One-thousandth-level Laser Power Stabilizationbased on Optical Feedback from a Well-designedHigh-split-ratio and Non-polarized Beam Splitter

2021 ◽  
Author(s):  
Jie Wang ◽  
Guangyao Huang ◽  
Guochao Wang ◽  
YaNing Wang ◽  
Mei Hu ◽  
...  
Keyword(s):  
Laser Power ◽  
Beam Splitter ◽  
Optical Feedback ◽  
Split Ratio ◽  
Level Laser ◽  
Polarized Beam

scholarly journals Control of Timing Stability, and Suppression in Delayed Feedback Induced Frequency-Fluctuations by Means of Power Split Ratio and Delay Phase-Dependent Dual-Loop Optical Feedback

2021 ◽  
Vol 11 (10) ◽  
pp. 4529
Author(s):  
Haroon Asghar ◽  
John G. McInerney
Keyword(s):  
Coupling Strength ◽  
Optical Feedback ◽  
Fine Tuning ◽  
Split Ratio ◽  
Optical Delay ◽  
Quantum Dash ◽  
Power Split ◽  
Frequency Fluctuations ◽  
Mode Locked Lasers ◽  
Delayed Optical Feedback

We experimentally demonstrated a power split ratio and optical delay phase dependent dual-loop optical feedback to investigate the suppression of frequency-fluctuations induced due to delayed optical feedback. The device under investigation is self-mode-locked (SML) two-section quantum-dash (QDash) laser operating at ∼21 GHz and emitting at ∼1.55 m. The effect of two selective combinations of power split ratios (Loop-I: −23.29 dB and Loop-II: −28.06 dB, and Loop-I and Loop-II: −22 dB) and two optical delay phase settings ((i) stronger cavity set to integer resonance and fine-tuning the weaker cavity, (ii) weaker cavity set to integer resonance and fine-tuning of stronger cavity) on the suppression of cavity side-bands have been studied. Measured experimental results demonstrate that delayed optical feedback induced frequency-fluctuations can be effectively suppressed on integer resonance as well as on full delay range tuning (0–84 ps) by adjusting coupling strength −22 dB through Loop-I and Loop-II, respectively. Our findings suggest that power split ratio and delays phase-dependent dual-loop optical feedback can be used to maximize the performance of semiconductor mode-locked lasers.

scholarly journals Polarization-Insensitive Beam Splitter with Variable Split Angles and Ratios Based on Phase Gradient Metasurfaces

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 113
Author(s):  
Quan He ◽  
Zhe Shen
Keyword(s):  
Beam Splitter ◽  
Optical Systems ◽  
Critical Element ◽  
Phase Gradient ◽  
Beam Splitters ◽  
Split Ratio ◽  
Integrated Optical ◽  
Gradient Based ◽  
Polarization Insensitive ◽  
Easy Integration

The beam splitter is a common and critical element in optical systems. Traditional beam splitters composed of prisms or wave plates are difficult to be applied to miniaturized optical systems because they are bulky and heavy. The realization of the nanoscale beam splitter with a flexible function has attracted much attention from researchers. Here, we proposed a polarization-insensitive beam splitter with a variable split angle and ratio based on the phase gradient metasurface, which is composed of two types of nanorod arrays with opposite phase gradients. Different split angles are achieved by changing the magnitude of the phase gradient based on the principle of Snell’s law of refraction, and different split ratios are achieved by adding a phase buffer with different areas. In the designed four types of beam splitters for different functions, the split angle is variable in the range of 12–29°, and the split ratio is variable in the range of 0.1–1. The beam splitter has a high beam splitting efficiency above 0.3 at the wavelength of 480–600 nm and a weak polarization dependence. The proposed beam splitter has the advantages of a small size and easy integration, and it can be applied to various optical systems such as multiplexers and interferometers for integrated optical circuits.

An infrared light polarized beam splitter based on graphene array

2016 ◽  
Author(s):  
Dingbo Chen ◽  
Junbo Yang ◽  
Jingjing Zhang ◽  
Wenjun Wu ◽  
Jie Huang ◽  
...  
Keyword(s):  
Beam Splitter ◽  
Infrared Light ◽  
Polarized Beam

scholarly journals Experimental realization of a 2 × 2 polarization-independent split-ratio-tunable optical beam splitter

2016 ◽  
Vol 24 (25) ◽  
pp. 28519 ◽  
Author(s):  
Ran Yang ◽  
Jian Li ◽  
Xiao-Bo Song ◽  
Ting Gao ◽  
Yi-Ran Li ◽  
...  
Keyword(s):  
Beam Splitter ◽  
Optical Beam ◽  
Experimental Realization ◽  
Split Ratio ◽  
Polarization Independent

Calorimeter with compensative absorber for measuring mu W level laser power

2002 ◽  
Author(s):  
Y. Suzuki ◽  
A. Murata ◽  
M. Araragi ◽  
T. Inoue
Keyword(s):  
Laser Power ◽  
Level Laser
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