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YCOB crystal is one of the most widely used nonlinear optical
crystals. Its nonlinear optical coefficient is equivalent to that
of BBO crystal and LBO crystal. The effective frequency
multiplication coefficients of the second and third order reach 2,
8 and 1, 4 times of KDP respectively.The YCOB crystal has the
following advantageslarge aperture, high damage intensity in
femtosecond regime,about2000-2500GW/cm2 wide allowable Angle range
and allowable temperature range,small dispersion Angle, shorter
growth period by Cz method.At the same time, it has stable physical
and chemical properties (non-deliquescent) and good machining
properties. Therefore, it is considered to have good application
prospects of blue-green light and UV band optical frequency
multiplier crystal.
YCOB (YCa4O(BO3)3, Yttrium Calcium Oxyborate)—Nonlinear crystal
considered to have good prospects of UV band optical frequency
multiplier
One of the latest technical achievements connected with YCOB is the generation of 2.35-W CW green output ( = 532 nm) in a 1.2-cm-long crystal ( = 64.5, =35.5) via inter cavity SHG of a diode-array end-pumped Nd:YVO4 laser (P = 5.6W). Another similar application is THG of NdYVO4 laser radiation. Using the KTP crystal for frequency doubling and a 1.1-cm-longYCOB crystal ( = 106, =77.2), the authors managed to obtain 124mW of quasi-CW light (pulse repetition frequency 20 kHz) at 355 nm.
Chemical and Physical properties
| Crystal Structure | Monoclinic, Point group m |
| Lattice Parameter | a=8.0770 , b=16.0194 , c=3.5308 , =101.167, Z=2 |
| Melting Point | About 1510C |
| Mohs Hardness | 6~6.5 |
| Density | 3.31 g/cm3 |
| Thermal Conductivity | 2.6 W/m/K (||X), 2.33 W/m/K (||Y), 3.1 W/m/K (||Z) |
| Orientation Tolerence | < 0.5° |
| Thickness/Diameter Tolerance | ±0.01 mm |
| Surface Flatness | </8 @632nm |
| Wavefront Distortion | </4 @632nm |
| Surface Quality | 10/5 |
| Parallel | 30 |
| Perpendicular | 15 |
| Clear Aperture | >90% |
| Chamfer | <0.2×45° |
| Interacting wavelengths[m] | pm [deg] | pm [deg] |
| XY plane, =90° | ||
| SHG,o+o e | ||
| 1.06420.5321 | 35 | |
| 0.73790.36895 | 77.3 | |
| SHG, type I, along Y | ||
| 0.7240.362 | 90 | |
| SFG, o+o e | ||
| 1.0642+0.53210.3547 | 73.4/74.8/75.2/75.3 | |
| SHG, type II, along Y | ||
| 1.030.515 | 90 | |
| SFG, e+o e | ||
| 1.9079+1.06420.6831 | 81.2 | |
| YZ plane, =90 | ||
| SHG, e+e o | ||
| 0.73790.36895 | 66.9 | |
| SFG, e+e o | ||
| 1.0642+0.53210.3547 | 58.7/59.7/59.8/59.9 | |
| SHG, e+o o | ||
| 1.06420.5321 | 58.7/51.1/62.7 | |
| SFG, e+o o | ||
| 1.9079+1.06420.6831 | 73.5 |
