scholarly journals Study of the Effects of Cavity Mode Spacing on Mode-Hopping in III–V/Si Hybrid Photonic Crystal Lasers

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 848
Author(s):  
Praveen K. J. Singaravelu ◽  
Sharon M. Butler ◽  
Robert N. Sheehan ◽  
Alexandros A. Liles ◽  
Stephen P. Hegarty ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Cavity Mode ◽  
Longitudinal Mode ◽  
Laser Cavity ◽  
Threshold Current ◽  
Optical Amplifier ◽  
Laser Wavelength ◽  
Single Frequency ◽  
Mode Spacing ◽  
Mode Hopping

We present a design methodology for hybrid lasers to realise mode-hop free operation by controlling the cavity mode spacing. In this study, a compact hybrid photonic crystal laser (H-PhCL) was employed which allowed a reduction of the Fabry–Perot length of the laser cavity and eliminated the need for an active mode stabilisation mechanism in order to realise mode-hop free operation. The H-PhCL was formed by butt-coupling a reflective semiconductor optical amplifier (RSOA) with a two-dimensional silicon (Si) photonic crystal (PhC) cavity. Continuous stable single frequency operation with >40 dB side-mode suppression ratio (SMSR) of the laser was achieved for gain currents of up to 100 mA, i.e., up to four times the threshold current. The shorter length of the laser cavity enabled single frequency operation due to the selection of a single longitudinal mode by the PhC narrowband reflector. Various longitudinal mode spacing regimes were studied to explain the mode-hop free characteristics of the H-PhCL. The proposed hybrid laser design methodologies can be adapted to eliminate mode-hopping in laser wavelength.

Simple wavelength pre-selection and stabilization of the single-frequency operation of a microchip laser

2013 ◽  
Vol 21 (2) ◽  
Author(s):  
A. Antończak ◽  
G. Soboń ◽  
K. Abramski
Keyword(s):  
Second Harmonic ◽  
Longitudinal Mode ◽  
Laser Cavity ◽  
Single Frequency ◽  
Simple Method ◽  
Frequency Standards ◽  
Filter Tuning ◽  
Lyot Filter ◽  
External Frequency ◽  
Selection Of

AbstractThis paper presents the concept and experimental verification of a simple method of wavelength pre-selection of a single frequency, second-harmonic generation SHG solid state laser Nd:YAG/KTP with the Lyot filter. Apart from well-known configuration of single-frequency operation, the Lyot filter to stabilization of the wavelength was used. The idea presented is based on a measurement of the losses introduced by the Lyot filter inside the laser cavity, or the maximums of laser output power as a measure of the assessment of the Lyot filter tuning to a required laser longitudinal mode, not requiring any external frequency standards. This method allows for the synthesization and stabilization of a selected wavelength from the spectrum range of the gain curve of the laser with the period determined by the “Lyot comb”. In the developed system 15 values of wavelength spaced at about 32 pm (∼ 7.9 GHz) for the infrared radiation were obtained.

Characteristic Analysis on Photonic Crystal Laser Cavity with One-Dimensional Photonic Bandgap

2012 ◽  
Vol 39 (8) ◽  
pp. 0802009
Author(s):  
冯琛 Feng Chen ◽  
冯国英 Feng Guoying ◽  
周昊 Zhou Hao ◽  
陈念江 Chen Nianjiang ◽  
周寿桓 Zhou Shouhuan
Keyword(s):  
Photonic Crystal ◽  
Photonic Bandgap ◽  
Laser Cavity ◽  
Characteristic Analysis ◽  
One Dimensional ◽  
Crystal Laser ◽  
Photonic Crystal Laser

Temperature Measurement of the Laser Cavity Based on Multi-Longitudinal Mode Laser Self-Mixing Effect

2019 ◽  
Vol 19 (12) ◽  
pp. 4386-4392 ◽  
Author(s):  
Yunkun Zhao ◽  
Junfeng Zhou ◽  
Chenchen Wang ◽  
Youze Chen ◽  
Liang Lu
Keyword(s):  
Temperature Measurement ◽  
Longitudinal Mode ◽  
Laser Cavity ◽  
Mode Laser ◽  
Mixing Effect

THERMAL EFFECTS IN VERTICAL-CAVITY SURFACE-EMITTING LASERS

1994 ◽  
Vol 05 (04) ◽  
pp. 667-730 ◽  
Author(s):  
MAREK OSIŃSKI ◽  
WŁODZIMIERZ NAKWASKI
Keyword(s):  
Thermal Modeling ◽  
Longitudinal Mode ◽  
Transverse Mode ◽  
Threshold Current ◽  
Cavity Surface ◽  
Relative Distribution ◽  
Surface Emitting Lasers ◽  
Vertical Cavity Surface ◽  
Emitting Lasers ◽  
Vertical Cavity

A comprehensive review of temperature-related effects and thermal modeling of vertical-cavity surface-emitting lasers (VCSELs) is presented. The paper is divided into two major parts. First, the effects of temperature on device characteristics are discussed, including the temperature dependence of the longitudinal mode spectra, the threshold current, the transverse-mode structure, and the output power. A new condition is formulated for thermal matching of the Bragg mirrors and the spacer region and a comparison is made between characteristic temperatures for the threshold current (T0) and for the external quantum efficiency (Tη). In the second part, various approaches to thermal modeling of VCSELs are described. Both simplified and comprehensive thermal models are considered and both analytical and numerical approaches are discussed. A new analytical approximate method for analysis of heat-flux spreading in multilayer structures is described. The most important results obtained with the aid of these models are presented. In particular, we show that the current dependence of thermal resistance is very sensitive to VCSEL structure, and is strongly influenced by the relative distribution of heat sources and their location with respect to the heat sink.

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