Wavelength tunable dual channel solid state laser for terahertz difference frequency generation

Evan Hale; Aleksandr Ryasnyanskiy; George Venus; Ivan Divliansky; Konstantin L. Vodopyanov; Leonid Glebov

doi:10.1117/12.2252410

17 February 2017 Wavelength tunable dual channel solid state laser for terahertz difference frequency generation

Evan Hale, Aleksandr Ryasnyanskiy, George Venus, Ivan Divliansky, Konstantin L. Vodopyanov, Leonid Glebov

Proceedings Volume 10082, Solid State Lasers XXVI: Technology and Devices; 1008210 (2017) https://doi.org/10.1117/12.2252410
Event: SPIE LASE, 2017, San Francisco, California, United States

Abstract

The generation of tunable narrowband terahertz (THz) radiation has shown much interest in recent years. THz systems are used for rotational-vibrational spectroscopy, nondestructive inspection, security screening and others. Monochromatic THz emission has been generated by means of THz parametric oscillation, nonlinear difference frequency generation, and quantum cascade lasers. Intracavity difference frequency generation (DFG) in the nonlinear crystal gallium arsenide (GaAs) is known as an efficient way to generate a continuous wave THz radiation. A novel high power solid state resonator is presented with the use of volume Bragg grating (VBG) technology to create a dual channel system by spectral beam combination. The system consists of two separate Tm:YLF crystals and two VBGs for narrowband wavelength selection. At the end of the resonator both channels share common spherical mirrors, which provide feedback and focuses the beam for nonlinear purposes. This allows each channel to be independent in power and wavelength, eliminating gain competition and allowing individual wavelength tunability. The VBGs are recorded in photo-thermo-refractive glass, which has a high laser induced damage threshold and can withstand the high intracavity power present in the resonator. Tunability of the system has shown spectral spacing from 5 to 20 nm, 0.4 - 1.7 THz, and intracavity continuous wave power levels from 80 to 100 W. By placing the GaAs crystal near the waist, THz radiation can be extracted from the cavity.

Conference Presentation

Citation Download Citation

Evan Hale, Aleksandr Ryasnyanskiy, George Venus, Ivan Divliansky, Konstantin L. Vodopyanov, and Leonid Glebov "Wavelength tunable dual channel solid state laser for terahertz difference frequency generation", Proc. SPIE 10082, Solid State Lasers XXVI: Technology and Devices, 1008210 (17 February 2017); https://doi.org/10.1117/12.2252410

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available