Ultra-narrow linewidth DFB-laser with optical feedback from a monolithic confocal Fabry-Perot cavity
![Figure 2 from 4.6 nm Mode-Hop-Free Tunable DFB Laser with High Coupling Coefficient Gratings | Semantic Scholar Figure 2 from 4.6 nm Mode-Hop-Free Tunable DFB Laser with High Coupling Coefficient Gratings | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/bde77142b64b0356ef7690c3aec1154d9e6ab782/2-Figure2-1.png)
Figure 2 from 4.6 nm Mode-Hop-Free Tunable DFB Laser with High Coupling Coefficient Gratings | Semantic Scholar
![GaN-based DFB laser diodes with 10th-order laterally coupled surface gratings | Ferdinand-Braun-Institut GaN-based DFB laser diodes with 10th-order laterally coupled surface gratings | Ferdinand-Braun-Institut](https://www.fbh-berlin.de/fileadmin/_processed_/7/f/csm_Fig.2_emission_spectrum_LC-DFB_LD_51b4c03148.jpg)
GaN-based DFB laser diodes with 10th-order laterally coupled surface gratings | Ferdinand-Braun-Institut
![Figure 3 from Multiple wavelength DFB laser arrays with high coupling coefficient and precise channel spacing | Semantic Scholar Figure 3 from Multiple wavelength DFB laser arrays with high coupling coefficient and precise channel spacing | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/8e4f75c26ecaf7b9f2a6d82ba25cd98ba9472764/3-Figure3-1.png)
Figure 3 from Multiple wavelength DFB laser arrays with high coupling coefficient and precise channel spacing | Semantic Scholar
![a) The optical spectrum of the two-section DFB laser working in the... | Download Scientific Diagram a) The optical spectrum of the two-section DFB laser working in the... | Download Scientific Diagram](https://www.researchgate.net/publication/336883612/figure/fig3/AS:830646104637441@1575052872149/a-The-optical-spectrum-of-the-two-section-DFB-laser-working-in-the-dual-mode-state.jpg)
a) The optical spectrum of the two-section DFB laser working in the... | Download Scientific Diagram
![Optical spectrum of a DFB laser. The wavelength is centered at 782.8nm.... | Download Scientific Diagram Optical spectrum of a DFB laser. The wavelength is centered at 782.8nm.... | Download Scientific Diagram](https://www.researchgate.net/publication/228940084/figure/fig1/AS:668995741028354@1536512422068/Optical-spectrum-of-a-DFB-laser-The-wavelength-is-centered-at-7828nm-The-side-mode.png)
Optical spectrum of a DFB laser. The wavelength is centered at 782.8nm.... | Download Scientific Diagram
![Top: output spectrum of DFB laser from front end. Below: corresponding... | Download Scientific Diagram Top: output spectrum of DFB laser from front end. Below: corresponding... | Download Scientific Diagram](https://www.researchgate.net/publication/224435570/figure/fig1/AS:401171559796737@1472658161118/Top-output-spectrum-of-DFB-laser-from-front-end-Below-corresponding-spectrum-from-back.png)
Top: output spectrum of DFB laser from front end. Below: corresponding... | Download Scientific Diagram
![Advanced distributed feedback lasers based on composite fiber heavily doped with erbium ions | Scientific Reports Advanced distributed feedback lasers based on composite fiber heavily doped with erbium ions | Scientific Reports](https://media.springernature.com/full/springer-static/image/art%3A10.1038%2Fs41598-020-71432-w/MediaObjects/41598_2020_71432_Fig1_HTML.png)