Microchip dual-frequency laser with well-balanced intensity utilizing temperature control

Abstract

A continuous-wave microchip dual-frequency laser (DFL) with well balanced intensity was presented. In order to obtain such a balanced intensity distribution of the two frequency components, the DFL wavelengths were precisely tuned and spectrally matched with the emission cross section (ECS) spectrum of the gain medium by employing a temperature controller. Finally, when the heat sink temperature was controlled at -5.6°C, a 264 mW DFL signal was achieved with frequency separation at 67.52 GHz and intensity balance ratio (IBR) at 0.991.

Effect of wavelength accuracy of reconstruction-equivalent-chirp laser arrays on performance of wavelength division multiplexing space laser communication system

“…13 However, the residual error of wavelength spacing in REC-MWLAs still exists, although the accuracy has been improved to a certain extent. 14 Apart from the inaccuracy caused by the imperfect design and production process of REC laser arrays, the phenomenon of wavelength deviation emerges as well due to the increasing chip temperature and other uncertainty factors in the long working process, which leads to channel crosstalk during demultiplexing and multiplexing processes. These crosstalk terms beat with the desired signal, raising the background noise of the detected optical signal in the photodetector (PD) and degrading system performance.…”

A Power Balanced Dual-Wavelength Nd:GdVO4 Laser With 0.6 THz Frequency Separation

“…Since the output powers of the two wavelength components in the DWL primarily due to the wavelength dependent ECS values of the gain medium, the output power balance degree of the DWL is adjusted by the tuning the ECS spectra. Also, by considering the natural thermal characteristics of the Nd-doped vanadate crystals, the ECS spectra of the laser gain medium can be tuned by the temperature variation of the gain medium [22].…”

Frequency Difference Thermally and Electrically Tunable Dual-Frequency Nd:YAG/LiTaO3 Microchip Laser

“…Frequency difference tunable dual-frequency lasers have drawn a lot of attention in the last few years for their applications in the fields of absolute distance interferometry, Light Detection and Ranging (LIDAR) detection and terahertz wave generation [1][2][3]. In recent years, significant achievements have been made in the research of dual-frequency lasers, such as the intensity balance ratio, beat note stability and beat effect-based Q-switch regime [4][5][6]. These achievements have led to dual-frequency laser technology with a complete system and rich connotation.…”