhang Xiao-Fu, Yang Cheng-Liang, Le Xiao-Yun, Bo Yong, Cui Da-Fu, Xu Zu-Yan. Continuous-wave single-frequency 589 nm yellow laser generated from sum frequency of single-block non-planar ring cavity laser in periodically poled KTiOPO4 crystal. Acta Physica Sinica, 2016, 65(9): 094203. doi: 10.7498/aps.65.094203
[5]	Chai Lu, Niu Yue, Li Yan-Feng, Hu Ming-Lie, Wang Qing-Yue. Recent progress of tunable terahertz sources based on difference frequency generation. Acta Physica Sinica, 2016, 65(7): 070702. doi: 10.7498/aps.65.070702
[6]	Zhang Hui-Yun, Liu Meng, Zhang Yu-Ping, Shen Duan-Long, Wu Zhi-Xin, Yin Yi-Heng, Li De-Hua. Research of continuous wave pumping waveguide to generate terahertz laser. Acta Physica Sinica, 2014, 63(2): 020702. doi: 10.7498/aps.63.020702
[7]	Li Zhong-Yang, Bing Pi-Bin, Xu De-Gang, Cao Xiao-Long, Yao Jian-Quan. Theoretical research on terahertz wave generation based on cascaded parametric oscillation. Acta Physica Sinica, 2013, 62(8): 084212. doi: 10.7498/aps.62.084212
[8]	Huang Jing-Guo, Lu Jin-Xing, Zhou Wei, Tong Jing-Chao, Huang Zhi, Chu Jun-Hao. Investigation of high power terahertz emission in gap crystal based on collinear difference frequency generation. Acta Physica Sinica, 2013, 62(12): 120704. doi: 10.7498/aps.62.120704
[9]	Chen He-Ming, Meng Qing. Design of high efficiency photonic crystal terahertz filter. Acta Physica Sinica, 2011, 60(1): 014202. doi: 10.7498/aps.60.014202
[10]	Lu Jin-Xing, Huang Zhi-Ming, Huang Jing-Guo, Wang Bing-Bing, Shen Xue-Min. Analysis of the effect of phase-mismatch and material absorption on the terahertz-wave generation from GaSe. Acta Physica Sinica, 2011, 60(2): 024209. doi: 10.7498/aps.60.024209
[11]	Zhong Kai, Yao Jian-Quan, Xu De-Gang, Zhang Hui-Yun, Wang Peng. Theoretical research on cascaded difference frequency generation of terahertz radiation. Acta Physica Sinica, 2011, 60(3): 034210. doi: 10.7498/aps.60.034210
[12]	Zhang Rong, Cao Jun-Cheng. Research on modulation property of photonic crystals in terahertz range. Acta Physica Sinica, 2010, 59(6): 3924-3929. doi: 10.7498/aps.59.3924
[13]	Li Zhong-Yang, Yao Jian-Quan, Li Jun, Bing Pi-Bin, Xu De-Gang, Wang Peng. Theoretical study of tunable terahertz radiation based on stimulated polariton scattering in zinc blende crystal. Acta Physica Sinica, 2010, 59(9): 6237-6242. doi: 10.7498/aps.59.6237
[14]	Wang Zhuo, Wang Yu-Ye, Yao Jian-Quan, Wang Peng. The study of narrow-band terahertz-wave generation by difference frequency mixing in periodical-inverted GaAs crystal with ps pump pulses. Acta Physica Sinica, 2010, 59(5): 3249-3254. doi: 10.7498/aps.59.3249
[15]	Jiang Jian, Chang Jian-Hua, Feng Su-Juan, Mao Qing-He. Mid-IR multiwavelength difference frequency generation laser source based on fiber lasers. Acta Physica Sinica, 2010, 59(11): 7892-7898. doi: 10.7498/aps.59.7892
[16]	Huang Nan, Li Xue-Feng, Liu Hong-Jun, Xia Cai-Peng. Effects of gain saturation in terahertz radiation based on difference frequency generation. Acta Physica Sinica, 2009, 58(12): 8326-8331. doi: 10.7498/aps.58.8326
[17]	Liu Huan, Xu De-Gang, Yao Jian-Quan. Theoretical study of tunable terahertz radiation based on difference-frequency generation in GaSe and ZnGeP2 crystals. Acta Physica Sinica, 2008, 57(9): 5662-5669. doi: 10.7498/aps.57.5662
[18]	Han Hai_Nian, Zhao Yan_Ying, Zhang Wei, Zhu Jiang_Feng, Wang Peng, Wei Zhi_Yi, Li Shi_Qun. Measurement of carrier-envelope phase of few cycles Ti:sapphire laser by difference frequency technique. Acta Physica Sinica, 2007, 56(5): 2756-2759. doi: 10.7498/aps.56.2756
[19]	Sun Bo, Yao Jian-Quan, Wang Zhuo, Wang Peng. Study of tunable terahertz-wave generation via difference frequency mixing in isotropic semiconductor crystals. Acta Physica Sinica, 2007, 56(3): 1390-1396. doi: 10.7498/aps.56.1390
[20]	HUO CHONG-RU, HUANG XI-YI. THE GENERATION OF FAR-INFRARED RADIATION BY DIF-FERENCE-FREQUENCY MIXING OF SURFACE WAVES. Acta Physica Sinica, 1980, 29(12): 1581-1587. doi: 10.7498/aps.29.1581

Catalog

Vol. 74, Issue 3 - 2025-02-05

Metrics

Abstract views: 1122
PDF Downloads: 80
Cited By: 0

姓名
邮箱
手机号码
标题
留言内容
验证码

Search

Article

留言板

Abstract

Authors and contacts

Corresponding author: WANG Yuye, yuyewang@tju.edu.cn

FullText HTML

References

Cited By

Catalog

Metrics

Authors

Referees

About Journal

About

Search

Article

留言板

Abstract

Authors and contacts

Corresponding author: WANG Yuye, yuyewang@tju.edu.cn

FullText HTML

References

Cited By

Catalog

Metrics

Publishing process

Authors

Referees

About Journal

About