Design criteria and comparison of femtosecond optical parametric oscillators based on KTiOPO<sub>4</sub> and RbTiOAsO<sub>4</sub>

D. T. Reid; M. Ebrahimzadeh; W. Sibbett

doi:10.1364/JOSAB.12.002168

Journal of the Optical Society of America B
Vol. 12,
Issue 11,
pp. 2168-2179
(1995)
•https://doi.org/10.1364/JOSAB.12.002168

Design criteria and comparison of femtosecond optical parametric oscillators based on KTiOPO₄ and RbTiOAsO₄

D. T. Reid, M. Ebrahimzadeh, and W. Sibbett

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D. T. Reid, M. Ebrahimzadeh, and W. Sibbett, "Design criteria and comparison of femtosecond optical parametric oscillators based on KTiOPO₄ and RbTiOAsO₄," J. Opt. Soc. Am. B 12, 2168-2179 (1995)

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Abstract

We describe the factors important in the design and the performance of femtosecond optical parametric oscillators. Resonator design, oscillation threshold, choice of nonlinear material, and signal output pulse duration are discussed. A detailed comparative analysis of KTiOPO₄ and its crystal isomorphs with regard to applications in femtosecond optical parametric oscillators is given, and the experimental performance of oscillators based on KTiOPO₄ and RbTiOAsO₄ is compared.

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Crystal Type	Unit Cell (Å)	Indices of refraction (λ = 1064 nm)	Transmission (μm)	Nonlinear Coefficients (pm/V)	Damage Threshold	References
KTP	a = 10.616	nx = 1.740	0.35–4.5	d₁₅₍₃₁₎ = 3.6	150 MW/cm²	46, 47, 52–55
	b = 12.814	ny = 1.748		d₂₄₍₃₂₎ = 2.0
	c = 6.404	nz = 1.830		d₃₃ = 8.3
KTA	a = 10.746	nx = 1.782	0.35–4.85	d₁₅₍₃₁₎ = 4.2	1 GW/cm²	44, 48, 51, 56
	b = 13.103	ny = 1.790		d₂₄₍₃₂₎ = 2.8
	c = 6.558	nz = 1.868		d₃₃ = 16.2
RTA	a = 10.764	nx = 1.803	0.35–5.3	d₁₅₍₃₁₎ = 4.1	400 MW/cm²	45–47, 49, 50, 57, 58
	b = 13.243	ny = 1.809		d₂₄₍₃₂₎ = 1.7
	c = 6.669	nz = 1.881		d₃₃ = 13.7
CTA	a = 10.699	nx = 1.850	0.37–5.3	d₁₅₍₃₁₎ = 3.4	–	51, 59
	b = 13.494	ny = 1.865		d₂₄₍₃₂₎ = 2.1
	c = 6.8627	nz = 1.920		d₃₃ = 18.1

Crystal Type	λ_s (λ_i) at λ_p = 800 nm (nm)	d_eff (pm/V)	Δλ_sl (FWHM) (nm mm)	Walkaway (fs/mm)		d²ϕ/dω² (at λ_s) (fs²/mm)

				Pump–Signala	Pump–Idlerb
KTP	1141	3.6	43	105	181	105
	(2675)
KTA	1175	4.2	40	117	152	103
	(2508)
RTA	1245	4.1	36	147	86	119
	(2239)
CTA	1560	3.4	52	161	30	40
	(1643)

Crystal Type	Threshold (predicted) (mW)	P_{signal (idler)}/P_pump (%)	Δτ_u (predicted) (fs)	Δτ_c (predicted) (fs)	P_u (mW)	P_c (mW)	Pump Tuning (μm)	Prism Spacing (mm)
KTP	230	15	400	38			1.12–1.25
	(60)	(6)	(450)	(43)	150	50	2.5–3.0	240
RTA	50	21	980	76			1.23–1.34
	(35)	(11)	(670)	(80)	185	100	2.1–2.43	300

Crystal Type	Unit Cell (Å)	Indices of refraction (λ = 1064 nm)	Transmission (μm)	Nonlinear Coefficients (pm/V)	Damage Threshold	References
KTP	a = 10.616	nx = 1.740	0.35–4.5	d₁₅₍₃₁₎ = 3.6	150 MW/cm²	46, 47, 52–55
	b = 12.814	ny = 1.748		d₂₄₍₃₂₎ = 2.0
	c = 6.404	nz = 1.830		d₃₃ = 8.3
KTA	a = 10.746	nx = 1.782	0.35–4.85	d₁₅₍₃₁₎ = 4.2	1 GW/cm²	44, 48, 51, 56
	b = 13.103	ny = 1.790		d₂₄₍₃₂₎ = 2.8
	c = 6.558	nz = 1.868		d₃₃ = 16.2
RTA	a = 10.764	nx = 1.803	0.35–5.3	d₁₅₍₃₁₎ = 4.1	400 MW/cm²	45–47, 49, 50, 57, 58
	b = 13.243	ny = 1.809		d₂₄₍₃₂₎ = 1.7
	c = 6.669	nz = 1.881		d₃₃ = 13.7
CTA	a = 10.699	nx = 1.850	0.37–5.3	d₁₅₍₃₁₎ = 3.4	–	51, 59
	b = 13.494	ny = 1.865		d₂₄₍₃₂₎ = 2.1
	c = 6.8627	nz = 1.920		d₃₃ = 18.1

Crystal Type	λ_s (λ_i) at λ_p = 800 nm (nm)	d_eff (pm/V)	Δλ_sl (FWHM) (nm mm)	Walkaway (fs/mm)		d²ϕ/dω² (at λ_s) (fs²/mm)

				Pump–Signala	Pump–Idlerb
KTP	1141	3.6	43	105	181	105
	(2675)
KTA	1175	4.2	40	117	152	103
	(2508)
RTA	1245	4.1	36	147	86	119
	(2239)
CTA	1560	3.4	52	161	30	40
	(1643)

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Journal of the Optical Society of America B