Locking laser

honggarae 28/01/2023 341

Introduction

Application Area (4)

If no choice device is added in the laser resonant cavity, then the laser output line It is composed of many spectrums that are discrete, and horizontally and horizontally. The laser transition line width limits the number of oscillation modes with sufficient gain to a certain amount. Only those of the gain of the laser medium exceed the wavelength of the resonant cavity to form laser radiation. The line characteristics of the laser light are typically described using terms such as bandwidth longitudinal model and coherent length. In the free operation of the laser, the longitudinal mode and the cross-mold are simultaneously oscillated without any fixed amplitude and phase relationship, and the output of such a laser is averaged at average. In the general resonant cavity, there are hundreds of gains in the laser medium larger than the longitudinal molds in the range of resonant cavity. In the frequency domain scope, the laser radiation consists of a line of a plurality of longitudinal modes of longitudinal modules C / 2L. These modes are oscillated with each other, and their phase is randomly distributed between 1 π to ten π. Its time domain output features Similar to thermal noise. However, if the phase relationship between the oscillation mold is forced to remain fixed, the laser output will vary in fully determined form. At this time, we said that the laser is a lock or lock.

The output of the lock laser is a Gaussian distribution (frequency to amplitude), and the phase is exactly the same. In the time domain, the laser output is a Gaussian pulse string, so the locking die is equivalent to the amplitude and phase of the line.

Molding Classification

Active lock mode: periodic modulated resonant cavity loss or optical range N

Locking laser

passive lock mode: utilizing a saturable absorber Nonlinear absorption characteristics, the absorption of the inner laser light is

self-locking mold varied as the intensity of the light field: the nonlinear effect of the activation medium itself can maintain equal interval distribution of each longitudinal mode frequency, and Determined primary phase relationship

Synchronous pump lock: periodic modulated resonant cavity gain

type

(1) Picosecond laser seed source: output Wavelength: 1064 nm, repetition frequency: MHz, beam mode, pulse width: PS, laser hair angle, average power: MW, good pulse consistency, single pulse energy: NJ

(2) tile Picosecond laser oscillator: output wavelength: 1064 nm (multiplier), repetition frequency: MHz, pulse width: PS, average power: W single pulse energy: NJ