Comparison of diode-side-pumped
Nd:YAG and Nd:YAP laser
Jan Šulca , Helena Jelínkováa , Jan K. Jabczyńskib
Waldemar Żendzianb , Jacek Kwiatkowskib , Karel Nejezchlebc , Václav Škodaca Czech Technical University, Faculty of Nuclear Sciences and Physical EngineeringBřehová 7, 115 19 Prague 1, Czech Republicb Military University of Technology, Institute of Optoelectronics

Kaliskiego Str. 2, 00 908 Warsaw, Polandc Crytur, Ltd. Turnov, Palackého 175, 511 01 Turnov, Czech Republic

ABSTRACT
Nd:YAG and Nd:YAP slab crystal in the form of triangle with the Brewster-angle-cut polished input faces wasused as an active medium for diode-side-pumped laser. A horizontal projection of the active medium form is atriangle with 19.22 mm long base, 5 mm height, and thickness of 4 mm. This active crystal shape is one from thesimplest form which makes possible to realise a slab side-pumped configuration with a total internal reflection.
Optical pumping was accomplished by a quasi-cw diode ARR18P400 with peak power 400 W closely attached tothe active crystal without any coupling optics. Both material were operated for most known Nd3+ ion transition
4
F3/2 → 4 I11/2 (1 µm) as well as for transition 4 F3/2 → 4 I13/2 which leads to the emission at 1.3 µm. The
systems were tested in free running and Q switch regime. This system is enough compact to be useful tools for
direct medical application.
Keywords: Nd:YAP, Nd:YAG, slab, Q-switching, LiF:F−
2 , V:YAG

1. INTRODUCTION
For the purpose of various applications (industry, medicine, military. . . ) all-solid-state high-power and highenergy diode pumped laser systems are requested. The energy limit for these lasers is done primary by the active
medium volume, active ions concentration and possibility of pumping. Significant influence on generated energy
and mean power have also a heat sink possibilities required to dissipate heat generated in the active medium.
The thermal gradients in the laser active medium are responsible for the optical and mechanical distortion which
includes thermal focusing, stress induced biaxial focusing, and stress induced birefringence. These thermallyinduced effects degrade the optical quality of the active medium and limit the laser output mean power. One ofthe possibilities how decrease the unfavorable influence of the thermal gradients is proper choice of the active
medium material, shape and heat sink geometry. From this reason many concepts of the solid-state active media
form were proposed and experimentally investigated.1 The cylindrical shape of the active medium can be, forthe purpose of high energy and high mean power output, changed to a slab or disc concept. In the design ofthe slab the generated laser radiation can be directed along longitudinal axes of the active medium or along the“zig-zag” path – the laser beam traverses the slab using total internal reflection from the slab side faces.2, 3 Allthese systems were used for flashlamp pumping and similarly for diode pumping.4, 5 Especially for diode side
pumped lasers various forms of the active media were used as for example triangle,6 brick,7, 8 or pentagonal9
shapes. The trigonal form of active medium follows the zig-zag slab system: it is slab with one internal reflection
Further author information: (Send correspondence to J.Š.)J.Š.: E-mail: sulc@troja.fjfi.cvut.cz, Tel.: +420 221 912 240, Fax: +420 221 912 252
H.J.: E-mail: hjelin@troja.fjfi.cvut.cz, Tel.: +420 221 912 243, Fax: +420 221 912 252
J.J.: E-mail: jjabczynski@wat.edu.pl, Tel.: +48 226 859 678, Fax: +48 226 668 950
K.N.: E-mail: nejezchleb@crytur.cz, Tel.: +420 481 319 511, Fax: +420 481 322 323
V.Š.: E-mail: skoda@crytur.cz, Tel.: +420 481 319 511, Fax: +420 481 322 323

only. This arrangement is very convenient for diode side pumping and in comparison with brick system, theresonator with the trigonal active medium has convenient linear form.
In our previous work10–12 the trigonal Nd:YAG slab crystal was used together with the BaWO4 Raman
crystal for generation of Stokes shifted laser radiation with wavelength 1170 nm. As continuation of this research,
Nd:YAP triangle was prepared and the characterization of this material was performed in the same system
together with the previously tested Nd:YAG crystal to compare this two materials.

2. MATERIALS AND METHODS
2.1. Laser Active Medium
As an active medium of constructed slab lasers two similar materials were compared: Nd doped YAG (yttrium
aluminium garnet) and YAP (yttrium aluminium perovskite, also called YALO). In fact both of this matrices
are from one physical-chemical system Y2 O3 –Al2 O3 and also physical properties like melting point, hardness,thermal conductivity, etc. are quite similar.13 The main difference between this two material is that cubic YAG
is an isotropic crystal, while rhombic YAP crystal is anisotropic and its anisotropy is reflected also in its spectral
properties. Thus Nd:YAP crystal orientation can be chosen for higher gain and low threshold or, alternatively,
for low gain and high energy storage required for Q-switching.14 Also it is well known that in the anisotropic
material like Nd:YAP thermally-induced birefringence effects can be greatly reduced.1
Solid state lasers based on this materials are very common because of their simple construction, reliability
and large variability. The main properties of this Nd-doped laser crystals are listed in Table 1. In this tablecorresponding laser channels for Nd3+ ion in both crystalline latices are noted to explain observed simultaneous
dual wavelength emission corresponding with Nd3+ transition 4F3/2 → 4I13/2 in garnet.
Table 1. Comparison of Nd3+ :YAP & Nd3+ :YAG chosen physical properties.

Nd:YAG

Nd:YAP

Neodymium doped yttrium
aluminium garnet
Nd3+ :Y3 Al5 O12

Neodymium doped yttrium
aluminium perovskite
Nd3+ :YAlO3

Isotropic medium

Anisotropic mediumn = 1.816

0.13 W.cm−1 .K−1

na = 1.929
nb = 1.943
nc = 1.952
0.11 W.cm−1 .K−1

Nd3+ doping level

1 at. %

1 at. %

Pumping wavelength

808 nm803 nmFull nameChemical formula
Refractive index(λ = 1.06 µm)
Thermal conductivity

Ref.13

Ref.13
Producer data

4.8 cm−1 (@ 803 nm)

Measured258 ± 3 µs

156 ± 1 µs

Measured

Laser transition
4
F3/2 → 4I11/2

λ = 1064.2 nm(σe ∼ 71 × 10−20 cm2 )λ = 1064.6 nm(σe ∼ 17 × 10−20 cm2 , kkc)

Ref.13, 15

Laser transition
4
F3/2 → 4I13/2

λ = 1077.9 nm(σe ∼ 12 × 10−20 cm2 )λ = 1318.4 nm(σe ∼ 15 × 10−20 cm2 )λ = 1079.6 nm(σe ∼ 46 × 10−20 cm2 , kkb)
λ = 1317.5 nm(σe ∼ 0.5 × 10−20 cm2 , kkc)

λ = 1338.1 nm(σe ∼ 15 × 10−20 cm2 )λ = 1341.6 nm(σe ∼ 22 × 10−20 cm2 , kkb)

Absorption coefficient
4

Lifetime at level F3/2

4.3 cm−1

Note(@ 808 nm)

Ref.13, 15, 16

2.1.1. Active Medium Geometry
The active medium in the form of isosceles triangle was used. Dimensions of tested Nd:YAG and Nd:YAP crystal
cuts are evident form Figures 2 and 1. It is seen that the dimensions of tested samples are not exactly the same.
The main difference is in thickness of crystals (Nd:YAP crystal is about 1 mm thicker than Nd:YAG crystal).
Sideways paths of triangle are polished and by these sides propagates the generated radiation. The oscillating
laser radiation is entering into the crystal under Brewster angle, so the horizontal part of the polarization istravelling without losses.

Figure 1. Diagram of the Nd:YAG triangle crystal dimensions.

Figure 2. Diagram of the dimensions and crystallographic orientation of Nd:YAP triangle crystal.

The horizontally polarized pumping radiation is entering into the crystal through the basis of triangle (Figure 3). In Nd:YAP crystal the propagation of pumping radiation corresponds with c-direction. The pumping
radiation is absorbed in the laser crystal in the place of internal total reflection of generated laser beam. Somepart of the pumping radiation (10 %) is reflected back from the uncoated crystal-air boundary. It has to be noted,that due to zig-zag propagation of the laser radiation through the slab crystal, the radiation way is not exactly
paralel to the crystallographic b-direction and the value of laser emission cross-section σe in Table 1 should bedecreased for Nd:YAP crystal.

Figure 3. Laser radiation pass by triangle crystal.

2.2. Pumping System
For active medium pumping, a quasi-CW laser diode (QCW-LD) ARR18P400 (Cutting Edge Optronics) wasused. The diode light emission area with dimensions 10 × 3 mm consists of 8 linear bars. Maximum output powerof this diode was 400 W. The diode was cooled by Peltier cooling system with the maximum cooling power 120 W.
The power supply used for this diode was LDI-928 driver with the maximum peak current 150 A. The maximum
current was set at 55 A. The length of pumping pulse was set to 250 µs which yields to the maximum pumping
energy 100 mJ. Repetition rate of the pumping diode was set on 20 Hz. The operating wavelength was tuned bychanging of laser diode temperature: for temperature 15 ◦ C laser diode operates at at 803 nm, wavelength 808 nm
corresponds with temperature 35 ◦ C. The line-width of emitted radiation was ∼ 3 nm.

2.3. Laser Oscillator
The side-pumped trigonal crystals were for most cases tested in simple semi-concave cavity. This cavity wascreated by one plan dielectric rear mirror (RM) with reflectivity 100 % for operating wavelength, and one dielectric
spherical mirror with radius of curvature larger than the length of the cavity. This mirror serves as an output
coupler (OC). The laser crystal was placed close to this mirror because of higher mode volume in this place. This
basic arrangement of the laser resonator is shown on Figure 4.
The laser operation was tested in sequence at two main Nd3+ ion laser transitions 4F3/2 → 4I11/2 , andF3/2 → 4I13/2 corresponding with emission in 1 µm and 1.3 µm spectral range, respectively. For this reason4

two different sets of various mirrors were used. First set designate for laser operation at wavelength around
1 µm consist of one flat 100 % reflecting RM and of three OC with reflectivities and 98 %, 93 % and 92 %, andcurvatures 500 mm, infinity and 100 mm, respectively. Second set designate for laser operation at wavelengtharound 1.3 µm consist also of one flat 100 % reflecting RM, and next of one OC with reflectivity 97.5 % andradius 500 mm, and of five mirrors with radius of curvature 146 mm and with reflectivities 97.5 %, 94.5 %, 92.7 %,89.2 %, and 88.1 %.

Figure 4. Basic arrangement of the laser resonator with side-pumped trigonal crystal (LD – laser pumping diode, AM –active medium, OC – laser output coupler, RM – laser rear mirror).

2.4. Saturable Absorbers
For the Q-switching at 1 µm spectral region (Nd3+ transition 4F3/2 → 4I11/2 ) the color center crystal17 LiF:F−2
was inserted into the laser resonator composed from the plane rear mirror and output coupler with reflectivity
92 % and with the radius 500 mm. The diagram of the setup is shown in Figure 5. The initial transmission of thesaturable absorber crystal was 60 % including Fresnell losses (no AR coatings were applied on this crystal).
For the Q-switching at 1.3 µm spectral region two samples of V:YAG crystals18 with different initial transmission were used. The diameter of used discs was 7 mm and the thickness was 235 µm, and 320 µm. Corresponding
initial transmission of used V:YAG crystal samples was 96 %, and 93 %. These discs were both sides polishedand AR/AR coated to obtain a minimum reflectivity on 1.08 and 1.34 µm. Crystals were fixed in adjustableair-cooled cupreous ring and placed in the laser resonator close to the resonator focus (Figure 5).

Figure 5. Arrangement of Q-switched laser with of side-pumped active medium (LD – laser pumping diode, AM – active
medium, OC – curved laser output coupler, RM – flat laser rear mirror, SA – saturable absorber).

2.5. Measuring Instruments
For measurement of the laser radiation output energy the Molectron probe J25 (voltage responsivity 8.59 V/J)
was used. To investigate the length of generated giant pulse Tektronix oscilloscope (TDS 3052, 500 MHz) withthe silicon PIN photodiode HP 4207 (for 1 µm spectral region) or InGaAs photodiode (for 1.3 µm spectral region)
was used. The spectrum of the laser radiation in 1 µm range was investigated by Oriel monochromator 77250
and it was recorded by the CCD camera EDC-1000HR (resolution 753 × 244). The spectrum of the generated
radiation in range 1.3 µm was investigated with the help of an IR wavelength meter StellarNet EPP 2000. The
mentioned CCD camera was also used for laser beam spatial structure in 1 µm spectral range.

3. RESULTS
3.1. Free-running regime
The trigonal Nd:YAG and Nd:YAP slab crystals were tested in QCW-LD side-pumped laser with simple semiconcave cavity described in section 2.3 – see Figure 6. The laser operation on two Nd3+ ion transition was proved,
emission wavelength was measured, and optimized laser resonator configuration was found for both corresponding
spectral ranges. Results are summarized in next subsections.

Figure 6. Photo of the laser oscillator arrangement with the side-pumped trigonal active medium. The laser resonator
length is 130 mm (LD – laser pumping diode, AM – active medium in holder, OC – laser output coupler, RM – laser rearmirror).

3.1.1. Laser operation at Nd3+ transition 4F3/2 → 4I11/2
Efficient generation at Nd3+ iont transition 4F3/2 → 4I11/2 was achieved for both side-pumped trigonal slab
Nd:YAG and Nd:YAP crystal. Corresponding commonly known wavelengths are 1064.2 nm (Nd:YAG) and
1079.6 nm (Nd:YAP). For each crystal proper pumping wavelength was used (see Table 1). Laser output radiation was polarized horizontally which agree with the minimal losses of the active medium Brewster faces. For
both crystals several mirrors and resonator configurations were tested and laser optimization was made. The
output characteristic for the best configuration of the output coupler and pumping is shown in Figure 7 and 8.

Figure 7. Dependence of the Nd:YAG slab triangle
output energy on pumping energy for the case of generation at λ = 1064.2 nm.

Figure 8. Dependence of the Nd:YAP slab triangle
output energy on pumping energy for the case of generation at λ = 1079.6 nm.
250

250

200

200
150

150

100

100

50

50

0
0

20

40

60

80

100

120

140

160

160

140

120

100

80

60

40

20

0

Figure 9. Nd:YAG side pumped laser beam profile 80 mm from output coupler (in horizontal plane
100 units ≡ 2.5 mm, vertical axis is ∝ intensity).

0
140

120

100

80

60

40

20

0 140

120

100

80

60

40

20

0

Figure 10. Nd:YAP side pumped laser beam profile 80 mm from output coupler (in horizontal plane
100 units ≡ 2.5 mm, vertical axis is ∝ intensity).

Analyzing the space profile of the laser beam in several distances from resonator output coupler it was foundthat both Nd:YAG and Nd:YAP laser beam parameter M 2 ∼ 32. The beam profile o Nd:YAG and Nd:YAP laser
is shown in Figure 9 and 10.
3.1.2. Laser operation at Nd3+ transition 4F3/2 → 4I13/2
In the next step, the laser resonator mirrors were changed to obtained laser emission at the 4F3/2 → 4I13/2
transition. This Nd3+ ion transition corresponds with the generation of radiation in 1.3 µm spectral range.
Corresponding wavelengths are 1318.4 nm (Nd:YAG) and 1341.6 nm (Nd:YAP). Measured spectral lines for bothmaterials are shown in Figure 11 and 12. Figure 11 shows that emission of Nd:YAG crystal contains both radiation
at wavelength 1318.4 nm and 1338.1 nm.
Also for the side-pumped Nd:YAG and Nd:YAP laser operating at transition 4F3/2 → 4I13/2 output characteristics in free-running regime were measured in dependence of laser resonator parameters. The output
characteristic for the optimal configuration of the output coupler and pumping is shown in Figure 13 and 14.

Figure 11. Spectrum of free-running Nd:YAG laser
emission corresponding to operation at Nd3+ transition
4
F3/2 → 4I13/2 .

Figure 12. Spectrum of free-running Nd:YAP laser
emission corresponding to operation at Nd3+ transition
4
F3/2 → 4I13/2 .

Figure 13. Dependence of the Nd:YAG slab triangle
output energy on pumping energy for the case of generation at λ = 1318.4 (1338.1) nm.

Figure 14. Dependence of the Nd:YAP slab triangle
output energy on pumping energy for the case of generation at λ = 1341.6 nm.

3.2. Q-switching regime
On the base of the trigonal Nd:YAG and Nd:YAP side-pumped slab crystals Q-switched laser were also realized. Generation of giant pulses in wavelength range around 1 µm and 1.3 µm were achieved. Used resonator
configuration and saturable absorbers were described in section 2.4. Results are summarized in next subsections.
3.2.1. Laser operation at Nd3+ transition 4F3/2 → 4I11/2
For Q-switching in 1 µm spectral range the above described LiF:F−
2 saturable absorber (T0 = 60 %) was inserted
into the laser resonator composed from the plane rear mirror and output coupler with reflectivity 92 % andwith the radius 500 mm. The diagram of the setup is shown in Figure 5. The stable output generation was
obtained for the input energy 100 mJ. In case of side-pumped Nd:YAG crystal, the length and the energy of thegenerated giant pulse was 36 ns (FWHM) (Figure 15) and 960 µJ, respectively. The corresponding peak power ofthe output radiation at wavelength 1064.2 ns was approximately equal 20 kW. With side-pumped Nd:YAG crystal
we have obtained giant pulse 70 ns long (FWHM) (Figure 16) with energy 2 mJ (output peak power ∼ 30 kW)
at wavelength 1079.6 ns.

Figure 15. Q-switched side-pumped Nd:YAG laser
operating at 1064.2 nm. Oscillograph of generated radiation (20 ns/div).

Figure 16. Q-switched side-pumped Nd:YAP laser
operating at 1079.6 nm. Oscillograph of generated radiation (40 ns/div).

3.2.2. Laser operation at Nd3+ transition 4F3/2 → 4I13/2
The passive Q-switching at Nd3+ transition 4F3/2 → 4I13/2 was achieved placing of the V:YAG crystal into the
160 mm long laser resonator composed from the plane rear mirror and output coupler with reflectivity 97.5 %(radius 500 mm). V:YAG crystal with initial transmission T0 = 96 % was used and giant pulse generation was
obtained for both Nd:YAG and Nd:YAP crystal. In both cases the length and the energy of the generated giant
pulse was approximately the same – 105 ns (FWHM) (see Figures 17 and 18). Generated pulse energies was alsosimilar: 460 µJ for Nd:YAG and 560 µJ for Nd:YAP. The corresponding peak power of the output radiation was
equal 4.4 kW and 5.5 kW, respectively.
With side-pumped Nd:YAG crystal we have also obtained giant pulse 72 ns long (FWHM) using thicker(T0 = 93 %) V:YAG crystal (Figure 19) with energy 530 µJ (output peak power ∼ 7.4 kW). It is important
to note than for both V:YAG crystals the emission from the Q-switched Nd:YAG laser was observed only at
wavelength 1338.1 nm like illustrates spectrum at Figure 20. This emission spectra of Nd:YAG laser Q-switchedby V:YAG crystal is done by V:YAG absorption maximum which is situated closer to 1318 nm line.

Figure 17.
Q-switched side-pumped Nd:YAG laser operating at 1338.1 nm (saturable absorber initialtransmission T0 = 96 %). Oscillograph of generated radiation (100 ns/div).

Figure 18.
Q-switched side-pumped Nd:YAP laser operating at 1341.6 nm (saturable absorber initialtransmission T0 = 96 %). Oscillograph of generated radiation (100 ns/div).

Figure 19.
Q-switched side-pumped Nd:YAG laser operating at 1338.1 nm (saturable absorber initialtransmission T0 = 93 %). Oscillograph of generated radiation (100 ns/div).

Figure 20.
Q-switched side-pumped Nd:YAG laser operating at 1338.1 nm (saturable absorber initialtransmission T0 = 93 %). Spectrum of generated radiation.

4. DISCUSSION
With the goal of obtaining higher energy in the single mid-infrared pulse from compact cheap laser system,
the laser with side-pumped trigona active medium was realized. For side pumping the quasi-CW laser diode
ARR18P400 with the maximum peak power 400 W was used. The diode had not any collimation optic and thepumping radiation was not concentrated. As an active medium trigonal Nd:YAG and Nd:YAP crystal was tested.
The laser emission at the wavelength range 1 µm or 1.3 µm in free-running regime was reached with bothside-pumped trigonal crystals. Results are summarized in Table 2. It is obvious that in free-running regime thethreshold energy Eth is mainly affected by stimulated emission cross-section σe . From a simple free-running laser
analysis it follows, that for two systems with similar pumping efficiency and laser resonator parameters (passive
and active losses) should be:
A
σeB
Eth
.
(1)
≈
B
σeA
Eth

Obtained results fulfill this condition well for both 1 µm and 1.3 µm emission range (compare last two in Table 2)an small divergencies can be explained as en effect of zig-zag laser beam propagation trough the active medium(see section 2.1.1). It means that parameters like losses and energy conversion efficiency are similar for both
crystals and the main difference is done by value of emission cross-section coefficient. Because higher emission
cross-section coefficient means lower threshold, than for operation at 1 µm spectral region Nd:YAG is betterand for operation at 1.3 µm Nd:YAP crystal should be used. The observed higher slope efficiency obtained with
Nd:YAP crystal in both spectral ranges can be explained as an effect of multimode emission from crystal withhigher volume – tested Nd:YAP trigonal crystal was about 1 mm thicker than Nd:YAG crystal.
Table 2. Results obtained with Nd3+ :YAP and Nd3+ :YAG side-pumped trigonal crystals in free-running regime.

CrystalNd:YAG
Nd:YAP
Nd:YAG
Nd:YAP

Emissionσe

Output

Eth

Slope

[nm]

[cm2 ]

coupler[mJ]

efficiency

1064.2

71 ×10−20

92.0 %

13.3

21.2 %

1079.646 ×10−20

92.0 %

20.9

34.0 %

15 ×10−20

93.5 %

36.0

15.5 %

22 ×10−20

93.5 %

31.0

20.0 %

1318.11341.6

YAP
YAG
Eth
/Eth

σeYAG /σeYAP

1.57

1.54

0.86

0.68

From the results obtained in Q-switch regime it can be summarized, lower threshold and longer lifetime it ispossible for the same maximum pump energy obtained shorter pulses with Nd:YAG active medium. Nevertheless,the results obtained with Nd:YAP crystal ware comparable and with proper pumping beam quality should bebetter.

5. CONCLUSION
Trigonal Nd:YAG and Nd:YAP slabs were tested as an active medium for diode-side-pumped laser. The laser
emission was achieved with both crystals at spectral region around 1 µm and 1.3 µm in free-running and Qswitched regime. From the comparison it follows that except for the free-running emission at 1.3 µm Nd:YAG
crystal is slightly better than Nd:YAP. Nevertheless, both systems are enough compact to be used as a tool for
medical application.

6. ACKNOWLEDGEMENTS
This research has been supported by the Grant of the Czech Ministry of Industry and Trade No. FF-P/125, andby the Czech AIP grant Development and investigations of pulsed solid state lasers No. 58.

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