A crystal commonly utilized in lasers


1. Regularity multiplier crystal

Regularity doubling crystal is a sort of nonlinear optical crystal made use of for regularity doubling result

Fundamental buildings

(1) Without main proportion;

(2) High transparency of essential and dual frequency waves;

(3) The square nonlinear electrical polarization coefficient is large because the frequency-increasing conversion performance is proportional to the square of this coefficient;

(4) Partial matching capability, especially non-critical matching capability. Stage matching Angle and temperature resistance need to remain in;

(5) Excellent optical uniformity, high damages threshold;

(6) steady physical and chemical buildings; The development procedure is relatively simple to acquire crystals big sufficient to get to good sizes in the placement matching direction.

BBO crystal

BBO crystal is a nonlinear optical crystal with comprehensive advantages and excellent efficiency. It has an extremely broad light transmittance array, very low absorption coefficient, and weak piezoelectric ring result. Compared with other electro-optic regulated crystals, BBO crystal has a higher extinction proportion, a bigger stage sustaining duty, a higher anti-light damages limit, broadband temperature level matching, and superb optical uniformity. Improving the security of laser output power is beneficial, particularly for the three-way regularity Nd: YAG laser has many applications.

Key use BBO crystal:

(1) Used in 1064nm Nd: YAG laser with dual, triple, quadruple, and fivefold frequency.

(2) Used in color laser and titanium gem laser of dual frequency, triple regularity, amount frequency, difference frequency, and so on.

(3) For optical parametric oscillation, amplifier, and so on.

BBO switch: The electro-optical Q button made from the BBO button is often used in high repeating frequency, high power electro-optical Q-switched laser, all-solid picosecond, and femtosecond regrowth amplification systems.

Because the turn-off time of the electro-optic Q button is much shorter than the optical break time of acousto-optic Q button, therefore, the all-solid-state short-cavity Q-switched laser making use of the BBO electro-optic Q button can produce high-energy laser with pulse size less than 4ns, which is the preferred source of light of electro-optic inner carving device. BBO electro-optical Q switch can be shut off and hold up against approximately 150W of oscillating optical power in dental caries (laser result power approximately 50W) without water air conditioning.

2. Q-switched crystal

Q-tuning can be separated into energetic Q-tuning and also passive Q-tuning. In contrast, energetic Q-tuning can be divided into acousto-optical and electro-optical Q-tuning.
Frequently used passive Q-regulating crystals include co: spinel, Cr: YAG, Cr: GSGG, V: YAG, Cr: YSO, etc.

Co: MgAl2O4 is an extremely efficient saturable absorber for passive Q-switched 1.5 μm “eye safety” lasers. The peak power pulsed laser created by the passive Q-switching also has the attributes of small human eye damage, solid smoke infiltration, small transmission attenuation, and so on. It can be extensively utilized in room optical communication, battlefield quick-ranging, laser radar of unmanned equipment, and so forth.

3. Gain Medium

Gain Medium (i.e., laser working material) refers to the product system made use of to recognize the particle number inversion and create the promoted radiation amplification impact of light, often additionally referred to as laser gain medium, they can be solid (crystal, glass), gas (atomic gas, ionic gas, molecular gas), semiconductor and fluid and other media. The main demand of the laser functioning material is to achieve a large level of bit number inversion between the details power degrees of the working bits and maintain this inversion as properly as feasible in the entire laser discharge process.

To this end, it is required that the active compound have an ideal power degree framework and also shift attributes. All lasers can be separated into the following categories according to the various state of the functioning product:

(1) Strong (crystal as well as glass) laser

The working product made use of this kind of laser is made by blending steel ions which can generate promoted radiation right into the crystal or glass matrix to develop the luminescence center;

(2) Gas lasers

Use the functioning compound is gas, and according to the gas generated by the excitation of the functioning bit residential properties of the various, and also additionally divided into the atomic gas laser, ion gas laser, molecular gas laser, excimer gas laser, and so on;

(3) Liquid laser

This kind of laser utilized by the working substances mainly includes 2 kinds, one is a natural fluorescent color remedy, the other is having rare earth metal ions of inorganic substance solution, steel ions (such as Nd) play the function of working particles, and inorganic substance liquid (such as SeOCl) plays the function of the matrix;

(4) Semiconductor laser

This laser is a specific semiconductor material as the active compound to produce promoted discharge. Its principle is via a specific excitation means (electrical injection, optical pump or high-energy electron light beam injection), between the semiconductor material energy band or between the power band and the contamination degree, through the excitation of non-equilibrium provider to achieve the fragment number turnaround. Thus, a stimulated discharge of light is generated;

(5) Free electron laser

Which is a special sort of brand-new laser. The functioning product is the directional free electron beam of light moving at high speed in the space routine adjustment of electromagnetic field. As long as the speed of the cost-free electron beam can be changed to generate a tunable meaningful electromagnetic radiation, in principle, the meaningful radiation spectrum can change from the X-ray band to the microwave area, so it has a very eye-catching possibility.


It is a great 2.94 μm laser crystal, extensively used in laser clinical systems and other areas. Er: YAG crystal is one of the essential functioning materials of 3mm laser, and also has the characteristics of high incline effectiveness, can work at room temperature laser, laser wavelength within the secure range of human eyes, and so on 2.94 mm Er: YAG laser has been widely made use of in the medical area of surgery, cosmetic dermatology, dentistry as well as other treatments.


1. High incline efficiency

2. Work at an area temperature level

3, the laser functioning wavelength is fairly secure for human eyes

Ti sapphire

Ti-doped sapphire (Ti3+: Al2O3) crystal is the most extensively used tunable laser solid material, with exceptional laser qualities– large exhaust transmission capacity (0.65 ~ 1.2 μm), exceptional thermal, optical, physical, chemical, and also mechanical properties. Titanium sapphire lasers and their laser systems are unrivaled in their extraordinary efficiency and the resulting variety of applications, such as proton treatment, accelerator physics, nuclear physics, infrared spectroscopy, and material characterization.

Erbium glass

Laser glass is a type of solid laser material based on glass. It is extensively used in different kinds of solid-state laser light and has become the primary laser product of high-power and high-energy lasers.

The attributes of using glass as a laser working things are that it can commonly alter the chemical makeup and manufacturing process to obtain many crucial residential properties, such as fluorescence, high thermal security, low thermal expansion coefficient, negative temperature level refraction coefficient, high optical uniformity, as well as simple to obtain a range of shapes and sizes, low cost, and so on.

Laser glass is a crucial core material for high-power laser devices due to its large size, good optical uniformity, affordability, and high production efficiency.

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