Generation and Thermal Properties of a Dual-Transverse-Mode With Dual-Polarization and Dual-Frequency by a Dual-Medium Microchip Laser

Zilong Zhang,Kun Gui,Yuxiao Xing,Changming Zhao,Haiyang Zhang

doi:10.1109/jphot.2019.2934637

Zilong Zhang, Kun Gui + Show 3 more

Open Access

https://doi.org/10.1109/jphot.2019.2934637

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Journal: IEEE Photonics Journal	Publication Date: Oct 1, 2019
Citations: 1	License type: CC BY 4.0

Affiliation: Beijing Institute of Technology

Abstract

A dual-polarization, dual-frequency and dual-transvers-mode laser beam is generated by a dual-medium microchip laser. The dual-transvers-mode includes a linearly polarized LG01 mode and a perpendicular polarized TEM00 mode, which have different optical frequencies. How is the beat frequency of the dual-mode influenced by the thermal factors, including cooling temperature of birefringent crystal and thermal effect of gain medium, is experimentally investigated and theoretically analyzed. These studies offer an extension and better understanding of the dual-medium based dual-frequency laser, which is of important applications in coherent Lidar detection and optical communications.

Highlights

Microchip laser is convenient to achieve single mode oscillation due to its pretty short cavity [1], [2]
An interesting phenomenon of this dual-medium microchip laser (DMML) mechanism is that a dark hollow beam (DHB) can be directly obtained along with a perpendicular polarized TEM00 mode, which would be shown in this paper
The heat sink is attached with a Thermo Electric Cooler (TEC), which is modulated by a temperature controller with accuracy of 0.01 °C.The output dual-frequency laser of the DMML is separated by a polarization beam splitter (PBS, the polarization ratio is better than 1000:1 at 1064 nm)

Summary

Introduction

Microchip laser is convenient to achieve single mode oscillation due to its pretty short cavity [1], [2]. To generate large frequency difference in the order of GHz or tens of GHz, a simple mechanism design is a dual-crystal-chip stacked cavity, where one crystal chip serving as the gain medium and the other is a birefringent one serving as the generator of the dual frequency with perpendicular polarizations [6]. To distinguish the latter dual-frequency microchip cavity from the single crystal one, the two crystal based dual-frequency microchip laser can be named as dual-medium microchip laser (DMML).

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Results

Conclusion