Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Optics was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 18.8 days and the median time to publication was 5.1 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| Abani Shankar Nayak | Kiyotaka Fujisaki |
| Abinaya Priya Venkataraman | Lakshminarayana Gandham |
| Alexander Aleksandrovich Safonov | Leonardo Chiatti |
| Andrei Afanasev | Liang Hu |
| Andrzej Kruk | Marcelo Guimarães |
| Artur Makar | Marco Battista |
| Boqiang Shen | Marco Giammarchi |
| Carlos Marques | Mariya Aleksandrova |
| Changho Lee | Marjan Kashfipour |
| Chin-Chun Tsai | Matej Njegovec |
| Cristina Moreno-Díaz | Mehmet Alp Ilgaz |
| Dariusz Kurz | Meimei Lai |
| David Baeza Moyano | Michel Darmon |
| Davide Rocco | Mircea Hulea |
| Denis Ivanov | Nozhan Bayat |
| Dmitry Makarov | Patrice Salzenstein |
| Emanuele Polino | Paulo A. Ribeiro |
| Fabio Corti | Paulo Monteiro |
| Feifei Wang | Pengfei Zhang |
| Florian Klämpfl | Reyhaneh Jannesari |
| Francesco Floris | Ricardo Rodríguez-Cielos |
| Germán F. De La Fuente | Robert Apsimon |
| Giacomo Insero | Ruchire Wijesinghe |
| Grzegorz Stepniak | Sabyasachi Barik |
| Guangju Zhang | Sasha Buchman |
| Hui Min Leung | Sergey Kobtsev |
| Ireneusz Stefaniak | Serguei Sekatski |
| Izabela Szymczak-Pajor | Shefali Saxena |
| Jean-Pierre Huignard | Ștefan Țălu |
| Jian Xu | Szymon Łoś |
| Jianming Wen | Till Leissner |
| Jose M. Cabeza-Lainez | Xinbing Song |
| José-María Sánchez-González | Xinbo Li |
| Josep Canet-Ferrer | Zhen Qiu |
| Jozwik Michal |
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