High-energy and ultra-wideband tunable terahertz source with DAST crystal via difference frequency generation

被引：41

作者：

He, Yixin ^{[1
,2
]}

Wang, Yuye ^{[1
,2
,3
]}

Xu, Degang ^{[1
,2
]}

Nie, Meitong ^{[1
,2
]}

Yan, Chao ^{[1
,2
]}

Tang, Longhuang ^{[1
,2
]}

Shi, Jia ^{[1
,2
]}

Feng, Jiachen ^{[1
,2
]}

Yan, Dexian ^{[1
,2
]}

Liu, Hongxiang ^{[1
,2
]}

Teng, Bing ^{[5
]}

Feng, Hua ^{[3
,4
]}

Yao, Jianquan ^{[1
,2
]}

机构：

[1] Tianjin Univ, Sch Precis Instrument & Optoelect Engn, Inst Laser & Optoelect, Tianjin 300072, Peoples R China

[2] Tianjin Univ, Key Lab Optoelect Informat Technol, Minist Educ, Tianjin 300072, Peoples R China

[3] Third Mil Med Univ, Southwest Hosp, Inst Neurosurg, Chongqing 400038, Peoples R China

[4] Qingdao Univ, Coll Phys, Qingdao 266071, Peoples R China

[5] Qingdao Univ, Key Lab Photon Mat & Technol Univ Shandong, Qingdao 266071, Peoples R China

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2018年 / 124卷 / 01期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

OPTICAL PARAMETRIC OSCILLATOR; THZ WAVE GENERATION; NARROW-BAND; TOSYLATE; LASER; SPECTROSCOPY; RADIATION; PULSES; DFG;

D O I：

10.1007/s00340-017-6887-4

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have demonstrated a high-energy and broadly tunable monochromatic terahertz (THz) source based on difference frequency generation (DFG) in DAST crystal. A high-energy dual-wavelength optical parametric oscillator with two KTP crystals was constructed as a light source for DFG, where the effect of blue light was first observed accompanying with tunable dual-wavelength pump light due to different nonlinear processes. The THz frequency was tuned randomly in the range of 0.3-19.6 THz. The highest energy of 870 nJ/pulse was obtained at 18.9 THz under the intense pump intensity of 247 MW/cm(2). The THz energy dips above 3 THz have been analyzed and mainly attributed to the resonance absorption induced by lattice vibration in DAST crystal. The dependence of THz output on the input energy was studied experimentally, and THz output saturation was observed. Furthermore, tests of transmission spectroscopy of four typical samples were demonstrated with this ultra-wideband THz source.

引用

页数：8

共 36 条

[1] High-quality organic 4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) crystals for THz wave generation [J].