This video by the Canadian physicist Dr. David E. Hinton was a great way for me to get more familiar with the physics behind chirped pulse amplification. It provided a fascinating context for the chirp, which was interesting enough to have me re-watching it a second time. I always enjoy the physics lessons and how the chirp is actually a pulse to a chirp.
I’m really glad that there’s a video out there that explains the physics behind chirped pulse amplification, and it’s great to see that physics is important to other scientists too. I’m hoping that this video helps others to understand chirped pulse amplification and how it works.
The chirp is a kind of pulse to a chirp (which is just a pulse to a pulse), and the chirp itself is a pulse to a chirp. So you get a chirp pulse to a chirp pulse, which is the result of the chirp being a pulse to another pulse. Chirp pulses are pretty tricky to make in real life, because they require that you apply a lot of energy to the chirp.
Chirped pulse amplification is a process that’s been in existence for a long time. And in fact, that’s one of the reasons why we know so much about it. If you’d asked me 10 years ago about chirped pulse amplification, I would have told you that you couldn’t make a chirp pulse that way. And you can’t, except you can make it using a lot of super-fast lasers.
The process of making chirped pulse amplification is rather complicated. The idea is simple. When a pulse is sent out, the original pulse is slowed down. This can be done by slowing down the pulse itself, by slowing it down with a high-speed laser. If you then add a second pulse to the system, this will also be slowed down. The problem is that you have to slow down a lot of pulses before you can even get them to agree to chirp.
And if you’re already getting a lot of chirping pulses to agree to chirp, it’s probably a good idea to slow down your lasers, too. Otherwise, the pulses could chirp and collide and start a whole new cycle of chirping.
This is part of the reason why we use a laser to detect chirps. The problem is that this makes chirps very hard to detect. One of the reasons why high-speed laser pulses have been so hard to detect is because of chirping. The way pulses are modulated is that they are all the same frequency, which means that each pulse has the same time duration.
This is why most of the chirping in laser systems has been discovered by people who also designed the laser. Because lasers have a limited number of pulse frequencies, a lot of the pulses that are being chirped are chirped on the same frequency. To detect chirps, we use a laser with many lasers, each one with a different chirp rate. These chirps will be spread out over many pulses.
While chirping is definitely one way to detect a chirp, many chirping systems have been designed and developed to detect a whole other thing – which is the chirp itself. In chirping systems, the chirp rate is proportional to the power of the laser. To detect the chirp, we make the laser pulse longer and use the fact that two pulse lengths give the same chirp rate.
In the first day of 2018, a team of Canadian physicists (including the chirp pioneer, Dr. Andrew Bennett) worked together to develop a chirp detection system. It’s essentially a laser pulse of variable length that also has an amplifier. When the pulse hits a target, the amplifier pumps more power into the laser, which amplifies the pulse. By measuring the amplitude of the pulse, we can then tell which chirp rate we’re dealing with.