A laser operating under these conditions will emit over several different frequencies due to the rapid modulation of the modulator.

Mode locking 원리. 2 광자결정에서의 빛의 전파와 특성 3 광자결정의 응용 분야 2가지 이상 11. Mode locking is a technique in optics by which a laser can be made to produce pulses of light of extremely short duration on the order of picoseconds 10 12 s or femtoseconds 10 15 s. 2 모드록킹 mode locking 의 원리와 short pulse 발생 방법 3 모드록킹을 응용한 fs pulse 발생 방법 10. They are also imposed by the optical cavity spaced out by.

Mode locking is the most important technique for generating pulses with picosecond and femtosecond durations. A laser operated in this way is sometimes referred to as a femtosecond laser for example in modern refractive surgery the basis of the technique is to induce a fixed phase relationship between the. Photonic crystals 광자결정 선하종 1 광자결정이란. Chapter 5 active mode locking forsimplicity we assume that the laser operates inthe transverse fundamen tal modes and therefore we only have to treat the longitudinal modes of the laser similar to a simple plane parallel fabry perot resonator figure.

Cw 다이오드레이저로 펌핑되는 고체레이저는 q 스위칭 장치를 내장하면 펌핑이 연속적으로 이루어지더라도 매우 짧은 펄스폭을 갖는 주기적인 펄스출력을 얻을 수 있습니다. Mode locked lasers produce pulses at a high repetition rate and with average powers of 1 100 w which is the high repetition rate necessary to support mode locking limits the energy per pulse to tens or hundreds of nanojoules.

For some mostly scientific applications it is desirable to have millijoule or even joule level energies with peak powers of hundreds of megawatts up to a petawatt. When a laser is mode locked one or sometimes several pulses are circulating in the laser resonator. We consider one polarization of the field only however as we will say later for some mode locked laser polarization dynamics will.

The term mode locking comes from the analysis of the various frequencies. The longitudinal modes of the cavity. Each time the pulse hits the output coupler mirror a part of its energy is emitted so the laser output is a regular pulse train. The case of a single pulse is most common.

Active mode locking involves the periodic modulation of the resonator losses or of the round trip phase change achieved e g.