Determining which country is the most powerful in laser weapons is a complex matter, as it involves evaluating various factors such as technological advancements, research and development capabilities, military investments, and the diversity and sophistication of laser weapon systems.

Several countries around the world have made significant progress in laser weapon technology. The United States, China, Russia, and other major military powers have all invested heavily in laser weapon research and development.

The United States, for example, has a long history of laser weapon development and has made significant advancements in areas such as directed-energy weapons and laser-based countermeasures. The US military has tested various laser weapon prototypes and is actively exploring their potential applications.

China has also emerged as a major player in laser weapon technology. The country has made significant investments in laser research and development and has reportedly tested laser weapons on various platforms, including aircraft, ships, and ground vehicles.

Russia, too, has a strong laser weapon program and has developed several prototypes. The country's laser weapons are designed to counter optical sensors, disrupt enemy electronics, and potentially damage targets.

Other countries, such as Israel, India, and South Korea, have also made progress in laser weapon development, but may not be on the same level as the United States, China, and Russia.

In conclusion, it is difficult to definitively state which country is the most powerful in laser weapons, as it depends on a variety of factors. However, it is clear that the United States, China, and Russia are among the leading countries in laser weapon technology, with significant investments and advancements in this field.