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Yb CALGO Yb-doped CaGdAlO 4  crystal (Yb:CALGO) is now recognized to exhibit outstanding properties for the production of high-power and ultra-short laser pulses. It has the broad and smooth emission bandwidth to generate very short pulses (<100 fs). Additionally its’ high thermal conductivity make it is able to hold high power pumping(2 at. % Yb:CALGO thermal conductivity to be 6.9 and 6.3 WK −1  m −1  along the a and c axis); The generation of both very short pulse and high average power femtosecond oscillators has been demonstrated Yb:CaGdAlO 4  (Yb:CALGO)- Yb doped crystals for high power and ultrashort(femtosecond) lasers Yb 3+ :CaGdAlO4 has been recently demonstrated to be very interesting for the development of diode–pumped short-pulsed modelocked lasers. Compared with Ti: Sapphire crystal（the choice for the development of ultrashort laser system producing very short and powerful pulses using the Chirped Pulse Amplification technique，Since the beginning of the 90’s）,Yb

Yb：KGW With the emergence of laser diode as the preferred pump source for inertial confinement fusion and the application and development of Yb 3+  laser materials in communication and military, the research on Yb 3+  laser materials will reach a climax. Yb 3+ : KGd(WO 4 ) 2  (Yb:KGW) is one of the most promising laser active materials. Yb:KGW crystal is expected to replace Nd:YAG crystal and Yb:YAG crystal in high power diode pumped laser system. Yb:KGW also has great potential for high power, short pulse time femtosecond lasers and their wide application. Yb 3+ :KGW has large absorption coefficient, low quantum defect, high absorption and emission cross section The simple two-level electronic structure of the Yb ion avoids undesired loss processes such as upconversion, excited state absorption, and concentration quenching. Compared to the commonly used Nd:YAG crystal, Yb:KGW crystal has a much larger absorption bandwidth, 3 or 4 times longer emission lifetime in similar hosts

RTP RbTiOPO 4 (RTP) crystal is a kind of nonlinear optical crystal material with excellent comprehensive properties. RTP is currently the most commonly used type of practical electro-optic crystals with high frequency repetition, high power and narrow pulse width laser Q switching. RTP electro-optical devices are not only used in laser micromachining and laser ranging, but also in major scientific exploration projects because of their excellent comprehensive performance. RbTiOPO 4 (RTP)—a crystal with large nonlinear optical coefficient, large electro-optical coefficient, high photoresist damage threshold and stable physical and chemical properties The growth temperature ranges from 950 °C to 800 °C and the growth period is usually between 45 and 60 days.As RTP is transparent from 0.4 to 3.5 μm, it can be used in multiple types of laser such as Er:YAG laser at 2.94 μm with fairly good efficiency. Bulk absorption measurements at 1.064 μm range from 50 to 150 ppm using Phototherma

Nd：KGW Nd:KGW crystal is a kind of laser crystal that can realize high concentration doping.Because the crystal can be mixed with high concentrations of Nd ions and has a large emission area, its monopulse and low-repeat laser performance is better than Nd: YAG. The absorption band of Nd: KGW crystal is at 808 nm, which can effectively couple with LD pump source (emitting wavelength is 808 nm) to improve its luminous efficiency. Moreover, its half height and width of 12 nm makes it able to accommodate the drift of LD emission wavelength with temperature, which is conducive to conducting diode pumped KGw laser experiment and device research. Nd:KGW can not only realize free oscillation, Q switching, mode locking operation, but also realize Raman conversion. Nd:KGW crystal—A crystal can be generated from excited Raman scattering and become a multi-wavelength light source in visible band after frequency doubling. The Raman characteristics of Nd:KGW crystal depend on its high excite

KTP Nonlinear optical crystal KTiOPO 4  (KTP) has excellent frequency doubling performance: large nonlinear coefficient, no delixation, optical damage threshold up to GW/cm 2 , and little change of phase matching condition with temperature. According to practical experience, crystals with large nonlinear coefficients often have excellent electro-optical properties. The successful development of low conductivity KTP crystal by molten salt method has greatly promoted the practical application of KTP electro-optic devices, especially in the field of high-frequency modulation. KTP Electro-optical Q-switch Crystal—a crystal having a high electrooptic coefficient, a low dielectric constant, and capable of operating at high frequencies The dielectric constant ε 22  of KTP varies little with frequency and is not affected by the electric coupling effect under pressure. ε 33  varies greatly with frequency and is not affected by the electrical coupling effect under pressure. Especially at

KNbO3 The solid-state blue-green laser has stable performance, compact structure and integrability, which makes it has a good application prospect in optical storage, optical communication and laser medical instrument, etc. It is a research hotspot in the world at present. A feasible way to achieve this goal is to realize blue and green light output by semiconductor near infrared laser frequency doubling. Currently, the crystal that can octave the semiconductor near infrared laser frequency is potassium niobate (KNbO 3 ). KNbO 3  is an interesting nonlinear material for optical and electro-optical applications. Second-harmonic generation, sum frequency mixing, and optical parametric oscillation are important processes for converting available laser wavelengths into the blue-green and the near-IR spectral regions. Non-linear crystal KNbO 3  for second-harmonic generation of near infrared pulsed laser light KNbO 3  crystal is an oxygen octahedra ferroelectric with perovskite struc

Cr：GSGG Gadolinium scandium gallium garnet(GSGG) codoped with Cr is a laser material with high efficiency. An electro-optic shutter element was first utilized to provide Q-switched operation of the ruby laser. Passive Q-switched ruby lasers were achieved with saturable dye absorbers and colored glass (compounds of selenium and cadmium sulfide. Recently the operational characteristics of a dye Q-switch for a pulsed ruby laser was still studied for application in underwater holography. However, the dye Q-switch was limited in durability because of degradation (decomposition) of the dyes and the glass Q-switch was readily damaged. Thus, the tetravalent chromium doped gadolinium scandium gallium garnet Gd 3 Sc 2 Ga 3 O 12  (Cr 4+ : GSGG) passive Q-switch ruby laser-offers for the first time high reliability, durability and high efficiency. Cr:GSGG crystal—a crystal which shows high efficiency and high reliability. Cr 4+ : GSGG has been utilized for the first time to provide a satura

CLBO All-solid-state ultraviolet lasers have been widely used in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of small volume, long life, high efficiency, good beam quality, wide tuning and narrow spectral line, etc. Utilizing high power near-infrared coherent light source as the fundamental frequency source based on nonlinear tuning technology, generating ultraviolet coherent radiation by multistage frequency conversion is regarded as an important way to develop the ultraviolet coherent light source. The key problem of ultraviolet coherent light source mainly focuses on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is one of the conditions for frequency transformation, so the growth, size, damage resistance, conversion efficiency and allowable parameter range of nonlinear optical crystal are required more and more. Non-linear crystal CLBO  for  frequency